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Artículos de revistas sobre el tema "Waves/low frequency currents interractions"

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Publicado: 11 de enero de 2025
Última modificación: 31 de julio de 2025

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1

Elgar, Steve, and Britt Raubenheimer. "Field Evidence of Inverse Energy Cascades in the Surfzone." Journal of Physical Oceanography 50, no. 8 (2020): 2315–21. http://dx.doi.org/10.1175/jpo-d-19-0327.1.

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AbstractLow-frequency currents and eddies transport sediment, pathogens, larvae, and heat along the coast and between the shoreline and deeper water. Here, low-frequency currents (between 0.1 and 4.0 mHz) observed in shallow surfzone waters for 120 days during a wide range of wave conditions are compared with theories for generation by instabilities of alongshore currents, by ocean-wave-induced sea surface modulations, and by a nonlinear transfer of energy from breaking waves to low-frequency motions via a two-dimensional inverse energy cascade. For these data, the low-frequency currents are n
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2

Fioranelli, Massimo, Maria Grazia Roccia, Aroonkumar Beesham, Dana Flavin, M. Ghaeni, and Faissal AZIZ. "A model for considering effects of extremely low frequency electromagnetic fields on quail embryonic cells." AIMS Biophysics 9, no. 3 (2022): 198–207. http://dx.doi.org/10.3934/biophy.2022017.

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<abstract> <p>Previous experiments have shown that extremely low frequency electromagnetic fields could cause serious effects on the evolution of cells. We propose a mathematical model which confirms those results. In our model, electromagnetic waves could cause the motions of ions and charges and the emergence of some currents around and in the interior of cells. These currents produce some waves which interact with the DNAs and remove or attach some repressors. Consequently, some genes could be turned on or off, and cells could obtain some properties or lose them. The frequency o
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3

Johnson, E. R. "Boundary Currents, Free Currents and Dissipation in the Low-Frequency Scattering of Shelf Waves." Journal of Physical Oceanography 19, no. 9 (1989): 1291–300. http://dx.doi.org/10.1175/1520-0485(1989)019<1291:bcfcad>2.0.co;2.

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4

Torres, Hector S., Patrice Klein, Jinbo Wang, et al. "Wind work at the air-sea interface: a modeling study in anticipation of future space missions." Geoscientific Model Development 15, no. 21 (2022): 8041–58. http://dx.doi.org/10.5194/gmd-15-8041-2022.

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Abstract. Wind work at the air-sea interface is the transfer of kinetic energy between the ocean and the atmosphere and, as such, is an important part of the ocean-atmosphere coupled system. Wind work is defined as the scalar product of ocean wind stress and surface current, with each of these two variables spanning, in this study, a broad range of spatial and temporal scales, from 10 km to more than 3000 km and hours to months. These characteristics emphasize wind work's multiscale nature. In the absence of appropriate global observations, our study makes use of a new global, coupled ocean-at
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5

Berthelier, A., J. C. Cerisier, J. J. Berthelikr, and L. Rnzeau. "Low-frequency magnetic turbulence in the high-latitude topside ionosphere: low-frequency waves or field-aligned currents." Journal of Atmospheric and Terrestrial Physics 53, no. 3-4 (1991): 333–41. http://dx.doi.org/10.1016/0021-9169(91)90117-p.

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6

Matsumoto, Michio, Kazuo Sakai, and Satoshi Takeuchi. "Low Frequency Waves with Azimuthal Currents in a Weakly Magnetized Positive Column." Journal of the Physical Society of Japan 61, no. 3 (1992): 844–48. http://dx.doi.org/10.1143/jpsj.61.844.

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7

Yao, S. T., Q. Q. Shi, Q. G. Zong, et al. "Low-frequency Whistler Waves Modulate Electrons and Generate Higher-frequency Whistler Waves in the Solar Wind." Astrophysical Journal 923, no. 2 (2021): 216. http://dx.doi.org/10.3847/1538-4357/ac2e97.

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Abstract The role of whistler-mode waves in the solar wind and the relationship between their electromagnetic fields and charged particles is a fundamental question in space physics. Using high-temporal-resolution electromagnetic field and plasma data from the Magnetospheric MultiScale spacecraft, we report observations of low-frequency whistler waves and associated electromagnetic fields and particle behavior in the Earth’s foreshock. The frequency of these whistler waves is close to half the lower-hybrid frequency (∼2 Hz), with their wavelength close to the ion gyroradius. The electron bulk
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8

Deguchi, Ichiro, Mamoru Arita, and Takumi Yoshii. "FLUCTUATION OF RIP CURRENT MEASURED IN SHALLOW WATER REGION WITH SMALL TIDAL RANGE." Coastal Engineering Proceedings 1, no. 32 (2011): 44. http://dx.doi.org/10.9753/icce.v32.currents.44.

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Disappearance and formation processes of rip channel are discussed based on the field measurements of wave height, current velocity, bottom topography and flow pattern of near-shore current. Sudden increase in wave height together with the change in the wave direction took place during a half day caused these phenomena and rip current rose and fell according to the transition of the bottom topography. Furthermore, flow pattern of rip current was not steady but transformed itself with low frequency fluctuations of the period of few minutes. It is found that such low frequency fluctuations are c
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9

Stepanov, D. V., and V. V. Novotryasov. "Sub-inertial modulation of nonlinear Kelvin waves in the coastal zone." Nonlinear Processes in Geophysics 20, no. 3 (2013): 357–64. http://dx.doi.org/10.5194/npg-20-357-2013.

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Abstract. Observational evidence is presented for interaction between nonlinear internal Kelvin waves at the ωt,i (where the ωt is the semidiurnal frequency and the ωi is the inertial frequency) and random oscillations of the background coastal current at the sub-inertial Ω frequency in the Japan/East Sea. Enhanced coastal currents at the sum ω+ and difference ω-frequencies ω±=ωt,i ± Ω have properties of propagating Kelvin waves, which suggests permanent energy exchange from the sub-inertial band to the mesoscale ω± band. This interaction may be responsible for a greater-than-predicted intensi
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10

Van Dongeren, Ap, Ryan Lowe, Andrew Pomeroy, et al. "MODELLING INFRAGRAVITY WAVES AND CURRENTS ACROSS A FRINGING CORAL REEF." Coastal Engineering Proceedings 1, no. 33 (2012): 29. http://dx.doi.org/10.9753/icce.v33.currents.29.

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Low-frequency (infragravity) wave dynamics on a fringing coral reef were investigated using the numerical model XBeach (Roelvink et al, 2009). First, the skill of the one-dimensional model was evaluated based on its predictions of short waves (0.04-0.2 Hz), infragravity waves (0.004-0.04 Hz) and water level measurements (tidal and wave setup) obtained during a 2009 field study at Ningaloo Reef in Western Australia. The model calibration was sensitive to friction coefficients for short waves and current / infragravity bed friction, which were assumed independent in this model study. The infragr
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11

Lamy, L., P. Zarka, B. Cecconi, et al. "The low-frequency source of Saturn’s kilometric radiation." Science 362, no. 6410 (2018): eaat2027. http://dx.doi.org/10.1126/science.aat2027.

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Understanding how auroral radio emissions are produced by magnetized bodies requires in situ measurements within their source region. Saturn’s kilometric radiation (SKR) has been widely used as a remote proxy of Saturn’s magnetosphere. We present wave and plasma measurements from the Cassini spacecraft during its ring-grazing high-inclination orbits, which passed three times through the high-altitude SKR emission region. Northern dawn-side, narrow-banded radio sources were encountered at frequencies of 10 to 20 kilohertz, within regions of upward currents mapping to the ultraviolet auroral ova
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12

Sanchez-Arriaga, G., and J. R. Sanmartin. "Fast magnetosonic wave excitation by an array of wires with time-modulated currents." Annales Geophysicae 28, no. 2 (2010): 577–86. http://dx.doi.org/10.5194/angeo-28-577-2010.

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Abstract. The excitation of Fast Magnetosonic (FMS) waves by a cylindrical array of parallel tethers carrying time-modulated current is discussed. The tethers would fly vertical in the equatorial plane, which is perpendicular to the geomagnetic field when its tilt is ignored, and would be stabilized by the gravity gradient. The tether array would radiate a single FMS wave. In the time-dependent background made of geomagnetic field plus radiated wave, plasma FMS perturbations are excited in the array vicinity through a parametric instability. The growth rate is estimated by truncating the evolu
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13

Richter, I., C. Koenders, H. U. Auster, et al. "Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko." Annales Geophysicae 33, no. 8 (2015): 1031–36. http://dx.doi.org/10.5194/angeo-33-1031-2015.

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Abstract. We report on magnetic field measurements made in the innermost coma of 67P/Churyumov-Gerasimenko in its low-activity state. Quasi-coherent, large-amplitude (δ B/B ~ 1), compressional magnetic field oscillations at ~ 40 mHz dominate the immediate plasma environment of the nucleus. This differs from previously studied cometary interaction regions where waves at the cometary ion gyro-frequencies are the main feature. Thus classical pickup-ion-driven instabilities are unable to explain the observations. We propose a cross-field current instability associated with newborn cometary ion cur
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14

Guerrero, Anlly Melissa, Luis Otero, Silvio Ospino, and Jairo Cueto. "Interactions between Hydrodynamic Forcing, Suspended Sediment Transport, and Morphology in a Microtidal Intermediate-Dissipative Beach." Journal of Marine Science and Engineering 12, no. 7 (2024): 1141. http://dx.doi.org/10.3390/jmse12071141.

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This study aims to investigate the hydrodynamic-morphological interactions on a microtidal intermediate-dissipative beach under low to moderate wave energy conditions using field measurements during two climatic seasons. The separate contributions of currents, sea-swell waves, and infragravity waves to high- and low-frequency sediment fluxes were analyzed. The infragravity wave energy was more relevant near the swash zone than in other areas. Although the currents are the primary suspended sediment transport mechanism, the results suggest that the waves are an important driver of sediment susp
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15

Sogut, Erdinc, and Ali Farhadzadeh. "ALONGSHORE VARIABILITY OF COASTAL MORHODYNAMICS IN EASTERN LAKE ERIE DUE TO LOW FREQUENCY OSCILLATIONS OF LAKE LEVEL." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 23. http://dx.doi.org/10.9753/icce.v36.sediment.23.

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Lake Erie has the fourth largest surface area, shallowest water depth and smallest volume among the five Great Lakes in North America (NOAA). The dominant wind direction over Lake Erie’s is southwest-northeast, along the lake’s longitudinal axis. The atmospheric and water level data of the lake demonstrate that high wind and moving pressure systems can result in high storm surge of up to 3 m on the eastern end of the lake and significant drop in the water level at the western end of the lake Due to its shallow depth, such a water level gradient can trigger unique post-storm free water-leve
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16

Koshevaya, S., N. Makarets, V. Grimalsky, A. Kotsarenko, and R. Perez Enríquez. "Spectrum of the seismic-electromagnetic and acoustic waves caused by seismic and volcano activity." Natural Hazards and Earth System Sciences 5, no. 2 (2005): 203–9. http://dx.doi.org/10.5194/nhess-5-203-2005.

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Abstract. Modeling of the spectrum of the seismo-electromagnetic and acoustic waves, caused by seismic and volcanic activity, has been done. This spectrum includes the Electromagnetic Emission (EME, due to fracturing piezoelectrics in rocks) and the Acoustic Emission (AE, caused by the excitation and the nonlinear passage of acoustic waves through the Earth's crust, the atmosphere, and the ionosphere). The investigated mechanism of the EME uses the model of fracturing and the crack motion. For its analysis, we consider a piezoelectric crystal under mechanical stresses, which cause the uniform
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17

Kolodziejczyk, Nicolas, José Ochoa, Julio Candela, and Julio Sheinbaum. "Deep Currents in the Bay of Campeche." Journal of Physical Oceanography 41, no. 10 (2011): 1902–20. http://dx.doi.org/10.1175/2011jpo4526.1.

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Abstract Data from five moorings deployed in the Bay of Campeche during November 2007–July 2008 are used to analyze subinertial motions of waters below 1000-m depth. To the authors’ knowledge, this is the first time such a comprehensive observational program of direct deep-current measurements has been carried out in the region. The mean currents are in agreement with a cyclonic circulation at 1000-m depth; however, this cyclonic pattern is not so clearly defined at deeper levels. Only at the deepest mooring, located at 3500-m depth, are the mean currents uniform all the way to the bottom. Ove
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18

Lepidi, S., L. Cafarella, P. Francia, A. Meloni, P. Palangio, and J. J. Schott. "Low frequency geomagnetic field variations at Dome C (Antarctica)." Annales Geophysicae 21, no. 4 (2003): 923–32. http://dx.doi.org/10.5194/angeo-21-923-2003.

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Abstract. We conduct an analysis of the geomagnetic field variations recorded at the new Antarctic station Dome C, located very close to the geomagnetic pole, which has been operating for approximately one month during the 1999–2000 campaign. We also perform a comparison with simultaneous measurements at the Italian Antarctic station Terra Nova Bay, in order to investigate the spatial extension of the phenomena observed at very high latitude. Our results show that between the two stations the daily variation is similar and the fluctuations with f ~ 1 mHz are coherent, provided that in both cas
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19

Kato, Y., S. Harisaki, W. Kubo, Y. Fujimura, and K. Iwahara. "Initial Experimental Results on Ion Cyclotron Resonance Heating Selectively Mixed Low Z Ions to Enhance Production Efficiency of Multicharged Ions on Electron Cyclotron Resonance Ion Source." Journal of Physics: Conference Series 2743, no. 1 (2024): 012002. http://dx.doi.org/10.1088/1742-6596/2743/1/012002.

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Abstract According to the accessibility conditions of wave propagation in the magnetized plasma of an electron cyclotron resonance (ECR) ion source (ECRIS), it is speculated that the essential factor that determines the limitations in the multiply charged ion currents is the left-hand polarization wave cutoff (L-cutoff). It is necessary to overcome this limitation, we proposed the introduction of ion cyclotron resonance (ICR) or lower hybrid resonance (LHR) by lower frequency waves. We conduct heating low-mass ions selectively in enhanced producing multiply charged ion by mixing low-mass eleme
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20

Inacio, Malmonge Martin. "STUDY OF IONOSPHERIC IONIZATION USING EXTREMELY LOW FREQUENCY (ELF) MEASURES IN SÃO JOSÉ DOS CAMPOS, BRAZIL REGION." GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES 5, no. 11 (2018): 6–11. https://doi.org/10.5281/zenodo.1477803.

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In a recent theoretical article, the author described a possible process of generating electromagnetic waves in the range of (1-12) Hz caused by diamagnetic currents originated by heat in ionosphere through high frequency waves (HF). The origin of the HF waves that reach the ionosphere can be sent from the Earth&rsquo;s surface or even directly solar phenomena. Through a SpectranNF-5035 detector, developed by German Aaronia with high sensitivity (1 nV) nanoVolt in a range of (1-12) Hz and low sampling time (5 ms), with specific external ELF antennae was possible to measure these waves and dete
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21

Li, Jiemeihui, Yang Shi, Yixin Yang, and Xiaodong Huang. "Noise of Internal Solitary Waves Measured by Mooring-Mounted Hydrophone Array in the South China Sea." Journal of Marine Science and Engineering 10, no. 2 (2022): 222. http://dx.doi.org/10.3390/jmse10020222.

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Internal solitary waves in the South China Sea have attracted attention because of their large amplitude and high rate of occurrence. Internal solitary waves have a substantial influence on underwater sound propagation and ambient noise. However, there have seldom been reports on the noise they cause. In this paper, we conducted an internal solitary waves cooperative observation experiment in the South China Sea in 2016. We analyzed the temperature, flow velocity and noise changes induced by internal solitary waves. The power spectra of noise generated by internal solitary waves at frequencies
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22

Teigen, P., and A. Naess. "Extreme Response of Floating Structures in Combined Wind and Waves." Journal of Offshore Mechanics and Arctic Engineering 125, no. 2 (2003): 87–93. http://dx.doi.org/10.1115/1.1554699.

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The paper highlights the problem of evaluating the extreme surge response of a floating, deep water structure subjected to stochastic loading from concurrent wind and waves. Additional load effects associated with ocean currents are also briefly discussed. Both long-crested and short-crested waves are considered, whereas the wind field is assumed to be unidirectional. The probability density function (PDF) of the combined wave frequency and low frequency response of the structure, due to waves, is calculated by an eigenvalue analysis and convoluted with the corresponding PDF from the wind load
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23

Hernandez-Gonzalez, Nieves G., Juan Montiel-Caminos, Javier Sosa, and Juan A. Montiel-Nelson. "An Edge Computing Application of Fundamental Frequency Extraction for Ocean Currents and Waves." Sensors 24, no. 5 (2024): 1358. http://dx.doi.org/10.3390/s24051358.

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This paper describes the design and optimization of a smart algorithm based on artificial intelligence to increase the accuracy of an ocean water current meter. The main purpose of water current meters is to obtain the fundamental frequency of the ocean waves and currents. The limiting factor in those underwater applications is power consumption and that is the reason to use only ultra-low power microcontrollers. On the other hand, nowadays extraction algorithms assume that the processed signal is defined in a fixed bandwidth. In our approach, belonging to the edge computing research area, we
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24

Zhao, Xing, Bin Tu, Mengyao Li, et al. "Switchable counterion gradients around charged metallic nanoparticles enable reception of radio waves." Science Advances 4, no. 10 (2018): eaau3546. http://dx.doi.org/10.1126/sciadv.aau3546.

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Mechanically flexible, easy-to-process, and environmentally benign materials capable of current rectification are interesting alternatives to “hard” silicon-based devices. Among these materials are metallic/charged-organic nanoparticles in which electronic currents though metal cores are modulated by the gradients of counterions surrounding the organic ligands. Although layers of oppositely charged particles can respond to both electronic and chemical signals and can function even under significant mechanical deformation, the rectification ratios of these “chemoelectronic” elements have been,
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25

Cienfuegos, Rodrigo, L. Duarte, L. Suarez, and P. A. Catalán. "NUMERICAL COMPUTATION OF INFRAGRAVITY WAVE DYNAMICS AND VELOCITY PROFILES USING A FULLY NONLINEAR BOUSSINESQ MODEL." Coastal Engineering Proceedings 1, no. 32 (2011): 48. http://dx.doi.org/10.9753/icce.v32.currents.48.

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We present experimental and numerical analysis of nonlinear processes responsible for generating infragravity waves&#x0D; in the nearshore. We provide new experimental data on random wave propagation and associated velocity profiles in&#x0D; the shoaling and surf zones of a very mild slope beach. We analyze low frequency wave generation mechanisms and&#x0D; dynamics along the beach and examine in detail the ability of the fully nonlinear Boussinesq- type model SERR1D&#x0D; (Cienfuegos et al., 2010) to reproduce the complex dynamics of high frequency wave propagation and energy transfer&#x0D; m
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26

Holden, C. J. "Observations of low-frequency currents and continental shelf waves along the west coast of South Africa." South African Journal of Marine Science 5, no. 1 (1987): 197–208. http://dx.doi.org/10.2989/025776187784522360.

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27

Yao, Y., and I. Parker. "Ca2+ influx modulation of temporal and spatial patterns of inositol trisphosphate‐mediated Ca2+ liberation in Xenopus oocytes." Journal of Physiology 476, no. 1 (1994): 17–28. http://dx.doi.org/10.1113/jphysiol.1994.sp020108.

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Inositol 1,4,5‐trisphosphate (InsP3) functions as a second messenger by liberating intracellular Ca2+ and by promoting influx of extracellular Ca2+. We examined the effects of Ca2+ influx on the temporal and spatial patterns of intracellular Ca2+ liberation in Xenopus oocytes by fluorescence imaging of cytosolic free Ca2+ together with voltage clamp recording of Ca(2+)‐activated Cl‐ currents. Oocytes were injected with a poorly metabolized InsP3 analogue (3‐F‐InsP3; see Introduction) to induce sustained activation of InsP3 signalling, and Ca2+ influx was controlled by applying voltage steps to
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28

Liu, Yonggang, Robert H. Weisberg, Clifford R. Merz, Sage Lichtenwalner, and Gary J. Kirkpatrick. "HF Radar Performance in a Low-Energy Environment: CODAR SeaSonde Experience on the West Florida Shelf*." Journal of Atmospheric and Oceanic Technology 27, no. 10 (2010): 1689–710. http://dx.doi.org/10.1175/2010jtecho720.1.

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Abstract Three long-range (5 MHz) Coastal Ocean Dynamics Application Radar (CODAR) SeaSonde HF radars overlooking an array of as many as eight moored acoustic Doppler current profilers (ADCPs) have operated on the West Florida Shelf since September 2003 for the purpose of observing the coastal ocean currents. HF radar performance on this low-energy (currents and waves) continental shelf is evaluated with respect to data returns, the rms differences between the HF radar and the ADCP radial currents, bearing offsets, and radial velocity uncertainties. Possible environmental factors affecting the
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29

Schlosser, Tamara L., Nicole L. Jones, Cynthia E. Bluteau, Matthew H. Alford, Gregory N. Ivey, and Andrew J. Lucas. "Generation and Propagation of Near-Inertial Waves in a Baroclinic Current on the Tasmanian Shelf." Journal of Physical Oceanography 49, no. 10 (2019): 2653–67. http://dx.doi.org/10.1175/jpo-d-18-0208.1.

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AbstractNear-inertial waves (NIWs) are often an energetic component of the internal wave field on windy continental shelves. The effect of baroclinic geostrophic currents, which introduce both relative vorticity and baroclinicity, on NIWs is not well understood. Relative vorticity affects the resonant frequency feff, while both relative vorticity and baroclinicity modify the minimum wave frequency of freely propagating waves ωmin. On a windy and narrow shelf, we observed wind-forced oscillations that generated NIWs where feff was less than the Coriolis frequency f. If everywhere feff &gt; f th
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30

Pang, Guoliang, Chengyu Wan, Liuyang Sui, et al. "Dynamic Response Simulation for a Novel Single-Point Mooring Gravity-Type Deep-Water Net Cage Under Irregular Wave and Current." Applied Sciences 15, no. 3 (2025): 1570. https://doi.org/10.3390/app15031570.

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This study investigated the structural response characteristics of a novel single-point mooring gravity-type deep-water (SPM-GDW) net cage under irregular waves and currents. A hydrodynamic numerical model of the cage was created and validated through model experiments. Based on the validated cage model, the structural response characteristics such as cage motion response, mooring line forces, and floating collar stress were studied, considering the actual operating conditions in the target sea area. The response time history curves, wave height time history, and spectral density statistics we
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31

Pilipenko, V. A., D. Yu Klimushkin, P. N. Mager, M. J. Engebretson, and O. V. Kozyreva. "Generation of resonant Alfvén waves in the auroral oval." Annales Geophysicae 34, no. 2 (2016): 241–48. http://dx.doi.org/10.5194/angeo-34-241-2016.

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Abstract. Many independent observations have shown that resonant field line Pc5 pulsations (typical periods of about several minutes) are preferably excited inside the auroral oval. Consideration of the most evident interpretation schemes shows that there is no simple explanation of this effect. Here we consider theoretically the generation of toroidal Pc5 Alfvén waves by fluctuating magnetospheric field-aligned currents. It is shown that the Alfvén wave latitudinal structure has the same features as in the case of the classical field line resonance driven by external sources: a peak localized
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32

Robles, Luis, and Mario A. Ruggero. "Mechanics of the Mammalian Cochlea." Physiological Reviews 81, no. 3 (2001): 1305–52. http://dx.doi.org/10.1152/physrev.2001.81.3.1305.

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In mammals, environmental sounds stimulate the auditory receptor, the cochlea, via vibrations of the stapes, the innermost of the middle ear ossicles. These vibrations produce displacement waves that travel on the elongated and spirally wound basilar membrane (BM). As they travel, waves grow in amplitude, reaching a maximum and then dying out. The location of maximum BM motion is a function of stimulus frequency, with high-frequency waves being localized to the “base” of the cochlea (near the stapes) and low-frequency waves approaching the “apex” of the cochlea. Thus each cochlear site has a c
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33

Cuperman, S., C. Bruma, and K. Komoshvili. "Non-inductive current drive via helicity injection by Alfvén waves in low-aspect-ratio tokamaks." Journal of Plasma Physics 56, no. 1 (1996): 149–74. http://dx.doi.org/10.1017/s0022377800019152.

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A theoretical investigation of radio-frequency (RF) current drive via helicity injection in low aspect ratio tokamaks is carried out. A current-carrying cylindrical plasma surrounded by a helical sheet-current antenna and situated inside a perfectly conducting shell is considered. Toroidal features of low-aspect-ratio tokamaks are simulated by incorporating the following effects: (i) arbitrarily small aspect ratio, Ro/a ≡1/∈; (ii) strongly sheared equilibrium magnetic field; and (iii) relatively large poloidal component of the equilibrium magnetic field. This study concentrates on the Alfvén c
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34

Shevchenko, Georgy V., Alexander B. Rabinovich, and Richard E. Thomson. "Sea-Ice Drift on the Northeastern Shelf of Sakhalin Island." Journal of Physical Oceanography 34, no. 11 (2004): 2470–91. http://dx.doi.org/10.1175/jpo2632.1.

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Abstract Ice-drift velocity records from coastal radar stations, combined with data from moored current meters and coastal wind stations, are used to examine sea-ice motion off the northeastern coast of Sakhalin Island in the Sea of Okhotsk. Ice motion is shown to be governed primarily by diurnal tidal currents and wind-induced drift, which explain 92%–95% of the total ice-drift variance. Diurnal tidal motions predominate off the northern Sakhalin coast, accounting for 65%–80% of the variance, while low-frequency wind-induced motions prevail off the south-central coast, accounting for over 91%
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35

Uvarov, Vladimir. "Electromagnetic-Deformation Response of the Crust." E3S Web of Conferences 62 (2018): 03003. http://dx.doi.org/10.1051/e3sconf/20186203003.

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The analysis of mechanic-electromagnetic effects of the Earth’s crust made it possible to distinguish the relation of rock induced polarization with its deformation. On the basis of these relations, their generalized description is made. It is shown that, although the Earth’s crust is an energy-saturated structure in a critical state, but owing to electromagnetic properties, it is not a medium in which electromagnetic oscillations can be generated in the low-frequency region. At the same time, the Earth’s crust is favourable environment for the occurrences of seismo-acoustic oscillations. It i
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36

Sciffer, M. D., C. L. Waters, and F. W. Menk. "Propagation of ULF waves through the ionosphere: Inductive effect for oblique magnetic fields." Annales Geophysicae 22, no. 4 (2004): 1155–69. http://dx.doi.org/10.5194/angeo-22-1155-2004.

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Abstract. Solutions for ultra-low frequency (ULF) wave fields in the frequency range 1–100mHz that interact with the Earth's ionosphere in the presence of oblique background magnetic fields are described. Analytic expressions for the electric and magnetic wave fields in the magnetosphere, ionosphere and atmosphere are derived within the context of an inductive ionosphere. The inductive shielding effect (ISE) arises from the generation of an "inductive" rotational current by the induced part of the divergent electric field in the ionosphere which reduces the wave amplitude detected on the groun
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37

Anh, Vu Tuan. "ASSESSMENT OF THE IMPACT OF BREAKWATER ON EROSION-DEPOSITION PROCESSES IN TAM QUAN RIVER MOUTH, BINH DINH PROVINCE." Tạp chí Khoa học và Công nghệ Biển 17, no. 4 (2018): 433–44. http://dx.doi.org/10.15625/1859-3097/17/4/11053.

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After the establishment of breakwater at Tam Quan river mouth in 2009, this area has been deposited quickly, especially in the rainy season (coinciding with northeast monsoon). The processes of litho-hydrodynamics and erosion-deposition change clearly over seasons. In the rainy season (September to December) prevailing wind directions are NE, NNE, N and NW. Most wind speeds range from level 2 to level 5. Waves generated by NE, N winds have the most impact on the Tam Quan river mouth. During propagation into the channel the waves reduce rapidly and tend to push the bed material from the sea to
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38

KUO, S. P. "Generation of extra and very low-frequency (ELF/VLF) radiation by ionospheric electrojet modulation using high-frequency (HF) heating waves." Journal of Plasma Physics 68, no. 4 (2002): 267–84. http://dx.doi.org/10.1017/s0022377802001964.

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Extra and very low-frequency (ELF/VLF) wave generation by modulated polar electrojet currents is studied numerically. Through Ohmic heating by the amplitude-modulated high-frequency heating wave, the conductivity and thus the current of the electrojet are modulated accordingly to set up the ionospheric antenna current. Stimulated thermal instability, which can further enhance the electrojet current modulation, is studied. It is first analysed analytically to determine the threshold heating power for its excitation. The nonlinear evolutions of the generated ELF/VLF waves enhanced by the instabi
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39

Pinkel, Robert. "Advection, Phase Distortion, and the Frequency Spectrum of Finescale Fields in the Sea." Journal of Physical Oceanography 38, no. 2 (2008): 291–313. http://dx.doi.org/10.1175/2007jpo3559.1.

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Abstract Continuous depth–time measurements of upper-ocean velocity are used to estimate the wavenumber–frequency spectrum of shear. A fundamental characteristic of these spectra is that the frequency bandwidth increases linearly with increasing wavenumber magnitude. This can be interpreted as the signature of Doppler shifting of the observations by time-changing “background” currents as well as by instrument motion. Here, the hypothesis is posed that the apparently continuous wavenumber–frequency spectrum of oceanic shear results from the advective “smearing” of discrete spectral lines. In th
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40

Schlicht, Anja. "GRACE Accelerometers Sensitive to Ionosphere Plasma Waves: Similarities between Twangs and Whistlers." Geosciences 12, no. 6 (2022): 228. http://dx.doi.org/10.3390/geosciences12060228.

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Electrostatic space accelerometers are high-precision instruments used in gravity and magnetic fields and in fundamental physics missions. From their first use in space, these instruments show disturbances around the read-out frequency. In recent missions like Swarm and GRACE-FO, these instruments are seriously compromised. Their capability cannot be fully exploited or, in the worst case, not used for science data processing at all. We currently neither understand the mechanism nor the cause of the disturbance. For that reason, every correlation, direct or indirect, between signatures in the a
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41

Thomas, Leif N. "On the effects of frontogenetic strain on symmetric instability and inertia–gravity waves." Journal of Fluid Mechanics 711 (September 20, 2012): 620–40. http://dx.doi.org/10.1017/jfm.2012.416.

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AbstractThe dynamics of symmetric instability and two-dimensional inertia–gravity waves in a baroclinic geostrophic flow undergoing frontogenesis is analysed. A frontogenetic strain associated with a balanced deformation field drives an ageostrophic circulation and temporal variations in the basic state that significantly affect the properties of perturbations to the background flow. For stable stratification, perturbations to the basic state result in symmetric instability or inertia–gravity waves, depending on the sign of the Ertel potential vorticity and the magnitude of the Richardson numb
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42

Brown, Jaclyn N., J. Stuart Godfrey, and Susan E. Wijffels. "Nonlinear Effects of Tropical Instability Waves on the Equatorial Pacific Circulation." Journal of Physical Oceanography 40, no. 2 (2010): 381–93. http://dx.doi.org/10.1175/2009jpo3963.1.

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Abstract In a numerical model of the equatorial Pacific Ocean, the ∼20-day period tropical instability waves, excited in the eastern half of the domain, are found to damp the strong zonal mean currents. The waves generate large, nonlinear, advection terms in the momentum balance, change the vorticity balance, and thus modulate the low-frequency state. The authors explore whether the effect of tropical instability waves on the background flow can instead be adequately parameterized by a constant-coefficient Laplacian friction scheme. On annual mean, a Laplacian friction coefficient that varies
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43

Li, Jianke, and Allan J. Clarke. "Coastline Direction, Interannual Flow, and the Strong El Niño Currents along Australia's Nearly Zonal Southern Coast." Journal of Physical Oceanography 34, no. 11 (2004): 2373–81. http://dx.doi.org/10.1175/jpo2645.1.

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Abstract The western equatorial Pacific Ocean El Niño signal leaks through the gappy western equatorial Pacific Ocean boundary to the western and southern coasts of Australia. Ocean Topography Experiment (TOPEX)/Poseidon sea level data and coastal tide gauge measurements show that off the northwest coast the low-frequency signal propagates westward as large-scale Rossby waves. However, along the nearly zonal southern coast, particle displacements are nearly zonal near the coast and experience no planetary vorticity change. As a consequence, the Rossby wave mechanism fails, and theory suggests
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44

Simsek, Omer Sahin. "Integration of Radiofrequency-Sensitive Light Indicators Into Short-Wave Diathermy Devices to Prevent Incomplete Treatments." Journal of Clinical Engineering 50, no. 2 (2025): 77–80. https://doi.org/10.1097/jce.0000000000000699.

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This study addresses the design and implementation of a radiofrequency-sensitive light indicator aimed at enhancing the clinical effectiveness of short-wave diathermy (SWD) devices. Short-wave diathermy devices are used in the treatment of various pathologies, such as pain control, osteoarthritis, muscle spasms, and fibromyalgia, by generating heat through high-frequency electromagnetic currents. However, current devices lack a mechanism that verifies in real time whether radiofrequency waves are being transmitted to the patient during treatment. In this study, a low-cost and practical circuit
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45

Archetti, Renata, and Maria Gabriella Gaeta. "WAVE RUN-UP OBSERVATION AND 2DV NUMERICAL INVESTIGATION ON BEACHES PROTECTED BY STRUCTURES." Coastal Engineering Proceedings 1, no. 33 (2012): 20. http://dx.doi.org/10.9753/icce.v33.currents.20.

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The main parameter for the assessment of coastal vulnerability and sediment transport is the wave run-up on the beach, defining the limit of maximum flooding, but also hydrodynamic properties in the Swash Zone (SZ) are trivial for the comprehension of hydro-morphodynamic processes. Several studies have been carried out on the SZ but few literature is still available on the run-up and on SZ flows on beaches protected by Low Crested Structures (LCSs), where flow motion is driven by a combination of low frequency infra-gravity waves and incident waves. In presence of breakwaters, swash incident w
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46

Kirincich, Anthony. "Improved Detection of the First-Order Region for Direction-Finding HF Radars Using Image Processing Techniques." Journal of Atmospheric and Oceanic Technology 34, no. 8 (2017): 1679–91. http://dx.doi.org/10.1175/jtech-d-16-0162.1.

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AbstractFor direction-finding high-frequency (HF) radar systems, the correct separation of backscattered spectral energy due to Bragg resonant waves from that due to more complex double-scattering represents a critical first step toward attaining accurate estimates of surface currents from the range-dependent radar backscatter. Existing methods to identify this “first order” region of the spectra, generally sufficient for lower-frequency radars and low-velocity or low-surface gravity wave conditions, are more likely to fail in higher-frequency systems or locations with more variable current, w
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47

Deng, Fangxiong, Xiaofei Xu, Yang Wang, Zhiyong Yu, and Can Jiang. "Investigation of the Effect of Coil Current Waveform on Electromagnetic Tube Forming." Metals 15, no. 4 (2025): 367. https://doi.org/10.3390/met15040367.

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The coil current frequency and waveform have a great impact on the forming performance of the workpiece in electromagnetic forming. However, existing research is mostly limited to analyzing the influence of either frequency or waveform on the forming outcome independently, which makes it challenging to fully reveal the intrinsic relationship between current parameters and forming results. In this work, three discharge circuit structures are developed to generate different coil currents composed of various frequencies and waveforms, and their effects on deformation of AA6061 Aluminium alloy tub
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48

Alford, Matthew H., and Zhongxiang Zhao. "Global Patterns of Low-Mode Internal-Wave Propagation. Part I: Energy and Energy Flux." Journal of Physical Oceanography 37, no. 7 (2007): 1829–48. http://dx.doi.org/10.1175/jpo3085.1.

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Abstract Extending an earlier attempt to understand long-range propagation of the global internal-wave field, the energy E and horizontal energy flux F are computed for the two gravest baroclinic modes at 80 historical moorings around the globe. With bandpass filtering, the calculation is performed for the semidiurnal band (emphasizing M2 internal tides, generated by flow over sloping topography) and for the near-inertial band (emphasizing wind-generated waves near the Coriolis frequency). The time dependence of semidiurnal E and F is first examined at six locations north of the Hawaiian Ridge
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49

Diaz-Hernandez, Gabriel, Fernando J. Mendez, and Roberto Mínguez. "Numerical Analysis and Diagnosis of the Hydrodynamic Effects Produced by Hurricane Gordon along the Coast of Spain." Weather and Forecasting 29, no. 3 (2014): 666–83. http://dx.doi.org/10.1175/waf-d-13-00130.1.

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Abstract This paper presents a detailed hindcast for the generation and propagation of sea state variables—significant wave height Hs, peak period Tp, mean direction θ, and spectral shape γ –σ —associated with cyclonic events to numerically diagnose their possible hydrodynamic effects over the northeastern Atlantic. An example of such cyclonic events is Hurricane Gordon, which occurred during the second half of August 2012. Extreme hurricane-strength winds produced new and atypically low-frequency (about 14 s) packs of energy. The preexistent wave spectrum suddenly experienced an addition of l
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50

Yu, Chi, Sheng Zhang, and Cheng Zhang. "Coupling Effects of a Top-Hinged Buoyancy Can on the Vortex-Induced Vibration of a Riser Model in Currents and Waves." Journal of Marine Science and Engineering 12, no. 5 (2024): 751. http://dx.doi.org/10.3390/jmse12050751.

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In order to investigate the effects of the top-end dynamic boundary of risers caused by floater motions on their vortex-induced vibration (VIV) characteristics, a combined model comprising a buoyancy can with a relatively simple structural form and a riser is taken as the research object in the present study. The aspect ratios of the buoyancy can and the riser model are 5.37 and 250, respectively. A set of experimental devices is designed to support the VIV test of the riser with a dynamic boundary stimulating the vortex-induced motion (VIM) of the buoyancy can under different uniform flow and
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