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Journal articles on the topic 'Low latitude region'

Author: Grafiati

Published: 6 September 2023

Last updated: 19 July 2025

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1

Santos, Jefferson Souza, Debra Jean Skene, Cibele Aparecida Crispim, and Claudia Roberta de Castro Moreno. "Seasonal and Regional Differences in Eating Times in a Representative Sample of the Brazilian Population." Nutrients 15, no. 18 (2023): 4019. http://dx.doi.org/10.3390/nu15184019.

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Human food intake and its timing are a complex behavior that can be influenced by a variety of factors, some of which may vary from season to season or from region to region. In this study, our aim was to investigate the seasonal variation in food intake times, with a particular focus on how these may vary across different regions of a country. We conducted an analysis of data from 20,622 adults from the National Household Budget Survey (POF-IBGE), encompassing complete food diaries collected from individuals residing in Brazil, and thereby ensuring representation across different latitudes. E

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2

Jensen, J. W., and B. G. Fejer. "Longitudinal dependence of middle and low latitude zonal plasma drifts measured by DE-2." Annales Geophysicae 25, no. 12 (2007): 2551–59. http://dx.doi.org/10.5194/angeo-25-2551-2007.

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Abstract. We used ion drift observations from the DE-2 satellite to study for the first time the longitudinal variations of middle and low latitude F region zonal plasma drifts during quiet and disturbed conditions. The quiet-time middle latitude drifts are predominantly westward; the low latitude drifts are westward during the day and eastward at night. The daytime quiet-time drifts do not change much with longitude; the nighttime drifts have strong season dependent longitudinal variations. In the dusk-premidnight period, the equinoctial middle latitude westward drifts are smallest in the Eur

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3

Stening, R. J. "Modelling the low latitude F region." Journal of Atmospheric and Terrestrial Physics 54, no. 11-12 (1992): 1387–412. http://dx.doi.org/10.1016/0021-9169(92)90147-d.

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Qu, Tao, Lifeng Zhang, Yuan Wang, Xu Wang, and Jiping Guan. "Seasonal Variations in the Vertical Wavenumber Spectra of Stratospheric Gravity Waves in the Asian Monsoon Region Derived from COSMIC-2 Data." Remote Sensing 14, no. 24 (2022): 6336. http://dx.doi.org/10.3390/rs14246336.

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We used the Constellation Observing System for Meteorology, Ionosphere, and Climate-2 (COSMIC-2) dry temperature profile data from December 2019 to November 2021 to study the vertical wavenumber spectra of the potential energy of stratospheric gravity waves (GWs Ep) in the Asian monsoon region (15–45°N, 70–150°E). The GW Ep decreases with increasing vertical wavenumber, and the spectral slope varies with wavenumber. The spectral slope becomes smaller over a wavenumber range of 0.1–0.45 km−1, and larger from 0.45–1 km−1, with increasing wavenumber. The energy density distribution at middle and

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Zhou, Yan, Yu-Yan Sara Zhao, Xiaoting Xu, and Yiran Wang. "Characteristics and Climatic Indications of Ice-Related Landforms at Low Latitudes (0°–±30°) on Mars." Remote Sensing 17, no. 11 (2025): 1939. https://doi.org/10.3390/rs17111939.

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The deposition and evolution of ice-rich materials on Martian surfaces offer valuable insights into climatic evolution and the potential driving forces behind global climate change. Substantial evidence indicates that the mid-latitudes of Mars played a crucial role in the formation and development of glacial and periglacial landforms during the Amazonian period. However, few studies have comprehensively examined ice-related landforms in the low-latitude region of Mars. Whether extensive glacial activity has occurred in the equatorial region of Mars and whether there are any potential geologica

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Zhou, Yun-Liang, Li Wang, Chao Xiong, Hermann Lühr, and Shu-Ying Ma. "The solar activity dependence of nonmigrating tides in electron density at low and middle latitudes observed by CHAMP and GRACE." Annales Geophysicae 34, no. 4 (2016): 463–72. http://dx.doi.org/10.5194/angeo-34-463-2016.

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Abstract. In this paper we use more than a decade of in situ electron density observations from CHAMP and GRACE satellites to investigate the solar activity dependence of nonmigrating tides at both low and middle latitudes. The results indicate that the longitudinal patterns of F region electron density vary with season and latitude, which are exhibiting a wavenumber 4 (WN4) pattern around September equinox at low latitudes and WN1/WN2 patterns during local summer at the southern/northern middle latitudes. These wave patterns in the F region ionosphere can clearly be seen during both solar max

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Abe, Oladipo Emmanuel, Xurxo Otero Villamide, Claudia Paparini, Rodrigue Herbert Ngaya, Sandro M. Radicella, and Bruno Nava. "Signature of ionospheric irregularities under different geophysical conditions on SBAS performance in the western African low-latitude region." Annales Geophysicae 35, no. 1 (2017): 1–9. http://dx.doi.org/10.5194/angeo-35-1-2017.

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Abstract. Rate of change of TEC (ROT) and its index (ROTI) are considered a good proxy to characterize the occurrence of ionospheric plasma irregularities like those observed after sunset at low latitudes. SBASs (satellite-based augmentation systems) are civil aviation systems that provide wide-area or regional improvement to single-frequency satellite navigation using GNSS (Global Navigation Satellite System) constellations. Plasma irregularities in the path of the GNSS signal after sunset cause severe phase fluctuations and loss of locks of the signals in GNSS receiver at low-latitude region

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8

Dabas, R. S., R. M. Das, V. K. Vohra, and C. V. Devasia. "Space weather impact on the equatorial and low latitude F-region ionosphere over India." Annales Geophysicae 24, no. 1 (2006): 97–105. http://dx.doi.org/10.5194/angeo-24-97-2006.

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Abstract. For a detailed study of the space weather impact on the equatorial and low latitude F-region, the ionospheric response features are analysed during the periods of three recent and most severe magnetic storm events of the present solar cycle which occurred in October and November 2003, and November 2004. The F-layer base height (h'F), peak height (hmF2) and critical frequency (foF2) data, from Trivandrum, an equatorial station and Delhi, a low latitude location, are examined during the three magnetic storm periods. The results of the analysis clearly shows that the height of the F-reg

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9

Wang, Yang, Zuhong Fan, Tian Tian, Ying Deng, and Hong Zhao. "Leaf–Soil Carbon, Nitrogen, and Phosphorus Ecological Stoichiometry and Adaptation in Karst Plant Communities." Sustainability 17, no. 13 (2025): 5790. https://doi.org/10.3390/su17135790.

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In order to elucidate the factors regulating nutrient dynamics in plant–soil interactions across various latitudes within the karst climax community, this study focused on the karst forest climax community in Guizhou Province, Southwest China. We analyzed and compared the differences in carbon, nitrogen, and phosphorus content, as well as stoichiometry, in plant leaves and soils under various growing conditions. Additionally, redundancy analyses were conducted to investigate the stoichiometric correlations between plants and soil. The research findings indicate the following: (1) Leaf carbon c

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10

Morita, Takeshi, and Krzysztof Błażejczyk. "Seasonal Variations in Melatonin Secretory Rhythms in High-, Middle-, and Low-Latitude Regions." Przegląd Geograficzny 95, no. 3 (2023): 225–35. http://dx.doi.org/10.7163/przg.2023.3.1.

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This study aims to measure the daily melatonin secretory rhythms of people living in high-, mid-, and low-latitude regions characterised by different day lengths and global solar-radiation conditions. In Poland, a high-latitude region, the amount of melatonin secretion is greater, with secretion occurring earlier (exemplifying phase advance). On the other hand, in Vietnam, a low-latitude region, the level is lower and occurs later (phase delay). Japan, a mid-latitude region, shows behaviour intermediate between these two. Melatonin secretory rhythm in Vietnam is closely related to Day length a

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11

Yizengaw, E., E. A. Essex, and R. Birsa. "The Southern Hemisphere and equatorial region ionization response for a 22 September 1999 severe magnetic storm." Annales Geophysicae 22, no. 8 (2004): 2765–73. http://dx.doi.org/10.5194/angeo-22-2765-2004.

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Abstract. The ionospheric storm evolution process was monitored during the 22 September 1999 magnetic storm over the Australian eastern region, through measurements of the ionospheric Total Electron Content (TEC) from seven Global Positioning Systems (GPS) stations. The spatial and temporal variations of the ionosphere were analysed as a time series of TEC maps. Results of our analysis show that the main ionospheric effect of the storm under consideration are: the long lasting negative storm effect during a magnetic storm at mid-latitude regions; the strong, positive disturbances during the st

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12

Krishna Murthy, B. V., and S. S. Hari. "Electric fields in the low latitude F-region." Advances in Space Research 18, no. 6 (1996): 93–98. http://dx.doi.org/10.1016/0273-1177(95)00906-x.

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13

Hansen, Marc, Daniela Banyś, Mark Clilverd, David Wenzel, Tero Raita, and Mohammed Mainul Hoque. "Investigation of the October effect in very low-frequency (VLF) signals." Annales Geophysicae 43, no. 1 (2025): 55–65. https://doi.org/10.5194/angeo-43-55-2025.

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Abstract. Subionospheric very low-frequency (VLF) radio signals are reflected by free electrons in the ionospheric D-region at about 60–90 km altitude and can propagate over long distances, which makes them useful for monitoring the state of the D-region or perturbations due to solar flares. At the D-region height, the ionosphere is mainly ionized by solar Lyman-α radiation. The reflection characteristics of VLF signals depend on the state and dynamics of the D-region, which is highly influenced by Lyman-α radiation. Although the amplitude of the received terrestrial VLF signal changes as a fu

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14

Luo, Wenhui, Jinji Ma, Miao Li, Haifeng Xu, Cheng Wan, and Zhengqiang Li. "Spatial and Temporal Characterization of Near Space Temperature and Humidity and Their Driving Influences." Remote Sensing 16, no. 22 (2024): 4307. http://dx.doi.org/10.3390/rs16224307.

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Near space refers to the atmospheric region 20–100 km above Earth’s surface, encompassing the stratosphere, mesosphere, and part of the thermosphere. This region is susceptible to surface and upper atmospheric disturbances, and the atmospheric temperature and humidity profiles can finely characterize its complex environment. To analyze the relationship between changes in temperature and humidity profiles and natural activities, this study utilizes 18 years of temperature and water vapor data from the TIMED/SABER and AURA/MLS instruments to investigate the variations in temperature and humidity

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15

Rozhnoi, A., M. Solovieva, O. Molchanov, et al. "Statistical correlation of spectral broadening in VLF transmitter signal and low-frequency ionospheric turbulence from observation on DEMETER satellite." Natural Hazards and Earth System Sciences 8, no. 5 (2008): 1105–11. http://dx.doi.org/10.5194/nhess-8-1105-2008.

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Abstract. In our earlier papers we have found the effect of VLF transmitter signal depression over epicenters of the large earthquakes from observation on the French DEMETER satellite that can be considered as new method of global diagnostics of seismic influence on the ionosphere. At present paper we investigate a possibility VLF signal-ionospheric turbulence interaction using additional characteristic of VLF signal-spectrum broadening. This characteristic is important for estimation of the interaction type: linear or nonlinear scattering. Our main results are the following: – There are two z

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16

Kumar, Edwin A., and Sushil Kumar. "Geomagnetic Storm Effect on F2-Region Ionosphere during 2012 at Low- and Mid-Latitude-Latitude Stations in the Southern Hemisphere." Atmosphere 13, no. 3 (2022): 480. http://dx.doi.org/10.3390/atmos13030480.

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The ionospheric effects of six intense geomagnetic storms with Dst index ≤ −100 nT that occurred in 2012 were studied at a low-latitude station, Darwin (Geomagnetic coordinates, 21.96° S, 202.84° E), a low-mid-latitude station, Townsville (28.95° S, 220.72° E), and a mid-latitude station, Canberra (45.65° S, 226.30° E), in the Australian Region, by analyzing the storm–time variations in the critical frequency of the F2-region (foF2). Out of six storms, a storm of 23–24 April did not produce any ionospheric effect. The storms of 30 September–3 October (minimum Dst = −122 nT) and 7–10 October (m

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17

Yamauchi, Masatoshi, Magnar G. Johnsen, Carl-Fredrik Enell, Anders Tjulin, Anna Willer, and Dmitry A. Sormakov. "High-latitude crochet: solar-flare-induced magnetic disturbance independent from low-latitude crochet." Annales Geophysicae 38, no. 6 (2020): 1159–70. http://dx.doi.org/10.5194/angeo-38-1159-2020.

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Abstract. A solar-flare-induced, high-latitude (peak at 70–75∘ geographic latitude – GGlat) ionospheric current system was studied. Right after the X9.3 flare on 6 September 2017, magnetic stations at 68–77∘ GGlat near local noon detected northward geomagnetic deviations (ΔB) for more than 3 h, with peak amplitudes of >200 nT without any accompanying substorm activities. From its location, this solar flare effect, or crochet, is different from previously studied ones, namely, the subsolar crochet (seen at lower latitudes), auroral crochet (pre-requires auroral electrojet in sunlight), or cu

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18

Yizengaw, Endawoke. "Global Longitudinal Dependence Observation of the Neutral Wind and Ionospheric Density Distribution." International Journal of Geophysics 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/342581.

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The statistical global view of the low-latitude ionospheric density stimulates further interest in studying the strong longitudinal variability of the ionospheric density structures in low-to-equatorial latitudes. However, we are not completely certain how the electrodynamics and ion-neutral coupling proceeds at low latitudes; in particular, the longitudinal difference in the dynamics of plasma structures in the low-to-mid latitude ionosphere is not yet fully understood. Numerical studies of latent heat release in the troposphere have indicated that the lower atmosphere can indeed introduce a

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19

Zhang, H., Y. Liu, J. Wu, T. Xu, and D. Sheng. "Observations and modeling of UHF-band scintillation occurrence probability over the low-latitude region of China during the maximum activity of solar cycle 24." Annales Geophysicae 33, no. 1 (2015): 93–100. http://dx.doi.org/10.5194/angeo-33-93-2015.

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Abstract. The climatological characteristics of UHF-band scintillations over the low-latitude region of China were investigated by analyzing the observations recorded at three stations of our regional network of satellite-beacon-based scintillation monitoring in 2013. The three stations are Hainan (geographic 20.0° N, 110.3° E; geomagnetic 10.1° N, 177.4° W, dip 28.2°), Guangzhou (geographic 23.0° N, 113.0° E; geomagnetic 13.1° N, 174.8° W, dip 33.9°) and Kunming (geographic 25.6° N, 103.7° E; geomagnetic 15.7° N, 176.4° E, dip 39.0°), located at low latitudes of China. The variations of UHF-b

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Chen, Yiding, Libo Liu, Huijun Le, Hui Zhang, and Ruilong Zhang. "Responding trends of ionospheric F₂-layer to weaker geomagnetic activities." Journal of Space Weather and Space Climate 12 (2022): 6. http://dx.doi.org/10.1051/swsc/2022005.

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Geomagnetic activities frequently occur in varying degrees. Strong geomagnetic activities, which have been widely investigated, occur occasionally; they can cause distinguishable and significant disturbances in the ionosphere. Weaker geomagnetic activities frequently appear, whereas their effects are generally difficult to be distinguished from complex ionospheric variations. Weaker geomagnetic activities play important roles in ionospheric day-to-day variability thus should deserve further attention. In this study, long-term (longer than one solar cycle) measurements of the F2-layer critical

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Patra, A. K., S. Sripathi, P. B. Rao, and K. S. V. Subbarao. "Simultaneous VHF radar backscatter and ionosonde observations of low-latitude E region." Annales Geophysicae 23, no. 3 (2005): 773–79. http://dx.doi.org/10.5194/angeo-23-773-2005.

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Abstract. The first results of simultaneous observations made on the low-latitude field-aligned irregularities (FAI) using the MST radar located at Gadanki (13.5° N, 79.2° E, dip 12.5°) and the Es parameters using an ionosonde at a nearby station Sriharikota (13.7° N, 80.1° E, dip 12.6°) are presented. The observations show that while the height of the most intense radar echoes is below the virtual height of Es (h'Es) during daytime, it is found to be either below or above during nighttime. The strength of the FAI is better correlated with the top penetration frequency (ftEs) and the blanketin

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Pryse, S. E., R. W. Sims, J. Moen, and K. Oksavik. "Ionospheric signatures of the low-latitude boundary layer under conditions of northward IMF and small clock angle." Annales Geophysicae 24, no. 8 (2006): 2169–78. http://dx.doi.org/10.5194/angeo-24-2169-2006.

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Abstract. A case study is presented that concerns the footprints of the low-latitude boundary layer in the high-latitude ionosphere. The measurements were made near local magnetic noon in summertime under conditions of Bz>0 and small clock angle. Of particular interest are particle fluxes measured in the region by the NOAA-12 satellite that revealed energetic (>30 keV) electrons, characteristic of trapped particles, together with a population of softer precipitating magnetosheath particles. The particle energy-distribution was distinct from those identifying the central plasma sheet at l

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Pastor Yabar, A., M. J. Martínez González, and M. Collados. "Photospheric magnetic topology of a north polar region." Astronomy & Astrophysics 635 (March 2020): A210. http://dx.doi.org/10.1051/0004-6361/202037480.

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Aims. We aim to characterise the magnetism of a large fraction of the north polar region close to a maximum of activity, when the polar regions are reversing their dominant polarity. Methods. We make use of full spectropolarimetric data from the CRisp Imaging Spectro-Polarimeter installed at the Swedish Solar Telescope. The data consist of a photospheric spectral line, which is used to infer the various physical parameters of different quiet Sun regions by means of the solution of the radiative transfer equation. We focus our analysis on the properties found for the north polar region and thei

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Aldahan, A., G. Possnert, A. El Saiy, and O. Abdelghany. "Particle-bound 10Be from a low latitude arid region." Journal of Radioanalytical and Nuclear Chemistry 299, no. 3 (2013): 1709–13. http://dx.doi.org/10.1007/s10967-013-2853-8.

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Maute, Astrid, and Arthur D. Richmond. "$F$-Region Dynamo Simulations at Low and Mid-Latitude." Space Science Reviews 206, no. 1-4 (2016): 471–93. http://dx.doi.org/10.1007/s11214-016-0262-3.

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Haitaamar, Zineddine, Abdulrahman Sulaiman, Sidi Ahmed Bendoukha, and Diogo Rodrigues. "Lower Inclination Orbit Concept for Direct-Communication-To-Satellite Internet-Of-Things Using Lean Satellite Standard in Near-Equatorial Regions." Applied Sciences 13, no. 9 (2023): 5654. http://dx.doi.org/10.3390/app13095654.

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This research proposes a low-inclined orbit concept and design for the Internet-of-Things (IoT) using lean satellite standards in near-equatorial regions. The study aims to evaluate the coverage of various inclination angles at various latitudes and inclination angles in order to determine the most suitable satellite design for providing IoT coverage in these regions. The main methods applied in the study included analyzing the coverage performance of different inclination angles, the link budget analysis using simulations and the definition of the mission criteria. The results of the study sh

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Sen, Arnab, Sujay Pal, Bakul Das, and Sushanta K. Mondal. "D- and F-Region Ionospheric Response to the Severe Geomagnetic Storm of April 2023." Atmosphere 16, no. 6 (2025): 716. https://doi.org/10.3390/atmos16060716.

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This study investigates the impact on the Earth’s ionosphere of a severe geomagnetic storm (Dst ∼ −212 nT) that began on 23 April 2023 at around 17:37 UT according to very low-frequency (VLF, 3–30 kHz) or low-frequency (LF, 30–300 kHz) radio signals and ionosonde data. We analyze VLF/LF signals received by SuperSID monitors located in mid-latitude (Europe) and low-latitude (South America, Colombia) areas across nine different propagation paths in the Northern Hemisphere. Mid-latitude regions exhibited a daytime amplitude perturbation, mostly an increase, by ∼3–5 dB during the storm period, wit

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Pitout, F., P. T. Newell, and S. C. Buchert. "Simultaneous high- and low-latitude reconnection: ESR and DMSP observations." Annales Geophysicae 20, no. 9 (2002): 1311–20. http://dx.doi.org/10.5194/angeo-20-1311-2002.

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Abstract. We present EISCAT Svalbard Radar and DMSP observations of a double cusp during an interval of predominantly northward IMF on 26 November 2000. In the cusp region, the ESR dish, pointing northward, recorded sun-ward ionospheric flow at high latitudes (above 82° GL), indicating reconnection occuring in the magnetospheric lobe. Meanwhile, the same dish also recorded bursts of poleward flow, indicative of bursty reconnection at the subsolar magnetopause. Within this time interval, the DMSP F13 satellite passed in the close vicinity of the Svalbard archipelago. The particle measurement on

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Tatsuta, K., Y. Hobara, S. Pal, and M. Balikhin. "Sub-ionospheric VLF signal anomaly due to geomagnetic storms: a statistical study." Annales Geophysicae 33, no. 11 (2015): 1457–67. http://dx.doi.org/10.5194/angeo-33-1457-2015.

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Abstract. We investigate quantitatively the effect of geomagnetic storms on the sub-ionospheric VLF/LF (Very Low Frequency/Low Frequency) propagations for different latitudes based on 2-year nighttime data from Japanese VLF/LF observation network. Three statistical parameters such as average signal amplitude, variability of the signal amplitude, and nighttime fluctuation were calculated daily for 2 years for 16–21 independent VLF/LF transmitter–receiver propagation paths consisting of three transmitters and seven receiving stations. These propagation paths are suitable to simultaneously study

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Cui, Suzhen, Yun Li, Le Liu, Qianhong Wang, and Feizhou Chen. "Changes in astaxanthin and fatty acid concentrations during the developmental process in the calanoid Arctodiaptomus walterianus in an alpine lake at low latitudes." Journal of Plankton Research 43, no. 2 (2021): 314–24. http://dx.doi.org/10.1093/plankt/fbab019.

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Abstract Astaxanthin is ubiquitous in calanoid copepods in high latitude or altitude regions and is well studied. However, the dynamics of astaxanthin in calanoids at low latitudes are less studied. We collected samples during the ice-free season from Lake Mubanghai, an alpine lake located in a low-latitude and high-altitude region, and analyzed astaxanthin content changes among different developmental stages in Arctodiaptomus walterianus. The total astaxanthin content in A. walterianus varied from 1.66 to 4.49 μg/mg dry weight and was highest in October, the month with the lowest temperature

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Liu, Tong, Zhibin Yu, Zonghua Ding, Wenfeng Nie, and Guochang Xu. "Observation of Ionospheric Gravity Waves Introduced by Thunderstorms in Low Latitudes China by GNSS." Remote Sensing 13, no. 20 (2021): 4131. http://dx.doi.org/10.3390/rs13204131.

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The disturbances of the ionosphere caused by thunderstorms or lightning events in the troposphere have an impact on global navigation satellite system (GNSS) signals. Gravity waves (GWs) triggered by thunderstorms are one of the main factors that drive short-period Travelling Ionospheric Disturbances (TIDs). At mid-latitudes, ionospheric GWs can be detected by GNSS signals. However, at low latitudes, the multi-variability of the ionosphere leads to difficulties in identifying GWs induced by thunderstorms through GNSS data. Though disturbances of the ionosphere during low-latitude thunderstorms

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Tilahun, Atirsaw Muluye, Edward Uluma, and Yohannes Getachew Ejigu. "Variation in Total Electron Content During a Severe Geomagnetic Storm, 23–24 April 2023." Atmosphere 16, no. 6 (2025): 676. https://doi.org/10.3390/atmos16060676.

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In this paper, we study the geomagnetic storm that occurred on 23–24 April 2023. We present variations in the values of interplanetary magnetic field (IMF-Bz), solar wind parameters (Vsw, Nsw, Tsw, and Psw), geomagnetic index (SYM-H), and vertical total electron content (VTEC) obtained from 18 GPS-TEC stations situated in equatorial, mid-latitude, and high-latitude regions. We analyze the variations in total electron content (TEC) before, during, and after the storm using VTEC plots, dTEC% plots, and global ionospheric maps for each GNSS receiver station, all referenced to universal time (UT).

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N, Dr Swathi. "Performance Evaluation of Delay Locked Loop based GPS Multipath Estimation Algorithm over Low Latitude Region." Journal of Advanced Research in Dynamical and Control Systems 12, SP7 (2020): 2395–403. http://dx.doi.org/10.5373/jardcs/v12sp7/20202368.

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Zhang, D. H., W. Zhang, Q. Li, L. Q. Shi, Y. Q. Hao, and Z. Xiao. "Accuracy analysis of the GPS instrumental bias estimated from observations in middle and low latitudes." Annales Geophysicae 28, no. 8 (2010): 1571–80. http://dx.doi.org/10.5194/angeo-28-1571-2010.

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Abstract. With one bias estimation method, the latitude-related error distribution of instrumental biases estimated from the GPS observations in Chinese middle and low latitude region in 2004 is analyzed statistically. It is found that the error of GPS instrumental biases estimated under the assumption of a quiet ionosphere has an increasing tendency with the latitude decreasing. Besides the asymmetrical distribution of the plasmaspheric electron content, the obvious spatial gradient of the ionospheric total electron content (TEC) along the meridional line that related to the Equatorial Ionosp

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Vichare, Geeta, Ankush Bhaskar, Rahul Rawat, et al. "Low-latitude Auroras: Insights from 2023 April 23 Solar Storm." Astrophysical Journal 977, no. 2 (2024): 171. https://doi.org/10.3847/1538-4357/ad8dd3.

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Abstract In 2023 April, a low-latitude aurora observed by the all-sky camera at Hanle, Ladakh, India (33°14’N geographic latitude), generated significant interest. This was the first such aurora recorded from the Indian region in the space era and occurred during a moderate solar storm. This study explores this low-latitude auroral sighting, which happened during the sheath-region passage of an interplanetary coronal mass ejection. We analyze in situ multispacecraft particle measurements and geomagnetic field observations from both ground-based and satellite-based magnetometers. The auroral ob

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Nemecek, Z., A. Fedorov, J. Safrankova, and G. Zastenker. "Structure of the low-latitude magnetopause: MAGION-4 observations." Annales Geophysicae 15, no. 5 (1997): 553–61. http://dx.doi.org/10.1007/s00585-997-0553-9.

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Abstract. The aims of this paper are (1) briefly to describe the plasma devices onboard the MAGION-4 satellite, launched on 3 August 1995, of the INTERBALL project, and (2) to discuss first observations made near the magnetopause region. During the presented boundary crossings the MAGION-4 observed quasi-periodic pulses of magnetosheath-like plasma in a region of low plasma density. This region is located just earthwards of the magnetopause and is populated by a plasma which, except for the density, has the same parameters as in the magnetosheath. Deeper in the magnetosphere, the encounter of

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Li, Yaoguo, Misac Nabighian, and Douglas W. Oldenburg. "Using an equivalent source with positivity for low-latitude reduction to the pole without striation." GEOPHYSICS 79, no. 6 (2014): J81—J90. http://dx.doi.org/10.1190/geo2014-0134.1.

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We present a reformulation of reduction to the pole (RTP) of magnetic data at low latitudes and the equator using equivalent sources. The proposed method addresses both the theoretical difficulty of low-latitude instability and the practical issue of computational cost. We prove that a positive equivalent source exists when the magnetic data are produced by normal induced magnetization, and we show that the positivity is sufficient to overcome the low-latitude instability in the space domain. We further apply a regularization term directly to the recovered RTP field to improve the solution. Th

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Wang, Ren, Jingxiang Gao, Yifei Yao, Peng Sun, and Moufeng Wan. "Assessment of the Algorithm for Single Frequency Precise Point Positioning at Different Latitudes and with Distinct Magnetic Storm Conditions." Applied Sciences 10, no. 7 (2020): 2268. http://dx.doi.org/10.3390/app10072268.

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This paper analyzes the convergence time and the root mean square (RMS) error of single frequency (SF) precise point positioning (PPP) in the ionospheric-constrained (TIC1) and troposphere- and ionospheric-constrained (TIC2) conditions, when the stations are at a low latitude, mid-latitude, and high latitude area during the period of a magnetic storm (MS) and a non-magnetic storm (NMS). In this paper, 375 IGS (international global navigation satellite system (GNSS) service) stations were selected from all over the world for 30 days in September 2017. The 24 hour daily observations were split f

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Shen, Linlin, Haiyan Deng, Ganglong Zhang, Anqi Ma, and Xiaoyong Mo. "Effect of Climate Change on the Potentially Suitable Distribution Pattern of Castanopsis hystrix Miq. in China." Plants 12, no. 4 (2023): 717. http://dx.doi.org/10.3390/plants12040717.

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Climate warming poses a great threat to ecosystems worldwide, which significantly affects the geographical distribution and suitable growth area of species. Taking Castanopsis hystrix Miq. as the research object, the potentially suitable cultivation regions under present and future climatic emission scenarios in China were predicted based on the MaxEnt model with 360 effective individual distributions and eight environmental variables. The min temperature of coldest month (bio6), precipitation of driest month (bio14), and precipitation of warmest quarter (bio18) are three leading factors affec

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Venkatesham, K., and Rajesh Singh. "Extreme Space-Weather Effect on D-Region Ionosphere in Indian Low Latitude Region." Current Science 114, no. 09 (2018): 1923. http://dx.doi.org/10.18520/cs/v114/i09/1923-1926.

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Liu, Wenxuan, Hu Wang, Hongyang Ma, et al. "Analysis of Regional Satellite Clock Bias Characteristics Based on BeiDou System." Remote Sensing 14, no. 23 (2022): 6047. http://dx.doi.org/10.3390/rs14236047.

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With the continuous development of the Global Navigation Satellite System (GNSS), the calculation theory and strategy of the global Satellite Clock Bias (SCB) tends to be mature. However, in some eventualities with restricted conditions, the calculation and application of the global SCB are limited; hence, the application of regional SCB is derived. This paper focuses on the quality of regional SCB products in different regions, calculates three groups of regional SCB products, and analyzes their properties and application effects. We expand the double-differenced assessment method for SCB and

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Yang, Yu, Dayong Wen, and Jie Cao. "Linkage of the Circumglobal Teleconnection and the Interannual Variability of Early Spring Diabatic Heating over Low-Latitude Highlands in Southeast Asia." Journal of Climate 36, no. 10 (2023): 3217–29. http://dx.doi.org/10.1175/jcli-d-22-0659.1.

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Abstract This study explores the linkage of the circumglobal teleconnection (CGT) on the variability of early spring diabatic heating over the Southeast Asian low-latitude highlands (SEALLH) using ERA5 data. The early spring diabatic heating over the SEALLH shows significant interannual variability with a quasi-3-yr period. Anomalies in the advection of the early spring diabatic heating in the troposphere over the SEALLH associated with CGT are mainly responsible for the interannual variability of early spring diabatic heating over the SEALLH. When CGT is in phase with an anomalous cyclone ove

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Patra, A. K., and N. Venkateswara Rao. "Low-latitude valley region irregularities studied using the Gadanki radar." Journal of Geophysical Research: Space Physics 112, A3 (2007): n/a. http://dx.doi.org/10.1029/2006ja011857.

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Aashiq Hussain Bhat, Bilal Ahmad Ganaie, T K Ramkumar, Manzoor A Malik, and P Pavan Chaitanya. "Westward Drift of Ionospheric Plasma Irregularities over a Low to Mid-latitude Transition Region in Indian Sector." Annals of Geophysics 64, no. 4 (2021): PA437. http://dx.doi.org/10.4401/ag-8510.

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We report the observation of plasma depletions/plumes in the F region ionosphere over a low to middle latitude transition region in the Indian sector. The observation of these plasma depletions is based on the data obtained in May 2019 through the all-sky airglow CCD imager installed in the campus of University of Kashmir, Srinagar (34.12 °N, 74.83 °E, magnetic latitude 25.91 °N). The depletions on the two consecutive nights of 05 and 06 May 2019 are aligned along the North-South (N-S) direction and drift westward. Several depletion bands along with some enhancement bands are seen in the 630-n

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Zhu, Tao, and Jing Yang. "Two Types of Mid-High-Latitude Low-Frequency Intraseasonal Oscillations near the Ural Mountains during Boreal Summer." Journal of Climate 34, no. 11 (2021): 4279–96. http://dx.doi.org/10.1175/jcli-d-20-0589.1.

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AbstractTwo types of mid-high-latitude low-frequency intraseasonal oscillations (LF-ISOs), featuring eastward and westward propagation, have been identified over the Eurasian continent in the past 37 summers (1982–2018). The eastward and westward propagating modes commonly have a dominant periodicity of 30–50 days near the Ural Mountains (UM) but have different origins and evolutions. The eastward propagating LF-ISO initiates over eastern North America, migrates northeastward across northeastern North America–western North Atlantic, central North Atlantic, western Europe, and the UM, then prop

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Arkani‐Hamed, J. "Differential reduction‐to‐the‐pole of regional magnetic anomalies." GEOPHYSICS 53, no. 12 (1988): 1592–600. http://dx.doi.org/10.1190/1.1442441.

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I present a differential reduction‐to‐the‐pole technique that reduces regional scale magnetic anomalies to the geomagnetic pole, while taking into account the variations in the direction of the geomagnetic field and that of the magnetization of the crust over the region. The technique is developed in the spectral frequency domain as an inverse problem solved iteratively using a perturbation method. I regard the variations in the directions as finite perturbations about the mean values of the directions over the region and evaluate the nonlinear coupling terms due to these perturbations in the

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Li, Jianfeng, Yongqian Wang, Shiqi Yang, and Fang Wang. "Characteristics of Low-Latitude Ionosphere Activity and Deterioration of TEC Model during the 7–9 September 2017 Magnetic Storm." Atmosphere 13, no. 9 (2022): 1365. http://dx.doi.org/10.3390/atmos13091365.

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Under the influence of space weather, abnormal disturbances in the ionosphere will distort the ionosphere model seriously and affect the global navigation satellite system negatively. This study analyzes the ionospheric activity characteristics and the ionospheric model performance in low latitude during a strong geomagnetic storm from 7 to 9 September 2017. The research goals are to determine the abnormal behavior of the ionosphere during the geomagnetic storm and to refine the ionosphere model in the low latitude. In the experiment, the vertical total electron content (VTEC) peak value at lo

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Bhuyan, P. K., P. K. Kakoty, and S. B. Singh. "Theoretical simulation of O<sup>+</sup> and H<sup>+</sup> densities in the Indian low latitude F-region and comparison with observations." Annales Geophysicae 20, no. 12 (2002): 1959–66. http://dx.doi.org/10.5194/angeo-20-1959-2002.

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Abstract. The O+ and H+ ion density distributions in the Indian low latitude F-region, within ± 15° magnetic latitudes, are simulated using a time dependent model developed on the basis of solution of the plasma continuity equation. The simulated ion densities for solar minimum June and December solstices are then compared with ionosonde observations from the period 1959–1979 and measurements made by the Indian SROSS C2 satellite during 1995–1996 at an altitude of ~ 500 km. The simulated O+ density has a minimum around pre-sunrise hours and a maximum during noontime. H+ density is higher at ni

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De La Torre Castro, Elena, Tina Jurkat-Witschas, Armin Afchine, et al. "Differences in microphysical properties of cirrus at high and mid-latitudes." Atmospheric Chemistry and Physics 23, no. 20 (2023): 13167–89. http://dx.doi.org/10.5194/acp-23-13167-2023.

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Abstract. Despite their proven importance for the atmospheric radiative energy budget, the effect of cirrus on climate and the magnitude of their modification by human activity is not well quantified. Besides anthropogenic pollution sources on the ground, aviation has a large local effect on cirrus microphysical and radiative properties via the formation of contrails and their transition to contrail cirrus. To investigate the anthropogenic influence on natural cirrus, we compare the microphysical properties of cirrus measured at mid-latitude (ML) regions (<60∘ N) that are often affected by

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Dmitriev, A., and H. C. Yeh. "Storm-time ionization enhancements at the topside low-latitude ionosphere." Annales Geophysicae 26, no. 4 (2008): 867–76. http://dx.doi.org/10.5194/angeo-26-867-2008.

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Abstract. Ion density enhancements at the topside low-latitude ionosphere during a Bastille storm on 15–16 July 2000 and Halloween storms on 29–31 October 2003 were studied using data from ROCSAT-1/IPEI experiment. Prominent ion density enhancements demonstrate similar temporal dynamics both in the sunlit and in the nightside hemispheres. The ion density increases dramatically (up to two orders of magnitude) during the main phase of the geomagnetic storms and reaches peak values at the storm maximum. The density enhancements are mostly localized in the region of a South Atlantic Anomaly (SAA),

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