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Dissertations / Theses on the topic 'Ionosphere'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Ssessanga, Nicholas. "Development of an ionospheric map for Africa." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1011498.

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This thesis presents research pertaining to the development of an African Ionospheric Map (AIM). An ionospheric map is a computer program that is able to display spatial and temporal representations of ionospheric parameters such as, electron density and critical plasma frequencies, for every geographical location on the map. The purpose of this development was to make the most optimum use of all available data sources, namely ionosondes, satellites and models, and to implement error minimisation techniques in order to obtain the best result at any given location on the African continent. The

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2

Oyeyemi, Elijah Oyedola. "A global ionospheric F2 region peak electron density model using neural networks and extended geophysically relevant inputs." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005255.

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This thesis presents my research on the development of a neural network (NN) based global empirical model of the ionospheric F2 region peak electron density using extended geophysically relevant inputs. The main principle behind this approach has been to utilize parameters other than simple geographic co-ordinates, on which the F2 peak electron density is known to depend, and to exploit the technique of NNs, thereby establishing and modeling the non-linear dynamic processes (both in space and time)associated with the F2 region electron density on a global scale. Four different models have been

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3

Stolle, Claudia, Stefan Schlüter, Christoph Jacobi, Norbert Jakowski, and Armin Raabe. "Monitoring of a polar plasma convection event with GPS." Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-217497.

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When L-band radio waves of space based systems such as Global Positioning System (GPS) travel trough the ionosphere and plasmasphere their ray paths are perturbed due to the free electrons. Since the last decade these integrated measurements are used to map the ionosphere for navigational and scientific investigations. In November 2001 a polar plasma convection like ionospheric event has been recognised in vertical TEC maps produced with GPS data. This event on the one hand is shortly compared with the behaviour of the Interplanetary Magnetic Field (IMF) to which it may be related according to

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4

Norton, Andrew David. "Analysis of Ionospheric Data Sets to Identify Periodic Signatures Matching Atmospheric Planetary Waves." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/101791.

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Atmospheric planetary waves play a role in introducing variability to the low-latitude ionosphere. To better understand this coupling, this study investigates times when oscillations seen in both atmospheric planetary waves and ionospheric data-sets have similar periodicity. The planetary wave data-set used are temperature observations made by Sounding of the Atmosphere using Broadband Emission Radiometry (SABER). These highlight periods during which 2-Day westward propagating wave-number 3 waves are evident in the mesosphere and lower thermosphere. The ionospheric data-set is Total Electron C

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5

Haggard, Raymond. "The effects of particle precipitation on the ionosphere in the South Atlantic Anomaly Region." Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1005248.

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The first ground based observations of aeronomic phenomena in the South Atlantic Anomaly Region are presented. These data show that enhancements in foF2 and foE can be directly attributed to precipitated electron energy fluxes in the Anomaly Region. The regular occurrence of particle induced sporadic-E ionization is also presented together with the first measurable 391.4 nm airglow radiation of about 16 R. The first comprehensive survey of energy fluxes carried by energetic particles using satellites is also presented for both daytime and nighttime as well as the seasonal fluctuations. We foun

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6

Banola, S. "Some characteristics of ionospheric irregularities at low latitudes deduced from VHF scintillation measurements." Thesis, IIG, 2001. http://localhost:8080/xmlui/handle/123456789/1574.

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7

Gavrilov, Nikolaj M., Christoph Jacobi, and Dierk Kürschner. "Drifts and their short-period perturbations in the lower ionosphere observed at Collm during 1983 - 1999." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-215386.

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Estimations of the intensity of short-period perturbations of the horizontal drift velocity at 80 - 110 km altitude are made using data from the regular low-frequency D1 ionospheric reflection observations at Collm, Germany (52° N, 15° E) for the period 1983 - 1999. A simple half-hourly-difference numerical filter is used to extract perturbations with time scales between 0.7 and 3 hours. The results are compared with the mean drift analyses in order to study the interaction between short-period perturbations and the mean circulation. The average monthly variances of short-period perturbations

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8

Koparkar, P. V. "Studies in ionospheric physics with special reference to the ionospheric irregularities and VHF scintillations." Thesis, IIG, 1985. http://localhost:8080/xmlui/handle/123456789/1560.

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9

Johnson, Rosie Eleanor. "Infrared observations of Jupiter's ionosphere." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42409.

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In this thesis I have used infrared observations of Jupiter to investigate the flows of ions in the ionosphere and how they are coupled to the ionospheric heating in the auroral regions, determining the drivers of the heating and how they are related to the thermosphere and the magnetosphere. I investigated the H3+ line-of-sight velocity in the mid-to-low latitude region, derived from the Doppler shift of the Q(1,0-) emission line taken by IRTF-CSHELL. No evidence of flows in the region of the H Ly-α bulge predicted by a global circulation model were measured, and the H3+ ions in the mid-to-lo

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10

Panicciari, Tommaso. "Multiresolution tomography for the ionosphere." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.698998.

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The ionosphere is a dynamic and ionized medium. Specification of the ionospheric electron density is important for radio systems operating up to a few GHz. Such systems include communication, navigation and surveillance operations. Computerized Ionospheric Tomography (CIT) is a technique that allows specification of the electron density in the ionosphere. CIT, unlike medical tomography, has geometric limitations such as uneven and sparse distribution of ground-based receivers and limited-angle observations. The inversion is therefore underdetermined and to overcome the geometric limitations of

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11

Kürschner, Dierk, and Christoph Jacobi. "Long-term behaviour of E-region nighttime LF reflection heights." Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-217519.

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The nighttime reflection height of low-frequency (LF) radio waves at oblique incidence is measured at Collm Observatory using 1.8 kHz sideband phase comparisons between the sky wave and the ground wave of a commercial 177 kHz LF transmitter. The measurements have been carried out continuously since September 1982, now allowing the analysis of trends and regular variations of the reflection height. In the time series is found a) a long-term negative trend and b) a solar cycle dependence, both confirming earlier measurements and theoretical estimations. Moreover, a significant oscillation of qua

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12

Pathan, Bashir Mohammed. "Studies of low latitude ionosphere through satellite radio wave propagation." Thesis, IIG, 1994. http://localhost:8080/xmlui/handle/123456789/1566.

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13

Amabayo, Emirant Bertillas. "Multi-instrument observations of ionospheric irregularities over South Africa." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005261.

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The occurrence of mid-latitude spread F (SF) over South Africa has not been extensively studied since the installation of the DPS-4 digisondes at Madimbo (30.88◦E, 22.38◦S), Grahamstown (33.32◦S, 26.50◦E) and Louisvale (28.51◦S, 21.24◦E). This study is intended to quantify the probability of the occurrence of F region disturbances associated with ionospheric spread F (SF) and L-band scintillation over South Africa. This study used available ionosonde data for 8 years (2000-2008) from the three South African stations. The SF events were identified manually on ionograms and grouped for further s

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14

Da, Dalt Federico. "Ionospheric modelling and data assimilation." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665450.

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A New Ionospheric Model (ANIMo) based upon the physics of production, loss, and vertical transport has been developed. The model is driven by estimates of neutral composition, temperature and solar flux and is applicable to the mid-latitude regions of the Earth under quiet and moderate geomagnetic conditions. This model was designed to exhibit specific features that were not easy to find all together in other existing ionospheric models. ANIMo needed to be simple to use and interact with, relatively accurate, reliable, robust and computationally efficient. The definition of these characteristi

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15

Schlatter, Nicola. "Enhanced Radar Backscatter from the Ionosphere." Licentiate thesis, KTH, Rymd- och plasmafysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116669.

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Incoherent scatter radars are powerful ground based instruments for ionospheric measurements. By analysis of the Doppler shifted backscatter spectrum, containing the signature of electrostatic plasma waves, plasma bulk properties are estimated. Occasionally, the backscattered radar power is enhanced several orders of magnitude above the thermal backscatter level. These enhancements occur during naturally disturbed ionospheric conditions and in ionospheric modi_cation experiments, where a powerful radio wave is incident on the ionospheric plasma. In both of the cases the non-linearity is though

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16

Homam, Mariyam Jamilah. "Radiowave propagation in the polar ionosphere." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/10812.

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A dual-frequency GPS receiver, GSV4004B, has been installed at Alert, Canada since May 2008 to study the ionospheric variability at a high-latitude location. This Ionospheric Scintillation and TEC Monitor (GISTM) receiver is able to measure amplitude and phase scintillation, and also Total Electron Content (TEC). In addition, a High Frequency (HF) link has been established from Qaanaaq to Svalbard since March 2009 to study the channel characteristics, including Doppler spreads. This study covers from end of May 2008 to February 2011 where it was mostly during the minimum state of solar activit

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17

Denton, Michael Harold. "Thermal balance of the topside ionosphere." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341853.

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18

Chatain, Audrey. "Aerosols-plasma interaction in Titan’s ionosphere." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASV022.

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Le système climatique de la lune de Saturne Titan est gouverné par la production intense d’aérosols organiques dans sa haute atmosphère. Ce phénomène s’est aussi certainement produit sur Terre au moment de l’apparition de la vie. Ces deux points motivent fortement les recherches sur les processus de formation et d’évolution des aérosols dans l’atmosphère de Titan. Les aérosols se forment et restent plusieurs semaines dans l’ionosphère, étendue d’environ 900 à 1200 km d’altitude. Cette région de l’atmosphère est ionisée par le rayonnement solaire UV et des particules énergétiques provenant de l

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19

Barjatya, Aroh. "Langmuir Probe Measurements In The Ionosphere." DigitalCommons@USU, 2007. https://digitalcommons.usu.edu/etd/274.

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Electric probes have been the primary instruments for the in situ investigation of plasma parameters in the Earth’s ionosphere. This dissertation is a compendium of three papers, each dealing with a separate spacecraft that carried one or more instruments based on the electric probe technique. The ﬁrst paper presents data from the Sudden Atom Layer sounding rocket that carried an RF Impedance Probe, a DC ﬁxed-bias Langmuir Probe (DCP), and an Electric Field Probe. The combined dataset indicates a case of payload surface charging, the causes of which are investigated within the paper. A generic

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20

Jacobi, Christoph, and Dierk Kürschner. "Interannual variability of the quasi two-day wave over Central Europe (52°N, 15°E)." Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-223179.

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Using the spaced receiver method in the low-frequency (LF) range, lower E-region ionospheric drifts are measured at Collm Observatory, Germany since several decades. These drifts are interpreted as upper mesospheric winds at the reflection height of the used amplitude modulated LF radio waves, the latter being measured since 1983 using travel time differences between the ground wave and the ionospherically reflected sky wave within a small sideband range near 1.8 kHz above and below the carrier frequency. One regular feature of midlatitude upper mesosphere winds is the quasi twoday wave (QTDW)

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21

Mbambo, Makhangela Casey. "Variability of the peak height of the ionospheric F2 layer over South Africa." Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/446.

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Abstract This thesis will present an investigation into the variability of the maximum height of the ionospheric F2 layer, hmF2, with hour, season and latitude over the South African region. The dependence of hmF2 on solar and magnetic activity is also investigated. Data from three South African stations, namely Madimbo (22.4 S, 26.5 E), Grahamstown (33.3 S, 26.5 E) and Louisvale (28.5 S, 21.2 E) were used in this study. Initial results indicate that hmF2 shows a larger variability around midnight than during daytime for all the seasons. Monthly median values for hmF2 were used in all cases to

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22

De, Larquier Sebastien. "The mid-latitude ionosphere under quiet geomagnetic conditions: propagation analysis of SuperDARN radar observations from large ionospheric perturbations." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/24770.

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The Earth's ionosphere is a dynamic environment strongly coupled to the neutral atmosphere, magnetosphere and solar activity. In the context of this research, we restrict our interest to the mid-latitude (a.k.a., sub-auroral) ionosphere during quiet geomagnetic conditions. The Super Dual Auroral Radar Network (SuperDARN) is composed of more than 30 low-power High Frequency (HF, from 8-18 MHz) Doppler radars covering the sub-auroral, auroral and polar ionosphere in both hemispheres. SuperDARN radars rely on the dispersive properties of the ionosphere at HF to monitor dynamic features of the ion

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23

Singh, Dupinder. "Study of ionospheric variabilities in the equatorial and low latitude region." Thesis, IIG, 2010. http://localhost:8080/xmlui/handle/123456789/1591.

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24

Jacobi, Christoph, and Dierk Kürschner. "Ergebnisse ionosphärischer Messungen am Observatorium Collm während der totalen Sonnenfinsternis vom 11. 8.1999." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-215460.

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Während der Sonnenfinsternis am 11. 8. 1999 kam es zu einer kurzzeitigen starken Abnahme der Ionisation im Höhenbereich der D-Region (60-90 km Höhe) am Unterrand der Ionosphäre. Mit bodengebundenen funktechnischen Beobachtungen der Ausbreitung elektromagnetischer Wellen über die D-Region konnte dieses Ereignis in charakteristischer Weise als ein simulierter Tag-Nacht-Übergang mit allen zu erwartenden Konsequenzen beobachtet werden. Auf der Basis von Funkwellen-Ausbreitungsmessungen werden in Collm (51.3°N, 13°E) Windmessungen im Höhenbereich der Mesopause und unteren Thermosphäre (80-105 km) d

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25

Hoffmann, Peter, and Christoph Jacobi. "Response of the ionospheric total electron content to stratospheric normal modes." Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-223214.

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Globale Karten des totalen Elektronengehaltes (TEC) der Ionosphäre werden nach Signalen planetarer Wellenaktivität aus der Stratosphäre im Bereich der mittleren Breiten (ca. 52.5° N) untersucht, um eine Abschätzung über die vertikale Kopplung durch planetare Wellen (PW) zu erhalten. Die Variabilität der Ionosphäre wird operationell durch das DLR Neustrelitz erfasst. Seit 2002 werden zu diesem Zwecke hemisphärische TEC Karten erstellt, die eine Analyse PW typischer Oszillationen in der Ionosphäre ermöglichen. Die verwendete Methode zur Analyse separiert Wellen nach ihrer zonalen Wellenzahl, Per

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26

Hekman, Thomas P. "Far ultraviolet images of the nighttime ionosphere." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA275083.

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Thesis (M.S. in Systems Engineering (Electronic Warfare)) Naval Postgraduate School, September 1993.<br>Thesis advisor(s): David D. Cleary. "September 1993." Bibliography: p. 58. Also available online.

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27

Verronen, Pekka T. "Ionosphere-atmosphere interaction during solar proton events /." Helsinki : Finn. Meteorological Inst, 2006. http://www.gbv.de/dms/goettingen/520955706.pdf.

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28

Peters, Bevis Michael. "A Martian thermosphere : ionosphere general circulation model." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271688.

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29

Crowley, G. "Doppler radar studies of the Antarctic ionosphere." Thesis, University of Leicester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353168.

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30

Butler, Thomas W. "Spatial statistics and analysis of earth's ionosphere." Thesis, Boston University, 2013. https://hdl.handle.net/2144/10950.

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Thesis (Ph.D.)--Boston University<br>The ionosphere, a layer of Earths upper atmosphere characterized by energetic charged particles, serves as a natural plasma laboratory and supplies proxy diagnostics of space weather drivers in the magnetosphere and the solar wind. The ionosphere is a highly dynamic medium, and the spatial structure of observed features (such as auroral light emissions, charge density, temperature, etc.) is rich with information when analyzed in the context of fluid, electromagnetic, and chemical models. Obtaining measurements with higher spatial and temporal resolution i

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31

Gavrilov, Nikolaj M., Christoph Jacobi, and Dierk Kürschner. "Drifts and their short-period perturbations in the lower ionosphere observed at Collm during 1983 - 1999." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 17 = Meteorologische Arbeiten aus Leipzig ; 5 (2000), S. 74-87, 2000. https://ul.qucosa.de/id/qucosa%3A15150.

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Estimations of the intensity of short-period perturbations of the horizontal drift velocity at 80 - 110 km altitude are made using data from the regular low-frequency D1 ionospheric reflection observations at Collm, Germany (52° N, 15° E) for the period 1983 - 1999. A simple half-hourly-difference numerical filter is used to extract perturbations with time scales between 0.7 and 3 hours. The results are compared with the mean drift analyses in order to study the interaction between short-period perturbations and the mean circulation. The average monthly variances of short-period perturbations

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32

Pitkänen, T. (Timo). "Dynamics of the polar cap boundary and the auroral oval in the nightside ionosphere." Doctoral thesis, University of Oulu, 2011. http://urn.fi/urn:isbn:9789514294471.

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Abstract The high-latitude polar ionosphere is characterized by two regions, the polar cap and the auroral oval. In the polar cap, the geomagnetic field lines are open and connect to the solar wind, whereas the field lines in the auroral oval are closed and map to the plasma sheet and the plasma sheet boundary layer in the magnetosphere. The two substantially different magnetic and plasma domains are separated by a separatrix, the polar cap boundary (PCB), which is an ionospheric projection of the open-closed field line boundary (OCB) in the magnetosphere. In this thesis, a new method to deter

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33

Shytermeja, Enik. "Design and performance of a GNSS single-frequency multi-constellation vector tracking architecture for urban environments." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19756/1/SHYTERMEJA_Enik.pdf.

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In the last decade, Global Navigation Satellites Systems (GNSS) have gained a significant position in the development of urban navigation applications and associated services. The urban environment presents several challenges to GNSS signal reception, such as multipath and GNSS Line-of-Sight (LOS) blockage, which are translated in the positioning domain in a decreased navigation solution accuracy up to the lack of an available position. For this matter, Vector Tracking (VT) constitutes a promising approach able to cope with the urban environment-induced effects including multipath, NLOS recept

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34

Russell, Alexander J. B. "Coupling of the solar wind, magnetosphere and ionosphere by MHD waves." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/2571.

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The solar wind, magnetosphere and ionosphere are coupled by magnetohydrodynamic waves, and this gives rise to new and often unexpected behaviours that cannot be produced by a single, isolated part of the system. This thesis examines two broad instances of coupling: field-line resonance (FLR) which couples fast and Alfvén waves, and magnetosphere-ionosphere (MI-) coupling via Alfvén waves. The first part of this thesis investigates field-line resonance for equilibria that vary in two dimensions perpendicular to the background magnetic field. This research confirms that our intuitive understan

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35

Stolle, Claudia, Christoph Jacobi, Norbert Jakowski, Stefan Schlüter, and Armin Raabe. "Comparison of electron density profiles in the ionosphere from ionospheric assimilations of GPS, CHAMP profiling and ionosondes over Europe." Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-218294.

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GPS integrated Total Electron Content measurements received at the ground or in space are used for tomographic reconstruction of the ionospheric electron density distribution. The IRI/GCPM model is used as initialisation of the tomographic MART algorithm. During the procedure GPS TEC data are iteratively assimilated to the model. To test the potential of the reconstruction, electron density profiles from IRI/GCPM and the assimilation are compared with ionosonde measurements and CHAMP radio occultation profiles for dates during the HIRAC campaign in April 2001. All profiling methods show electr

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36

Stolle, Claudia, Stefan Schlüter, Christoph Jacobi, and Norbert Jakowski. "Ionospheric tomography and first interpretations of including space-based GPS." Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-217058.

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When L-band radio waves of space-based radio navigation systems such as Global Positioning System (GPS) travel through the atmosphere and ionosphere, their ray paths are bent and their travel time are increased as a result of refractive-index gradients. As the ionosphere is a dispersive medium the two GPS frequencies are subject to different delays in time and modifications in amplitude, phase and polarisation which is an effect of free electrons. By using these two radio frequencies one can derive information about the Total Electron Content integrated along the ray path. After calibration, t

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37

Stolle, Claudia, Stefan Schlüter, Christoph Jacobi, Norbert Jakowski, and Armin Raabe. "Monitoring of a polar plasma convection event with GPS." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 30 = Meteorologische Arbeiten aus Leipzig ; 8 (2003), S. 112-120, 2003. https://ul.qucosa.de/id/qucosa%3A15240.

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When L-band radio waves of space based systems such as Global Positioning System (GPS) travel trough the ionosphere and plasmasphere their ray paths are perturbed due to the free electrons. Since the last decade these integrated measurements are used to map the ionosphere for navigational and scientific investigations. In November 2001 a polar plasma convection like ionospheric event has been recognised in vertical TEC maps produced with GPS data. This event on the one hand is shortly compared with the behaviour of the Interplanetary Magnetic Field (IMF) to which it may be related according to

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38

Okoh, Daniel Izuikeninachi. "Developing an ionospheric map for South Africa." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005244.

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This thesis describes the development of an ionospheric map for the South African region using the current available resources. The International Reference Ionosphere (IRI) model, the South African Bottomside Ionospheric Model (SABIM), and measurements from ionosondes in the South African Ionosonde Network, were incorporated into the map. An accurate ionospheric map depicting the foF2 and hmF2 parameters as well as electron density profiles at any location within South Africa is a useful tool for, amongst others, High Frequency (HF) communicators and space weather centers. A major product of t

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39

Edwards, Thomas Raymond. "Empirical Ionospheric Models: The Road To Conductivity." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/100284.

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The Earth's polar ionosphere is a highly dynamic region of the upper atmosphere, and acts as the closure of the greater magnetospheric current system. This region plays host to many electrodynamic effects that impact terrestrial systems, such as power grids, railroads, and pipelines. These effects are fundamentally related to the currents, electric fields, and conductivity present in the polar ionosphere. Understanding and predicting the electrodynamics of this region is vital to being able to determine the physical impacts on terrestrial systems and provide predictions to government and comme

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40

Sibanda, Patrick. "Particle precipitation effects on the South African ionosphere." Thesis, Rhodes University, 2007. http://hdl.handle.net/10962/d1005267.

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Particle precipitation involves the injection of energetic particles into the ionosphere which could increase the ionisation and conductivity of the upper atmosphere. The goal of this study was to examine the ionospheric response and changes due to particle precipitation in the region over South Africa, using a combination of groundbased and satellite instruments. Particle precipitation events were identified from satellite particle flux measurements of the Defence Meteorological Satellite Program (DMSP). Comprehensive studies were done on the events of 5 April, 2000 and 7 October, 2000. Analy

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41

Wild, James. "Electrodynamics of the auroral ionosphere during magnetospheric substorms." Thesis, University of Leicester, 2000. http://hdl.handle.net/2381/30641.

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One of the principal consequences of magnetic reconnection at the dayside magentopause is the transfer of solar wind energy in the Earth's magnetotail. The expansion phase of a magnetospheric substorm corresponds to the sudden release of this energy and is characterised in the ionosphere by the sudden brightening and poleward expansion of the auroral oval near midnight and the intensification of the ionospheric currents flowing in the auroral zone. Observations of various high-latitude ionospheric phenomena associated with magnetospheric substorm are presented. In particular, use is made of th

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42

Wild, Paul. "Dynamics of particle precipitation in the auroral ionosphere." Thesis, Lancaster University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.654965.

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43

Talaee, Omid. "Distribution of Electron Temperatures in Titan's Lower Ionosphere." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-194685.

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The report contained herein is a statistical analysis of electron temperatures withinTitan’s lower ionosphere. Electron temperatures in this altitudinal range are of greatimport for researchers. The main contributing factors are investigated to see whatphysical processes are the sources of variability in electron temperatures. Oneimportant result from this analysis lends itself to determining recombinationcoefficients thus determining organic process rates occurring within Titan’satmosphere. To accomplish this analysis, data from the Langmuir probe aboard the Cassini craft isutilized. The Lang

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Davies, Jacqueline Anne. "Ion frictional heating in the high-latitude ionosphere." Thesis, University of Leicester, 1996. http://hdl.handle.net/2381/35864.

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At auroral latitudes, large electric fields drive the F-region plasma of the ionosphere through the thermosphere, heating the ion population through frictional contact with the neutral gas. Ion frictional heating, which can double the unperturbed ion temperature, is an important manifestation of both magnetosphere-ionosphere and ionosphere-thermosphere interaction and provides a significant contribution to the energy budget of the ionosphere and neutral atmosphere at high-latitudes. Perhaps the single most powerful technique for ground based remote sensing of the ionosphere is incoherent scatt

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Nichols, Jonathan D. "Magnetosphere-ionosphere coupling currents in Jupiter's middle magnetosphere." Thesis, University of Leicester, 2004. http://hdl.handle.net/2381/30679.

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This thesis is a theoretical study of the magnetosphere-ionosphere coupling current system in Jupiter's middle magnetosphere associated with the breakdown of corotation of iogenic plasma and the jovian main auroral oval. The study initially investigates the effects of the ionospheric Pedersen conductivity and the iogenic plasma mass outflow rate. Wide ranges of values of these parameters are inputted to the model and the results are compared for dipole and current sheet field models. It is shown that previous results, obtained using 'reasonable' spot values, are generally valid over wide range

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Wilder, Frederick Durand. "Reverse Convection Potential Saturation in the Polar Ionosphere." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31847.

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The results of an investigation of the reverse convection potentials in the day side high latitude ionosphere during periods of steady northward interplanetary magnetic field (IMF) are reported. While it has been shown that the polar cap potential in the ionosphere exhibits non-linear saturation behavior when the IMF becomes increasingly southward, it has yet to be shown whether the high latitude reverse convection cells in response to increasingly northward IMF exhibit similar behavior. Solar wind data from the ACE satellite from 1998 to 2005 was used to search for events in the solar wind wh

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Mao, Xiaolei. "GPS CARRIER SIGNAL PARAMETERS ESTIMATION UNDER IONOSPHERE SCINTILLATION." Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1314295002.

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Wang, Jun. "SPECTRAL CHARACTERIZATION OF IONOSPHERE SCINTILLATION: ALGORITHMS AND APPLICATIONS." Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1385774581.

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Wohlwend, Christian Stephen. "Modeling the Electrodynamics of the Low-Latitude Ionosphere." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/11.

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The electrodynamics of the Earth's low-latitude ionosphere is dependent on the ionospheric conductivity and the thermospheric neutral density, temperature, and winds present. This two-part study focused on the gravity wave seeding mechanism of equatorial plasma depletions in the ionosphere and the associated equatorial spread F, as well as the differences between a two-dimensional flux tube integrated electrodynamics model and a three-dimensional model for the same time period. The gravity wave seeding study was based on a parameterization of a gravity wave perturbation using a background empi

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Nayak, Chinmaya Kumar. "Study of the variability of equatorial and low latitude ionosphere in the Indian region using radio waves." Thesis, Indian Institute of Geomagnetism, Mumbai, 2013. http://localhost:8080/xmlui/handle/123456789/215.

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A thesis submitted to the University of Mumbai for the Ph.D (Science) Degree in Physics under the guidance of Dr. Satyavir Singh.<br>This thesis addresses three different aspects of the equatorial ionosphere during a period of extended solar minimum (2007-2009). Chapter I gives a detailed introduction to various features of the equatorial ionosphere while the chapters II, III, and IV discusses the work done during the course of this thesis. In this chapter, the summary and conclusions of the research work presented in the thesis have been discussed, with the scope for the future investigations

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