Thèses sur le sujet « Ionospheric waves »
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Borderick, James David. « Ionospheric signatures of ultra low frequency waves ». Thesis, University of Leicester, 2011. http://hdl.handle.net/2381/9170.
Texte intégralNorton, 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.
Texte intégralMaster of Science
The thermosphere and ionosphere are impacted by many sources. The sun and the magnetosphere externally impact this system. Planetary waves, which originate in the lower atmosphere, internally impact this system. This interaction leads to periodic signatures in the ionosphere that reflect periodic signatures seen in the lower atmosphere, the sun and the magnetosphere. This study identifies these times of similar oscillations in the neutral atmosphere, the ionosphere, and the sun, in order to characterize these interactions. Events are cataloged through wavelet analysis and thresholding techniques. Using a time-span of 17 years, trends are identified using histograms and percentages. From these trends, the characteristics of this coupling can be concluded. This study is meant to confirm the theory and provide new insights that will hopefully lead to further investigation through modeling. The goal of this study is to gain a better understanding of the role that planetary waves have on the interaction of the atmosphere and the ionosphere.
Thomas, Edwin Christopher. « Phase and amplitude variations in the wave fields of ionospherically reflected radio waves ». Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/35807.
Texte intégralTakiguchi, Yu. « Emission of whistler waves from an ionospheric tether ». Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54621.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references (p. 121-122).
In this thesis, we analyze how electromagnetic waves propagate in ionosphere around the earth which is magnetized plasma. We calculate the electromagnetic wave field made by a dipole antenna at an arbitrary observation point far from the antenna using the Stationary Phase Method. With this wave field, wave energy flux is calculated, and by integrating this wave energy flux on the sphere around the antenna, the radiation resistance of this antenna is computed. We compare the results with some past analytical and experimental works. We also analyze the wave propagation characteristics. The wave propagation ways are different for different wave frequencies. We precisely analyze this different wave propagation ways by analyzing the group velocity and k surface of the wave. There are intense radiation directions. We discuss the nature of these intense radiation directions and compare the characteristics with the past works. There are spatial oscillations of wave fields and wave energy flux. We also discuss the reason of this oscillation and compare with the past works.
by Yu Takiguchi.
S.M.
Löfås, Henrik. « Ionospheric modification by powerful HF-waves : Underdense F-region heating by X-Mode ». Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-121898.
Texte intégralFrissell, Nathaniel A. « Ionospheric Disturbances : Midlatitude Pi2 Magnetospheric ULF Pulsations and Medium Scale Traveling Ionospheric Disturbances ». Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/74976.
Texte intégralPh. D.
Kalkavage, Jean Hogan. « Nonlinear wave-wave interactions in ionospheric plasmas caused by injected VLF and HF waves ». Thesis, Boston University, 2014. https://hdl.handle.net/2144/21184.
Texte intégralThe study of wave-wave interactions in the ionosphere is important for designing communication systems, satellite systems, and spacecraft. Ionospheric research also informs laser and magnetic fusion plasma physics. This thesis focuses on two nonlinear wave-wave interactions in the ionosphere. The first interaction is a nonlinear mode conversion. Very Low Frequency (VLF) waves transmitted from the ground travel through the ionosphere as injected whistler waves. The whistler waves interact with naturally-occurring density fluctuations in the ionosphere and are mode converted into lower hybrid waves. The lower hybrid waves accelerate electrons along the geomagnetic field and the resulting beam mode Langmuir waves are detectable by radar. This type of mode conversion may combine additively with a four wave interaction with the same VLF wave as its source. Data collected at the Arecibo Observatory in Puerto Rico during the occurrence of spread F and sporadic E was analyzed. Plasma line enhancements may indicate the nonlinear mode conversion both separately from and in conjunction with the four wave interaction. The second nonlinear wave-wave interaction is the parametric decay instability (PDI) excited by High Frequency (HF) heater waves at the High Frequency Active Auroral Research Program facility in Gakona, Alaska. Resonant PDI cascades downwards, resulting in up-shifted ion line enhancements as detected by radar. This process has been detected in the presence of down-shifted ion line enhancements which may be caused by beating between PDI-produced Langmuir waves, or by naturally occurring ionospheric currents.
2031-01-01
Negale, Michael. « Investigating the Climatology of Mesospheric and Thermospheric Gravity Waves at High Northern Latitudes ». DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/6937.
Texte intégralYang, Heng 1985. « On the detection of ionospheric waves, relationship with earthquakes and tsunamis ». Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667175.
Texte intégralEsta tesis aborda la detección y caracterización de las ondas ionosféricas y su aplicación a las perturbaciones ionosféricas itinerantes (TID traveling ionospheric disturbances) inducidas por eventos naturales. La caracterización se realiza a partir de mapas regionales de Contenido Total Vertical de Electrones (VTEC) que se obtienen a partir de medidas de un conjunto de satélites del Sistema Navegación GNSS (Global Navigation Satellite System). Obsérvese que, desde el punto de vista matemático y de procesamiento de señales, el problema presenta dos dificultades: a) el hecho de que el muestreo ionosférico no es uniforme, con una densidad de muestras diferente que refleja de alguna manera la distribución de las estaciones sobre la superficie terrestre, y b) el hecho de que el método de estimación no puede introducir ninguna limitación en el número de perturbaciones y sus parámetros de propagación a detectar. En la primera contribución de la tesis, proponemos un método para detectar el número de TIDs simultáneas de una serie temporal de mapas VTEC filtrados por paso alto y sus parámetros. El método, al que denominamos como el Detector de Descomposición Atómica de TIDs (ADDTID), lo probamos con mapas VTEC, que corresponden a un escenario realista simulado en la red GEONET en Japón. La contribución consiste en la detección del número exacto de TIDs independientes a partir de un muestreo no uniforme de los IPPs de la ionosférica. La solución al problema se establece como la estimación de las perturbaciones representativas a partir de un diccionario de átomos que abarcan un espacio lineal de posibles TIDs mediante una variación del algoritmo LASSO. Estos átomos consisten en ondas planas caracterizadas por una longitud de onda, dirección y fase en una superficie definida. Como segunda contribución, aplicamos ADDTID a los datos VTEC a la red GEONET. Para probar el método, hemos estudiado los MSTIDs durante el día del Equinoccio de Primavera del 21 de marzo de 2011. La contribución geofísica es: (a) la detección de ondas circulares MSTID compatibles por tiempo y centro con un terremoto específico; (b) la superposición simultánea de dos MSTID distintos, con casi el mismo acimut; y (c) la presencia durante la noche de MSTID con velocidades en el rango de 400-600 m/s. En la tercera contribución presentamos una caracterización detallada de los TIDs originados por el eclipse solar total del 21 de agosto de 2017, cuya sombra atravesó los Estados Unidos desde el Pacífico hasta el Océano Atlántico. La evolución temporal de las TID producidas por el eclipse, que dependen del ángulo vertical del sol con la superficie de la tierra, y también aparece en un fenómeno de doble onda de choque. Finalmente, detectamos un patrón claro de MSTIDs, que aparecieron antes de la llegada de la penumbra, lo que podríamos hipotetizar como ondas de solitón asociadas con la onda de choque. En la cuarta contribución caracterizamos los MSTIDs generados durante el terremoto de Tohoku en Japón el 11 de marzo de 2011. Lo encontramos: a) una confirmación de la prestación del algoritmo frente al multi-TID simultáneas, la robustez frente a la curvatura de los frentes de onda de las perturbaciones y la precisión en la estimación de los parámetros. Los resultados se verificaron por duplicado mediante la inspección visual adicional de los mapas de VTEC y de los diagramas de keogramas; b) la detección de diferentes frentes de onda entre los MSTID del oeste y del este en torno al epicentro, coherentes en el tiempo y en el espacio con el maremoto posterior al terremoto; c) la evolución completa de las MSTID circulares que impulsó el maremoto durante el período observable en la zona de observación de los GNSS; y d) la detección de las MSTID circulares cortas y rápidas en el espacio en relación con las ondas acústicas asociadas con el terremoto.
Hoffmann, Peter, et Christoph Jacobi. « Analysis of planetary waves seen in ionospheric total electron content (TEC) perturbations ». Universität Leipzig, 2006. https://ul.qucosa.de/id/qucosa%3A15490.
Texte intégralThe DLR Neustrelitz regularly produces maps of the total total electron content (TEC) on a global scale using the navigation satellite systems GPS and GLONASS to forecast space weather. In this study we turn our attention to the higher middle latitudes TEC variations during September to November 2004 in a long-period range of several days with a zonal wavenumber up to 5. The results are compared with a planetary wave analysis using assimilated stratospheric data, mesosphere/lower thermosphere radar temperature data at Collm observatory (51.3◦N, 13.0◦E) and the ionosonde observed critical plasma frequency of the F2-layer (f0F2) at Juliusruh (54.6◦N, 13.4◦E) to investigate the meteorological influences on ionospheric variability.
Hoffmann, Peter, et Christoph Jacobi. « Analysis of planetary waves seen in ionospheric total electron content (TEC) perturbations ». Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-221930.
Texte intégralThe DLR Neustrelitz regularly produces maps of the total total electron content (TEC) on a global scale using the navigation satellite systems GPS and GLONASS to forecast space weather. In this study we turn our attention to the higher middle latitudes TEC variations during September to November 2004 in a long-period range of several days with a zonal wavenumber up to 5. The results are compared with a planetary wave analysis using assimilated stratospheric data, mesosphere/lower thermosphere radar temperature data at Collm observatory (51.3◦N, 13.0◦E) and the ionosonde observed critical plasma frequency of the F2-layer (f0F2) at Juliusruh (54.6◦N, 13.4◦E) to investigate the meteorological influences on ionospheric variability
Tshisaphungo, Mpho. « Validation of high frequency propagation prediction models over Africa ». Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1015239.
Texte intégralRussell, 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.
Texte intégralMoeketsi, Daniel Mojalefa. « Solar cycle effects on GNSS-derived ionospheric total electron content observed over Southern Africa ». Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1005275.
Texte intégralShi, Xueling. « Occurrence Statistics and Driving Mechanisms of Ionospheric Ultra-Low Frequency Waves Observed by SuperDARN Radars ». Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/100904.
Texte intégralDoctor of Philosophy
Starks, Michael James 1971. « Measurement of the conjugate propagation of VLF waves by matched filter and application to ionospheric diagnosis ». Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80126.
Texte intégralIncludes bibliographical references (p. 173-176).
by Michael James Starks.
Sc.D.
Pradipta, Rezy. « Generation of acoustic-gravity waves in ionospheric HF heating experiments : simulating large-scale natural heat sources ». Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/79031.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references (p. 203-208).
In this thesis, we investigate the potential role played by large-scale anomalous heat sources (e.g. prolonged heat wave events) in generating acoustic-gravity waves (AGWs) that might trigger widespread plasma turbulence in the ionospheric layer. The main hypothesis is that, the thermal gradients associated with the heat wave fronts could act as a source of powerful AGW capable of triggering ionospheric plasma turbulence over extensive areas. In our investigations, first we are going to examine a case study of the summer 2006 North American heat wave event. Our examination of GPS-derived total electron content (TEC) data over the North American sector reveals a quite noticeable increase in the level of daily plasma density fluctuations during the summer 2006 heat wave period. Comparison with the summer 2005 and summer 2007 data further confirms that the observed increase of traveling ionospheric disturbances (TIDs) during the summer 2006 heat wave period was not simply a regular seasonal phenomenon. Furthermore, a series of field experiments had been carried out at the High-frequency Active Auroral Research Program (HAARP) facility in order to physically simulate the process of AGW/TID generation by large-scale thermal gradients in the ionosphere. In these ionospheric HF heating experiments, we create some time-varying artificial thermal gradients at an altitude of 200-300 km above the Earth's surface using vertically-transmitted amplitude-modulated 0-mode HF heater waves. For our experiments, a number of radio diagnostic instruments had been utilized to detect the characteristic signatures of heater-generated AGW/TID. So far, we have been able to obtain several affirmative indications that some artificial AGW/TID are indeed being radiated out from the heated plasma volume during the HAARP-AGW experiments. Based on the experimental evidence, we may conclude that it is certainly quite plausible for large-scale thermal gradients associated with severe heat wave events to generate some AGW which might induce widespread plasma turbulence far in space.
by Rezy Pradipta.
Ph.D.
Ivchenko, Nickolay. « Alfven Waves and Spatio-Temporal Structuring in the Auroral Ionosphere ». Doctoral thesis, KTH, Alfvénlaboratoriet, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3364.
Texte intégralNorin, Lars. « Secondary Electromagnetic Radiation Generated by HF Pumping of the Ionosphere ». Doctoral thesis, Uppsala universitet, Astronomi och rymdfysik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9393.
Texte intégralKim, Tony C. « Interaction of Very Low Frequency (VLF) and Extremely Low Frequency (ELF) Waves in the Ionospheric Plasma and Parametric Antenna Concept ». Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1486674973747427.
Texte intégralHall, Jan-Ove. « Interaction between Electromagnetic Waves and Localized Plasma Oscillations ». Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4282.
Texte intégralNordblad, Erik. « Opening New Radio Windows and Bending Twisted Beams ». Doctoral thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-158797.
Texte intégralDe, 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.
Texte intégralPh. D.
Barabash, Victoria. « Investigation of Polar Mesosphere Summer Echoes in Northern Scandinavia ». Doctoral thesis, Umeå University, Physics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-176.
Texte intégralThis PhD thesis deals with phenomena which are closely related to the unique thermal structure of the polar summer mesosphere, namely Polar Mesosphere Summer Echoes (PMSE). PMSE are strong radar echoes commonly observed by VHF MST radars from thin layers in the 80-90 km altitude interval at high latitudes during summer. They follow a seasonal pattern of abrupt appearance in late May and a gradual disappearance in mid-August. This period corresponds roughly to the time between the completion of the summer time cooling of the polar mesopause to the time of reversal of the mesospheric circulation to autumn condition. In this connection, PMSE are associated with the extremely low temperatures, i.e. below 140 K, which are unique to the polar summer mesopause. Traditional theories of radar (partial) reflection and scattering have been unable to explain the PMSE and the exact mechanism for their occurrence remains unclear despite the steadily increasing interest in them over the past 20 years. Currently accepted theories regarding the mechanism giving rise to PMSE agree that one of the conditions needed for enhanced radar echoes is the presence of low-mobility charge carries such as large cluster ions and ice aerosols which capture the ambient electrons. It has been established that the PMSE are in some way associated with noctilucent clouds (NLC), layers of ice crystals, which constitute the highest observed clouds in the earth’s atmosphere. PMSE occurrence and dynamics are also found to be closely connected with the planetary and gravity waves.
Observations of PMSE presented in this thesis have been carried out by the Esrange MST radar (ESRAD) located at Esrange (67°56’N, 21°04’E) just outside Kiruna in northernmost Sweden. The radar operates at 52 MHz with 72 kW peak power and a maximum duty cycle of 5%. The antenna consists of 12x12 array of 5-element Yagis with a 0.7l spacing. During the PMSE measurements the radar used a 16-bit complementary code having a baud length of 1mS. This corresponds to height resolution of 150 m. The sampling frequency was set at 1450 Hz. The covered height range was 80-90 km. The presence of PMSE was determined on the basis of the radar SNR (signal-to-noise ratio). The PMSE measurements have been made during May-August each year since 1997.
PMSE seasonal and diurnal occurrence rates as well as dynamics have been studied in connection with tidal winds, planetary waves, temperature and water vapor content in the mesosphere (Papers I, IV and VI). Simultaneous and common-volume observations of PMSE and noctilucent clouds have been performed by radar, lidar and CCD camera (Paper V). Correlation between variations in PMSE and variations in extra ionization added by precipitating energetic electrons or high-energy particles from the Sun has been examined (Papers II and III). Possible influence of transport effects due to the electric field on PMSE appearance has been studied during a solar proton event (Paper III).
Oronsaye, Samuel Iyen Jeffrey. « Updating the ionospheric propagation factor, M(3000)F2, global model using the neural network technique and relevant geophysical input parameters ». Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001609.
Texte intégralBotai, Ondego Joel. « Ionospheric total electron content variability and its influence in radio astronomy ». Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005258.
Texte intégral黃元華 et Yuen-wah Wong. « A study of atomospheric gravity waves in East Asia by investigation oftheir effects upon the ionosphere ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31232875.
Texte intégralWong, Yuen-wah. « A study of atomospheric gravity waves in East Asia by investigation of their effects upon the ionosphere / ». [Hong Kong : University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13148424.
Texte intégralMercer, Christopher Crossley. « The search for an ionospheric model suitable for real-time applications in HF radio communications ». Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1005274.
Texte intégralCarozzi, Tobia. « Radio waves in the ionosphere : Propagation, generation and detection ». Doctoral thesis, Uppsala universitet, Institutionen för astronomi och rymdfysik, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1184.
Texte intégralBond, Giles Edward. « The interaction of radio waves with the auroral ionosphere ». Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30629.
Texte intégralCarozzi, Tobia D. « Radio waves in the ionosphere : propagation, generation, and detection / ». Uppsala : Institutionen för astronomi och rymdfysik, Univ. [distributör], 2000. http://publications.uu.se/theses/99-3364278-2/.
Texte intégralHoffmann, Peter, et Christoph Jacobi. « Connection of Planetary Waves in the Stratosphere and Ionosphere by the Modulation of Gravity Waves ». Universität Leipzig, 2010. https://ul.qucosa.de/id/qucosa%3A16359.
Texte intégralEin möglicher Zusammenhang zwischen dem Auftreten planetarer Wellen (PW) und typischer Oszillationen planetarer Wellen (PWTO) der Ionosphäre in mittleren Breiten wird auf der Basis von Analysen stratosphärischer Reanalysen und Karten des Gesamtelektronengehalts untersucht. Obwohl das saisonale Verhalten ähnlich erscheint, kann die Kopplung nur auf indirektem Wege erfolgen, wie z.B. durch die Modulation von Schwerewellen (GW) durch PW. Die für die Analysen notwendigen Informationen über GW können aus Temperaturprofilen (30-130 km), abgeleitet von Satellitenbeobachtungen (z.B. SABER), durch die Bestimmung der potentiellen Energie von GW, gewonnen werden. Zusammengefasst in täglichen Daten (2003-07-19 to 2005-07-20) stellen Proxies stationärer und wandernder PW ein vereinfachtes Bild des Prozesses der Modulation durch PW dar. Die Ergebnisse zeigen, dass sich PW selbst nicht bis in die unteren Thermosphäre ausbreiten können. Jedoch die Signatur, getragen durch GW, könnte auf diesem Wege als PWTO abgebildet werden.
Hahlin, Axel. « Coupled waves as a model to describe chaotic turbulence pumped by radio waves in the ionosphere ». Thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-356265.
Texte intégralStudier av plasmaturbulens i jonosfären som pumpas av kraftfulla radiovågor antyder att turbulensen är kopplat till deterministiskt kaos. För att undersöka möjligheten för deterministiskt kaos i jonosfären studeras kopplade vågsystem om de kan innehålla kaotiska regimer. Om dessa system visar kaotiskt beteende skulle de kunna användas för att beskriva kaos i jonosfären. Resultatet visade att kaos var närvarande i de kopplade vågsystem som studerats, för att verifiera om de kan användas för att beskriva kaos i jonosfären måste närmare studier av de parametrar som modellen använder sig av göras för att se om de faller inom ett intervall där kaos uppstår.
Hoffmann, Peter. « Planetary Wave Coupling between Stratosphere and Ionosphere by Gravity Wave Modulation ». Doctoral thesis, Universitätsbibliothek Leipzig, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-71533.
Texte intégralStocker, Alan John. « Modification of the ionosphere by means of high power radio waves ». Thesis, University of Leicester, 1990. http://hdl.handle.net/2381/35799.
Texte intégralGarg, Vidur. « Swept Neutral Pressure Instrument (SNeuPI) : Investigating Gravity Waves In The Ionosphere ». Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/56592.
Texte intégralMaster of Science
Hoffmann, Peter, et 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.
Texte intégralThe response of stratospheric planetary wave (PW) activity over the higher middle latitudes (ca. 52.5° N) in global gridded ionospheric data of the total electron content (TEC) are investigated to estimate the vertical coupling by PW. The monitoring of ionospheric variability is regularly operated by DLR Neustrelitz since 2002 producing TEC maps covering the northern hemisphere. This data base is considered for comparing simultaneous observations of wave activity in both stratosphere and ionosphere. The analysis technique of planetary wave type oscillations (PWTO) is carried out by separating waves into their zonal wavenumber, period and travelling direction. A previous case study of autumn 2004 has shown that among other things the quasi 6-day wave (m2w) is visible in the mean spectrum of stratospheric geopotential height at 1 hPa pressure level and of ionospheric TEC data. The actual results give hints for a simultaneous occurrence of this wave type with a quasi 6-day oscillation in the mesopause region. But in comparison to the stratosphere, the wave signatures seem to be somewhat schifted and modified
Meyer, Melissa G. « Remote sensing of localized ion acoustic waves with multistatic passive radar / ». Thesis, Connect to this title online ; UW restricted, 2006. http://hdl.handle.net/1773/6062.
Texte intégralOpperman, B. D. L. « Reconstructing ionospheric TEC over South Africa using signals from a regional GPS network ». Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1005273.
Texte intégralCannon, Patrick. « Numerical simulation of wave-plasma interactions in the ionosphere ». Thesis, Lancaster University, 2016. http://eprints.lancs.ac.uk/80076/.
Texte intégralDhillon, Ranvir Singh. « Radar studies of natural and artificial waves and instabilities in the auroral ionosphere ». Thesis, University of Leicester, 2002. http://hdl.handle.net/2381/30657.
Texte intégralHoffmann, Peter, et Christoph Jacobi. « Response of the ionospheric total electron content to stratospheric normal modes ». Universität Leipzig, 2007. https://ul.qucosa.de/id/qucosa%3A15572.
Texte intégralThe response of stratospheric planetary wave (PW) activity over the higher middle latitudes (ca. 52.5° N) in global gridded ionospheric data of the total electron content (TEC) are investigated to estimate the vertical coupling by PW. The monitoring of ionospheric variability is regularly operated by DLR Neustrelitz since 2002 producing TEC maps covering the northern hemisphere. This data base is considered for comparing simultaneous observations of wave activity in both stratosphere and ionosphere. The analysis technique of planetary wave type oscillations (PWTO) is carried out by separating waves into their zonal wavenumber, period and travelling direction. A previous case study of autumn 2004 has shown that among other things the quasi 6-day wave (m2w) is visible in the mean spectrum of stratospheric geopotential height at 1 hPa pressure level and of ionospheric TEC data. The actual results give hints for a simultaneous occurrence of this wave type with a quasi 6-day oscillation in the mesopause region. But in comparison to the stratosphere, the wave signatures seem to be somewhat schifted and modified.
Xi, Hong. « Theoretical and Numerical Studies of Frequency Up-shifted Ionospheric Stimulated Radiation ». Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29279.
Texte intégralPh. D.
Wohlwend, Christian Stephen. « Modeling the Electrodynamics of the Low-Latitude Ionosphere ». DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/11.
Texte intégralScoffield, Hannah Clare. « Ultra low frequency waves in the magentosphere-ionosphere system : a joint space- and ground-based investigation ». Thesis, University of Leicester, 2005. http://hdl.handle.net/2381/30692.
Texte intégralEltrass, Ahmed Said Hassan Ahmed. « The Mid-Latitude Ionosphere : Modeling and Analysis of Plasma Wave Irregularities and the Potential Impact on GPS Signals ». Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51804.
Texte intégralPh. D.
Gong, Yun. « Incoherent Scatter Study of Dynamics in the Ionosphere E- and F-Region at Arecibo ». Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1335235946.
Texte intégralKhotyaintsev, Yuri. « Alfvén Waves and Energy Transformation in Space Plasmas ». Doctoral thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3264.
Texte intégralNakanishi, Kunihito. « A study on magnetic fluctuations over the ionospheric E-region driven by the lower atmospheric phenomena ». 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215320.
Texte intégral