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Dissertations / Theses on the topic 'Low latitude ionosphere'

Author: Grafiati

Published: 6 September 2023

Last updated: 25 July 2025

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1

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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2

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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3

Sridharan, S. "Investigation of middle atmospheric winds, waves and tides from low latitudes." Thesis, IIG, 2002. http://localhost:8080/xmlui/handle/123456789/1604.

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A Thesis submitted to the Moanonmaniam Sundaranar University, Tirunelveli, in partial fulfilment of the requirements for the Ph.D. degree under the guidance of Dr. S. Gurubaran, Equatorial Geophysical Research Laboratory, Tirunelveli and Dr. N. Arunachalam, M.S. University, Tirunelveli

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4

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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5

Kakad, Bharati Amar. "Study of irregularities and dynamics of the low latitude ionosphere." Thesis, IIG, 2007. http://localhost:8080/xmlui/handle/123456789/1577.

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6

McDonald, Sarah E. "Day to day and longitudinal variability of the nighttime low latitude terrestrial ionosphere." Fairfax, VA : George Mason University, 2007. http://hdl.handle.net/1920/2956.

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Thesis (Ph. D.)--George Mason University, 2007.<br>Title from PDF t.p. (viewed Jan. 21, 2008). Thesis director: Michael E. Summers, Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Computational Sciences and Informatics. Vita: p. 204. Includes bibliographical references (p.193-203). Also available in print.

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7

Tracy, Brian David. "Lunar Tidal Effects in the Electrodynamics of the Low-Latitude Ionosphere." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1968.

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We used extensive measurements made by the Jicamarca Unattended Long-Term Investigations of the Ionosphere and Atmosphere (JULIA) and Incoherent Scatter Radar (ISR) systems at Jicamarca, Peru during geomagnetic quiet conditions to determine the climatologies of lunar tidal effects on equatorial vertical plasma drifts. We use, for the first time, the expectation maximization (EM) algorithm to derive the amplitudes and phases of the semimonthly and monthly lunar tidal perturbations. Our results indicate, as expected, lunar tidal effects can significantly modulate the equatorial plasma drifts. T

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8

Shim, JA Soon. "Analysis of Total Electron Content (TEC) Variations in the Low- and Middle-Latitude Ionosphere." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/403.

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Detailed study of the spatial correlations of day-to-day ionospheric TEC variations on a global scale was performed for four 30-day-long periods in 2004 (January, March/April, June/July, September/October) using observations from more than 1000 ground-based GPS receivers. In order to obtain the spatial correlations, initially, the day-to-day variability was calculated by first mapping the observed slant TEC values for each 5-minute GPS ground receiver-satellite pair to the vertical and then differencing it with its corresponding value from the previous day. This resulted in more than 150 mill

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9

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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10

Herne, David Edwin. "The Australian Mid-latitude Continental Ionosphere with Respect to Low-frequency Radio Astronomy." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/48581.

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The ionosphere above the Murchison Radio Observatory (MRO) has been characterised over half of solar cycle 24 and its response to impinging low-frequency radio waves described. The outcomes of this thesis will contribute to an operational requirement of the Murchison WideField Array (MWA) radio telescope (calibration) and delivery of the project’s scientific goals (high fidelity imaging) and shows that the MRO site is an excellent location from which to conduct low-frequency radio astronomy.

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11

Maurya, Ajeet Kumar. "ELF/VLF wave studies of ionosphere and magnetosphere electromagnetic phenomenon in low latitude region." Thesis, Indian Institute of Geomagnetism, Mumbai, 2013. http://localhost:8080/xmlui/handle/123456789/212.

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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. Rajesh Singh.<br>The present study provides the first detail description of morphological features of tweek radio atmospherics recorded at low latitude (L<1.3) Indian stations and their application in monitoring D-region or lower ionosphere during solar quiet (transition period of solar cycle 23 and 24) and eclipse conditions. This dissertation is also focused on long standing problem of propagation mechanism of low latitude whistlers. This work helps in advancing our knowledge of

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12

Davila, Ricardo Cruz. "A Study of Magnetic Activity Effects on the Thermospheric Winds in the Low Latitude Ionosphere." DigitalCommons@USU, 1994. https://digitalcommons.usu.edu/etd/6808.

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The purpose of this thesis is to examine the effects of magnetic activity on the low latitude F-region thermospheric winds. The F-region (120-1600 km) is a partially ionized medium where O+ and O are the major ion and neutral species, respectively. The thermospheric winds at these altitudes are driven primarily by pressure gradient forces resulting from the solar heating during the day and cooling at night. For this study, we use measured Fabry-Perot Interferometer (FPD winds at Arequipa (16.5°S, 71.5°W) and measured FPI and Incoherent Scatter Radar (ISR) winds at Arecibo (18.6°N, 66.8°W). Pre

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13

Ajith, K. K. "Studies on the evolution and dynamics of equatorial plasma bubbles (EPBs) using equatorial atmosphere radar (EAR)." Thesis, IIG, 2010. http://localhost:8080/xmlui/handle/123456789/1587.

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A Thesis submitted to the Andhra University, Andhra Pradesh for the degree of Doctor of Philosophy under the guidance of Dr. S. Tulasiram, Indian Institute of Geomagnetism and Prof. K. Niranjan, Andhra University

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14

Khadka, Sovit M. "Multi-diagnostic Investigations of the Equatorial and Low-latitude Ionospheric Electrodynamics and Their Impacts on Space-based Technologies." Thesis, Boston College, 2018. http://hdl.handle.net/2345/bc-ir:108001.

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Thesis advisor: Prof. Michael J. Naughton<br>Thesis advisor: Dr. Cesar E. Valladares<br>The equatorial and low-latitude ionosphere of the Earth exhibits unique features on its structuring, coupling, and electrodynamics that offer the possibility to forecast the dynamics and fluctuations of ionospheric plasma densities at later times. The scientific understanding and forecasting of ionospheric plasma are necessary for several practical applications, such as for mitigating the adverse effects of space weather on communication, navigation, power grids, space mission, and for various scientific ex

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15

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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16

Smith, Rasler W. "Low latitude ionospheric effects on radiowave propagation." Thesis, Monterey, California. Naval Postgraduate School, 1998. http://hdl.handle.net/10945/8638.

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This dissertation provides experimental observations and analyses that associate low-latitude transionospheric signal scintillation with transequatorial VHF radio propagation and errors in transionospheric geopositioning. The experiment observed equatorial-region ionospheric total electron content (TEC) derived from Global Positioning System (GPS) signals using receivers on Oahu, Hawaii, Christmas Island, and Rarotonga, Cook Islands. The experiment simultaneously measured VHF transequatorial propagation of VHF television signals from Hawaii to Rarotonga Analysis shows that a moving second mome

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17

Mohd, Ali Aiffah. "GNSS in aviation : ionospheric threats at low latitudes." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761026.

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Radio signals propagating through the ionised upper atmosphere (the ionosphere) in low latitude regions of the world can experience amplitude scintillation. This could threaten safety-critical applications of satellite navigation such as aviation. The research presented here studied the effects of amplitude scintillation on a Septentrio PolaRxS geodetic receiver and a Garmin 480 aviation receiver by means of a Spirent GNSS constellation simulator. Different types of fade profiles showed that an abrupt drop in signal strength caused a loss of lock on the signal more often than a profile with a

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18

Dubazane, Makhosonke Berthwell. "Modelling Ionospheric vertical drifts over the African low latitude region." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/63356.

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Low/equatorial latitudes vertical plasma drifts and electric fields govern the formation and changes of ionospheric density structures which affect space-based systems such as communications, navigation and positioning. Dynamical and electrodynamical processes play important roles in plasma distribution at different altitudes. Because of the high variability of E × B drift in low latitude regions, coupled with various processes that sometimes originate from high latitudes especially during geomagnetic storm conditions, it is challenging to develop accurate vertical drift models. This is despit

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19

Narayanan, V. Lakshmi. "Study of dynamical coupling of the mesosphere-lower thermosphere-ionosphere region at low latitudes." Thesis, Indian Institute of Geomagnetism, Mumbai, 2011. http://localhost:8080/xmlui/handle/123456789/223.

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20

Maruyama, Takashi. "Experimental and Theoretical study of Ionospheric Irregularities in the F Region at Low-Latitudes." Kyoto University, 1992. http://hdl.handle.net/2433/168763.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである<br>Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(工学)<br>乙第7875号<br>論工博第2585号<br>新制||工||878(附属図書館)<br>UT51-92-K375<br>(主査)教授木村磐根, 教授加藤進, 教授深尾昌一郎<br>学位規則第4条第2項該当

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21

PAIVA, JOSE ANTONIO GODINHO. "EFFECT OF THE IONOSPHERE OF LOW LATITUDES IN GPS - SBAS (GLOBAL SYSTEM POSITIONING - SPACE BASED AUGMENTATION SYSTEM)." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5863@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>A ionosfera de baixas latitudes tem características que poderiam causar problemas à operação do GPS/SBAS. Entre elas se encontra a anomalia equatorial, cuja densidade eletrônica pode apresentar intensos gradientes horizontais (e, portanto, no índice de refração do meio). Estes gradientes podem ser intensos o suficiente para introduzir erros nas previsões resultantes do GPS/SBAS. Para avaliar este problema, foi desenvolvido um programa de simulação em computador que integra modelos para: (i) a previsão das posições dos saté

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22

Matamba, Tshimangadzo Merline. "Long-term analysis of ionospheric response during geomagnetic storms in mid, low and equatorial latitudes." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/63991.

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Understanding changes in the ionosphere is important for High Frequency (HF) communications and navigation systems. Ionospheric storms are the disturbances in the Earth’s upper atmosphere due to solar activities such as Coronal Mass Ejections (CMEs), Corotating interaction Regions (CIRs) and solar flares. This thesis reports for the first time on an investigation of ionospheric response to great geomagnetic storms (Disturbance storm time, Dst ≤ −350 nT) that occurred during solar cycle 23. The storm periods analysed were 29 March - 02 April 2001, 27 - 31 October 2003, 18 - 23 November 2003 and

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23

Kumar, Sandeep. "Studies on equatorial and low latitude ionospheric electrodynamics and coupling processes during geomagnetically quiet and disturbed periods." Thesis, Indian Institute of Geomagnetism (IIG), 2016. http://localhost:8080/xmlui/handle/123456789/886.

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A thesis submitted to the University of Mumbai for the Ph.D.(Science) degree in physics under the guidance of Prof. B. Veenadhari<br>Conclusions : * There is a clear linear relationship between the ROCSAT-1 vertical E×B drifts and EEJ for both the sectors with a significant correlation coefficient. • The linear relationship between ROCSAT-1 measured E×B drifts and EEJ for Indian and Japanese sectors have been compared with Jicamarca Unattended Long-term Ionosphere At mosphere Radar (JULIA) radar (150 km echos) measured E×B drifts and EEJ strength form Peruvian sector. • It has been found t

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24

Aoyama, Tadashi. "A study on the origin of small-scale field-aligned currents as observed in topside ionosphere at middle and low latitudes." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225408.

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25

Tsunomura, Satoru. "On the Contribution of Global Scale Polar-originating Ionospheric Current Systems to Geomagnetic Disturbances in Middle and Low Latitudes." 京都大学 (Kyoto University), 1999. http://hdl.handle.net/2433/182006.

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26

Nishioka, Michi. "Study on meso-scale ionospheric structures at low-and mid-latitudes using data of GPS receiver networks and satellites." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124427.

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27

Riley, Peter. "Electrodynamics of the low-latitude ionosphere." Thesis, 1994. http://hdl.handle.net/1911/16768.

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We have undertaken a study of the low and mid latitude ionospheric electric field pattern, during both magnetospherically quiet and active periods. Our analysis can be conveniently split into two parts. i.In an effort to study the penetration of magnetospheric electric fields to low latitudes, we have compared Jicamarca F-region vertical drifts for 10 radar-observation periods with the auroral boundary index (ABI). The ABI is the latitude of the equatorward edge of the diffuse aurora at local midnight, as estimated from precipitating-electron fluxes measured from DMSP spacecraft. The periods o

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28

Yu-TingChou and 周育霆. "Study of Medium Scale Traveling Ionospheric Disturbance in Low-Latitude Ionosphere." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9g2vre.

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29

Lin, Chien-hung, and 林建宏. "Low-Latitude Ionosphere Variations during Magnetic Disturbances." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/59553923513793522097.

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博士<br>國立中央大學<br>太空科學研究所<br>93<br>The low latitude ionosphere is unique in that the magnetic field is nearly horizontal, so that zonal electric fields, produced by the neutral wind dynamo during quiet geomagnetic times, can transport the plasma vertically through the E×B drift. This quiet-time vertical drift is upward during the daytime, causing plasma to drift to higher altitudes, from where it diffuses down along magnetic fields to higher latitudes creating two plasma crests on both sides of the magnetic equator. This feature is called the equatorial ionization anomaly (EIA), and the effect

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Fang, Tzu-Wei, and 方慈瑋. "Model Simulation of the Low-latitude Ionosphere." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/4dmyep.

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博士<br>國立中央大學<br>太空科學研究所<br>97<br>The Earth’s upper atmosphere, comprised of the ionosphere and thermosphere, is where neutral and charged particles interact to cause complicated physical processes. It is partly because of the complexity that the region is still actively studied by scientists. The densities of charged particles show a significant variation with altitude, latitude, longitude, universal time, season, solar cycle, and magnetic activity. The variation results from changes in solar radiation and from the coupling and feedback mechanisms between the ionosphere-thermosphere system and

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Rajesh, PK, and 查傑希. "Airglow Investigations of the Low-Latitude Ionosphere." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/04728191182340097786.

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博士<br>國立中央大學<br>太空科學研究所<br>95<br>This dissertation focuses on the study of ionospheric irregularities using selected airglow emissions whose intensity is related to plasma density. All sky imaging technique is used to observe the large scale ionospheric structures, known as plasma depletions, which are often associated with Equatorial Spread-F (ESF) phenomena. The experiments conducted from Kavalur (12.5N, 78.8E; 4.6N geomagnetic), India, and Mt. Lulin (23.47N, 120.87E; 13.45N Geomagnetic), Taiwan are used in this work. The 630.0, 557.7, and 777.4 nm emissions are used for recording the ima

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32

湯宏武. "The Low-latitude Ionosphere Response during Magnetic Storm." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/75910898010635434166.

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碩士<br>國立中央大學<br>太空科學研究所<br>86<br>Low-latitude Ionosphere Tomography Network (LITN) was built in 1994. Till now, most of the research are related to theoretical study ; only a few are related to observational study. Therefore, this article try to study the variations of low-latitude ionosphere during the storm time by LITN. We also use the data of Kp and Dst index to compare with vertical total electron content(VTEC) of LITN .For the purpose of checking low-latitude ionosphere theories of VTEC as a function of latitude and time, the observational data of the Lunping station at Chungli are us

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Jia-TingLin and 林佳廷. "Impact of stratospheric sudden warmings on the low-latitude ionosphere." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/23389523589550322270.

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碩士<br>國立成功大學<br>太空天文與電漿科學研究所<br>100<br>In this thesis, modifications of the ionospheric tidal signatures during the 2008-2010 stratospheric sudden warming (SSW) events are studied by applying atmospheric tidal analysis to ionospheric electron densities observed using radio occultation soundings of FORMOSAT-3/COSMIC. The tidal analysis indicates that the zonal mean and major migrating tidal components (DW1, SW2 and TW3) decrease around the time of the SSW, with 1.5-4 hour time shifts in the daily time of maximum. The typical ionospheric SSW signature: a semi-diurnal variation of the ionospher

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34

Tsai, Hong Li, and 蔡宏利. "An Investigation of the Low Latitude Ionosphere Using the Tomographic Technique." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/13993941080271903829.

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Liu, Chung-Cheng, and 劉仲政. "Low- and Middle- Latitude Ionosphere F-region using DE-2 Data." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/73255834653106670478.

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碩士<br>國立中央大學<br>太空科學研究所<br>84<br>The Retarding Potential Analyzer (RPA) and Ion Drift Meter (IDM) onboard DE-2 satellite have provided the measurements of ion density and ion drift velocity at F-region ionosphere altitudes. Using the IDM data,we examine the average characteristics of the zonal and vertical plasma flows in the low-latitude region (< 50°MLAT) under the quiet geomagnetic conditions (Kp < 3). The data reveal that the zonal ion drifts are generally easrward at night,

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Wang, Cherng Jiow, and 王承就. "An Investigation of the low Latitude Ionosphere Reconstructed using the Tomographic data." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/96511250418322500783.

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Yu, Da-Chi, and 余大琪. "The Response of the Low-Latitude Ionosphere during the October 24, 1995 Solar Eclipse." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/11749422803611010293.

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碩士<br>國立中山大學<br>電機工程研究所<br>85<br>A solar eclipse offers a rare opportunity to observe how the sun affects the ionospheric structures. The main purpose of this paper is to study the ionospheric response to a solar eclipse that occurred in Asia on October 24, 1995. Although its path of totality passed over southern Asia, the associated region of partial eclipse covered almost all of Asia. We have collected ionosonde data from six stations in the region. Its purpose is to investigate how the ionosphere responded to this eclipse, especially because the region included the equatorial anomaly re

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Tu, Yuh-Min, and 涂裕民. "A Study of GPS Receiver Differential Code Biases and Low Latitude Area Ionosphere Model." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/22957732809891867500.

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博士<br>國立中興大學<br>土木工程學系所<br>101<br>The development of the Global Navigation Satellite Systems (GNSS), especially the widely established GPS ground stations, GPS has been widely used to investigate the ionosphere through the estimation of the Total Electron Content (TEC) and its distributions in space. One of the important factors affecting the ionosphere TEC estimation accuracy is the hardware differential code biases (DCB) inherited in both GPS satellites and receivers. This research investigates various factors affecting GPS receiver instrumental biases estimation accuracy. Through a number o

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Chin, Jo-lan, and 金若蘭. "Discuss the responses in the mid- and low- latitude ionosphere by ROCSAT-1 during storm events." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/54151225302968614447.

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碩士<br>國立中央大學<br>太空科學研究所<br>98<br>The ROCSAT-1 satellite was launched into a circular orbit at about 600km altitude with an inclination of 35 degrees, with which the globale responses of four magnetic storm events occurred on 2000/07/15, 2001/03/31, 2003/1029, 2003/11/20, respectively, were analyzed in the mid- and low-latitude ionosphere. The data of 50 days before storm onset were taken to construct the background conditions. According to the satellite pathes of the storm events, a division for dayside and nightside can be roughly defined. The daytime penetration electric fields, eastward re

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Chen, Jeng-Hung, and 陳政宏. "The Relationship Between the SENPOT Potential on ROCSAT-1 and the Environmental Conditions at Low Latitude Ionosphere." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/65s34g.

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碩士<br>國立中央大學<br>太空科學研究所<br>94<br>Abstract The ionospheric plasma and electrodynamics instrument (IPEI) onboard the ROCSAT-1 satellite consists of four sensors and a sensors potential circuit (SENPOT) on its aperture plane. The SENPOT is designed for minimizing the potential between the plasma and the sensor’s aperture plane to prevent from the surface potential effect on the ionized particles. The modulated potential by SENPOT varying with time is called the SENPOT potential. In this thesis, we use the SENPOT potential data to investigate the relationship between the satellite surface char

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Anand, Raj R. "Kalman Filter Estimation Of Ionospheric TEC And Differential Instrumental Biases Over Low Latitude Using Dual Frequency GPS Observations." Thesis, 2006. https://etd.iisc.ac.in/handle/2005/426.

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The low latitude tropical ionosphere has been investigated by various researchers using Global Positioning System (GPS). Presently for many civil aviation applications, the ionospheric modeling of the tropical region has gained importance, in particular for flight safety. Since ionosphere is dispersive in nature, dual frequency (L1 = 1575.42 MHz and L2 = 1227.60 MHz) GPS observations can be used to obtain Ionospheric Total Electron Content (TEC). Since TEC varies with local time and geomagnetic latitude, an Ionospheric Modeling Technique using spatial linear approximation of vertical TEC over

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Anand, Raj R. "Kalman Filter Estimation Of Ionospheric TEC And Differential Instrumental Biases Over Low Latitude Using Dual Frequency GPS Observations." Thesis, 2006. http://hdl.handle.net/2005/426.

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The low latitude tropical ionosphere has been investigated by various researchers using Global Positioning System (GPS). Presently for many civil aviation applications, the ionospheric modeling of the tropical region has gained importance, in particular for flight safety. Since ionosphere is dispersive in nature, dual frequency (L1 = 1575.42 MHz and L2 = 1227.60 MHz) GPS observations can be used to obtain Ionospheric Total Electron Content (TEC). Since TEC varies with local time and geomagnetic latitude, an Ionospheric Modeling Technique using spatial linear approximation of vertical TEC over

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Chung, Tzu-Ping, and 鍾志斌. "Investigation of storm-time low latitude ionosphere trough and the associated plasma wave phenomena using ROCSAT-1/IPEI data." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/91707166265742853535.

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碩士<br>國立中央大學<br>太空科學研究所<br>92<br>Abstract The ROCSAT-1 satellite was launched into a circular orbit at about 600 km altitude with an inclination of 35 degrees. The onboard ionosphereic plasma and electrodynamic instrument (IPEI) takes in-situ measurements of ionospheric parameters. The ROCSAT-1 orbits cover the geographic latitude range between 35°N and 35°S (maximum magnetic latitude, about ±50°). The data used here include ionospheric ion density, temperature, ion drift velocity and ions composition measured by IPEI during the great magnetic storm on March 31 and April 1, 2001. These data a

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Liu, Yen Hung, and 劉彥宏. "Using ROCSAT-1 In-situ Data to Study the Radiowave Scintillation Phenomenon in the Equatorial to Low-Latitude Ionosphere." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/30280497356505452744.

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博士<br>國立中央大學<br>電機工程學系<br>101<br>The global/seasonal/local-time distributions of scintillation occurrence rate have been obtained from the in-situ density measurement of ROCSAT-1 during moderate to high solar activity periods of 2000 to 2003. The scintillation was obtained with a modified procedure of the thin-phase screen model of Rino reported in Wernik et al. [2007]. The distribution of the S4 index for the weak scintillation (S4<0.3) is almost identical to that of the equatorial irregularity distribution reported in the literature. However, as the scintillation level increases (0.3< S4<

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Hsiao, Tung-yuan, and 蕭棟元. "Study of low-latitude ionospheric irregularity structure based on New LITN." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/bdk2y7.

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博士<br>國立中央大學<br>太空科學研究所<br>96<br>A radio signal traversing the ionosphere will be modified by irregularities. When received at an antenna, these signals present random temporal fluctuations in both amplitude and phase. Scintillations are particularly severe in the tropical regions around the equinoxes during the evenings. National Central University rebuilt the LITN (Low latitude Ionosphere Tomography Network) in 2006. The scintillation measurements and ionospheric tomography reconstruction of the beacon satellites in this study for three specific low-latitude locations were spaced approximat

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Chen, Her-Yuan, and 陳鶴元. "The simulation of low latitude ionospheric tomography by using ITS system." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/eqs26p.

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碩士<br>國立中央大學<br>太空科學研究所<br>94<br>The Low Latitude Ionospheric Tomographic Network (LITN) suitable for the study of lare scale ionosphere structure , especially in the Taiwan area , we can study the large scale electron density variation in the equatorial anomaly region . In the past, NCU had begun to set up LITN . It consisted of six ground-based receivers spanning 20∘along Taiwan meridian (121∘E) to receiver beacon signals from the US Naval Navigation Satellite System (NNSS) with receiver JMR-1 in order to carry out the large scale experiments on two-dimensional ionospheric imaging by compute

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"Effect of the ionosphere of low latitudes in gps - sbas (global system positioning space based augmentation system)." Tese, MAXWELL, 2004. http://www.maxwell.lambda.ele.puc-rio.br/cgi-bin/db2www/PRG_0991.D2W/SHOW?Cont=5863:pt&Mat=&Sys=&Nr=&Fun=&CdLinPrg=pt.

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Sun, Yang-Yi, and 孫楊軼. "Low latitude ionospheric irregularities observed by FORMOSAT-1 and GPS ground-based receivers during soloar maximum." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/31798834003405288676.

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碩士<br>國立中央大學<br>太空科學研究所<br>97<br>A ground-based receiver of the global positioning system (GPS) can easily probe the ionosphere, except desert and oceanic areas, with a high temporal resolution. By contrast, a satellite orbiting observes large area (for example, FORMOSAT-1 covers the ionosphere within +/- 35°) and, however its revisit time generally is rather long. In this study, seasonal and geographical variations as well as geomagnetic storm signatures in ionospheric irregularities within +/- 35° are examined by employing worldwide ground-based GPS receivers and FORMOSAT-1 during the solar

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Friedel, Reiner Hans-Walter. "A study of wave induced electron precipitation at low and middle latitudes." Thesis, 1991. http://hdl.handle.net/10413/5682.

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Wave induced electron precipitation (WIEP) can modify the ionosphere above a sub-ionospherically propagating VLF signal in such a way as to perturb the amplitude and phase of the signal: The "Trimpi Event". In this thesis trimpi events are used in a study of WIEP events and in the responsible mechanism: The gyroresonant interaction. Trimpi activity at middle latitudes (SANAE, Antarctica, L = 4.02) and low latitudes (Durban, RSA , L = 1.69) together with the corresponding theory for the gyroresonant interaction is examined and compared. A newly developed computerised system for the detection an

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Chu, Fang-Dar, and 褚芳達. "A long term observation of ionospheric irregularities at low latitudes by using GPS phase fluctuations." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/93823066607957404567.

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博士<br>國立中央大學<br>太空科學研究所<br>95<br>The electron density irregularities in the ionosphere would affect the propagation of electromagnetic wave. The spreading F layer phenomena which caused by electron density irregularities at low latitudes is an important research topic. It could have been deduced that the distribution of occurrence rates of equatorial spread F (ESF) shows obvious longitude effect by using many observation techniques (radar power map / scintillation, ionosonde spread-F, satellite measurement / scintillation, and optical imager) in the past. Nevertheless, those techniques are

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