Gotowe bibliografie tematyczne / Equatorial Ionization anomaly

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  2. Rozprawy doktorskie
  3. Części książek
  4. Streszczenia konferencji

Gotowa bibliografia na temat „Equatorial Ionization anomaly”

Autor: Grafiati
Data publikacji: 6 września 2023
Data aktualizacji: 14 czerwca 2025

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Artykuły w czasopismach na temat "Equatorial Ionization anomaly"

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Bharti, Gaurav, T. Bag, and M. V. Sunil Krishna. "Effect of geomagnetic storm conditions on the equatorial ionization anomaly and equatorial temperature anomaly." Journal of Atmospheric and Solar-Terrestrial Physics 168 (March 2018): 8–20. http://dx.doi.org/10.1016/j.jastp.2017.12.014.

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Wang, Hai-Ning, Qing-Lin Zhu, Xiang Dong, et al. "A Novel Technique for High-Precision Ionospheric VTEC Estimation and Prediction at the Equatorial Ionization Anomaly Region: A Case Study over Haikou Station." Remote Sensing 15, no. 13 (2023): 3394. http://dx.doi.org/10.3390/rs15133394.

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This paper introduces a novel technique that uses observation data from GNSS to estimate the ionospheric vertical total electron content (VTEC) using the Kriging–Kalman method. The technique provides a method to validate the accuracy of the Ionospheric VTEC analysis within the Equatorial Ionization anomaly region. The technique developed uses GNSS VTEC alongside solar parameters, such as solar radio flux (F10.7 cm), Disturbance Storm Time (Dst) and other data, and Long Short Term Memory (LSTM) Networks to predict the occurrence time of the ionospheric equatorial anomaly and ionospheric VTEC changes. The LSTM method was applied to GNSS data from Haikou Station. A comparison of this technique with the neural network (NN) model and International Reference Ionosphere model shows that the LSTM outperforms all of them at VTEC estimation and prediction. The results, which are based on the root mean square error (RMSE) between GNSS VTEC and GIM VTEC outside the equatorial anomaly region, was 1.42 TECU, and the results of GNSS VTEC and VTEC from Beidou geostationary orbit satellite, which lies inside the equatorial ionization anomaly region, was 1.92 TECU. The method developed can be used in VTEC prediction and estimation in real time space operations.
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Lee, I. T., J. Y. Liu, C. H. Lin, K. I. Oyama, C. Y. Chen, and C. H. Chen. "Ionospheric plasma caves under the equatorial ionization anomaly." Journal of Geophysical Research: Space Physics 117, A11 (2012): n/a. http://dx.doi.org/10.1029/2012ja017868.

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Chen, Pei-Ren. "Two-day oscillation of the equatorial ionization anomaly." Journal of Geophysical Research 97, A5 (1992): 6343. http://dx.doi.org/10.1029/91ja02445.

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Eastes, R. W., S. C. Solomon, R. E. Daniell, et al. "Global‐Scale Observations of the Equatorial Ionization Anomaly." Geophysical Research Letters 46, no. 16 (2019): 9318–26. http://dx.doi.org/10.1029/2019gl084199.

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Raghavarao, R., M. Nageswararao, J. Hanumath Sastri, G. D. Vyas, and M. Sriramarao. "Role of equatorial ionization anomaly in the initiation of equatorial spread F." Journal of Geophysical Research 93, A6 (1988): 5959. http://dx.doi.org/10.1029/ja093ia06p05959.

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Sharma, P., and R. Raghavarao. "Simultaneous occurrence of ionization ledge and counterelectrojet in the equatorial ionosphere: observational evidence and its implications." Canadian Journal of Physics 67, no. 2-3 (1989): 166–72. http://dx.doi.org/10.1139/p89-028.

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In this paper we present observational evidence for the simultaneous occurrence of an ionization ledge in the topside and a counterelectrojet in the E-region altitudes of the equatorial ionosphere. The following morphological features of the ionization ledge are found to be the same as those of the counterelectrojet phenomenon: namely, occurrence on a sequence of days in succession, preferential occurrence during a solar minimum period as compared with a solar maximum period, occurrence in a limited longitudinal belt, and lunar control of the occurrence as revealed by our data.There is also a high degree of correlation on both magnetically quiet and magnetically disturbed days between the ionization ledge and the counterelectrojet. Our study brings out a close coupling in the occurrence and morphological features of the two low-latitude phenomena, even though they are widely separated in altitude. The implications of such a correlation, with special reference to the understanding of the dynamical coupling of the E and F regions in the equatorial ionosphere, are briefly discussed.We also report a hitherto unreported feature of the ionization anomaly, viz., its occurrence on certain days in a narrow (~30°) longitude belt. The observational evidence presented in this paper may lead to new insights into the understanding of the interrelationships between the three phenomena, the ionization ledge, the ionization anomaly, and the counterelectrojet, in the equatorial ionosphere.
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Ray, S., A. Paul, and A. DasGupta. "Equatorial scintillations in relation to the development of ionization anomaly." Annales Geophysicae 24, no. 5 (2006): 1429–42. http://dx.doi.org/10.5194/angeo-24-1429-2006.

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Abstract. The irregularities in the electron density distribution of the ionosphere over the equatorial region frequently disrupt space-based communication and navigation links by causing severe amplitude and phase scintillations of signals. Development of a specification and forecast system for scintillations is needed in view of the increased reliance on space-based communication and navigation systems, which are vulnerable to ionospheric scintillations. It has been suggested in recent years that a developed equatorial anomaly in the afternoon hours, with a steep gradient of the F-region ionization or Total Electron Content (TEC) in the region between the crest and the trough, may be taken as a precursor to scintillations on transionospheric links. Latitudinal gradient of TEC measured using Faraday Rotation technique from LEO NOAA 12/14 transmissions during the afternoon hours at Calcutta shows a highly significant association with L-band scintillations recorded on the INMARSAT link, also from Calcutta, during the equinoxes, August through October 2000, and February through April 2001. The daytime equatorial electrojet is believed to control the development of the equatorial anomaly and plays a crucial role in the subsequent development of F-region irregularities in the post-sunset hours. The diurnal maximum and integrated value (integrated from the time of onset of plasma influx to off-equatorial latitudes till local sunset) of the strength of the electrojet in the Indian longitude sector shows a significant association with post-sunset L-band scintillations recorded at Calcutta during the two equinoxes mentioned earlier. Generation of equatorial irregularities over the magnetic equator in the post-sunset hours is intimately related to the variation of the height of the F-layer around sunset. Ionosonde data from Kodaikanal, a station situated close to the magnetic equator, has been utilized to calculate the vertical drift of the F-layer over the magnetic equator for the period August through October 2000. The post-sunset F-region height rise over the magnetic equator shows a remarkable correspondence with the occurrence of scintillations at Calcutta located near the northern crest of the equatorial anomaly. Existence of a flat-topped ionization distribution over the magnetic equator around sunset has been suggested as a possible indication of occurrence of post-sunset scintillations. Width of the latitudinal distribution of ionization obtained from DMSP satellite shows some correspondence with post-sunset L-band scintillations. During the period of observation of the present study (August through October 2000, and February through April 2001), it has been observed that although the probability of occurrence of scintillations is high on days with flat-topped ion density variation over the equator, there are cases when no scintillations were observed even when a pronounced flat top variation was recorded.
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Goncharenko, L. P., A. J. Coster, J. L. Chau, and C. E. Valladares. "Impact of sudden stratospheric warmings on equatorial ionization anomaly." Journal of Geophysical Research: Space Physics 115, A10 (2010): n/a. http://dx.doi.org/10.1029/2010ja015400.

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Rama Rao, P. V. S., P. T. Jayachandran, and P. Sri Ram. "Ionospheric irregularities: The role of the equatorial ionization anomaly." Radio Science 32, no. 4 (1997): 1551–57. http://dx.doi.org/10.1029/97rs00665.

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Rozprawy doktorskie na temat "Equatorial Ionization anomaly"

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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 experiments and applications. The daytime equatorial electrojet (EEJ), equatorial ionization anomaly (EIA), as well as nighttime equatorial plasma bubble (EPB) and plasma blobs are the most prominent low-latitude ionospheric phenomena. This dissertation focuses on the multi-diagnostic study of the mechanism, properties, abnormalities, and interrelationships of these phenomena to provide significant contributions to space weather communities from the ground- and space-based measurements. A strong longitudinal, seasonal, day-to-day variability and dependency between EEJ, ExB vertical plasma drift, and total electron content (TEC) in the EIA distribution are seen in the equatorial and low-latitude region. In general, the EEJ strength is stronger in the west coast of South America than in its east coast. The variability of the EEJ in the dayside ionosphere significantly affects the ionospheric electron density variation, dynamics of the peak height of F2-layer, and TEC distributions as the EEJ influences the vertical transport mechanism of the ionospheric plasma. The eastward electric field (EEF) and the neutral wind play a decisive role in controlling the actual configuration of the EIA. The trans-equatorial neutral wind profile calculated using data from the Second-generation, Optimized, Fabry-Perot Doppler Imager (SOFDI) located near the geomagnetic equator and a physics-based numerical model, LLIONS (Low-Latitude IONospheric Sector) give new perspectives on the effects of daytime meridional neutral winds on the consequent evolution of the asymmetry of the equatorial TEC anomalies during the afternoon onwards. The spatial configurations including the strength, shape, amplitude and latitudinal extension of the EIA crests are affected by the EEF associated with the EEJ under undisturbed conditions, whereas the meridional neutral winds play a significant role in the development of their asymmetric structure in the low-latitude ionosphere. Additionally, the SWARM satellite constellation and the ground-based LISN (Low-Latitude Ionospheric Sensor Network) data allow us to resolve the space-time ambiguity of past single-satellite studies and detect the drastic changes that EPBs and plasma blobs undergo on a short time scale. The coordinated quantitative analysis of a plasma density observation shows evidence of the association of plasma blobs with EPBs via an appropriate geomagnetic flux tube. Plasma blobs were initially associated with the EPBs and remained at the equatorial latitude right above the EPBs height, but later were pushed away from geomagnetic equator towards EIA latitudes by the EPB/ depleted flux tubes that grew in volume. Further, there exists a strong correlation between the noontime equatorial electrojet and the GPS-derived TEC distributions during the afternoon time period, caused by vertical E × B drift via the fountain effect. Nevertheless, only a minor correlation likely exists between the peak EEJ and the net postsunset ionospheric scintillation index (S4) greater than 0.2. This study not only searches for a mutual relationship between the midday, afternoon and nighttime ionospheric phenomena but also aims at providing a possible route to improve our space weather forecasting capability by predicting nighttime ionospheric irregularities based on midday measurements at the equatorial and low latitudes<br>Thesis (PhD) — Boston College, 2018<br>Submitted to: Boston College. Graduate School of Arts and Sciences<br>Discipline: Physics
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Chen, Chia-Hung, and 陳佳宏. "Ionospheric Equatorial Ionization Anomaly and Equatorial Electrojet." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/56cpwm.

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碩士<br>國立中央大學<br>太空科學研究所<br>94<br>Many studies show seasonal variations of equatorial ionization anomaly (EIA). In this thesis, the ionospheric total electron content (TEC) in the Asian sector derived from measurements of ground-based receivers of the global positioning system (GPS) is employed to investigate the EIA variations during 1997-2005. In addition, magnetometer data from the Circum-pan Pacific Magnetometer Network (CPMN) are used to study the EIA variations associated with the equatorial electrojet (EEJ). It is found in both the northern and southern hemispheres that the EIA crests manifest remarkable seasonal variations. The EIA maxima lag those of the EEJ by about 1.5-3 hours. The results reveal the time delay of both hemispheres to be asymmetry and vary with seasons. There are obvious relations between the intensity of EEJ and EIA as well as distance between the two crests. The associated correlation coefficients are about 0.52. However, no obvious seasonal and solar activity effects are found between the two observations.
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Yu-TsungChen and 陳昱璁. "Numerical simulation on structures and electrodynamics ofionospheric plasma cave and equatorial ionization anomaly." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/17267998340691093084.

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碩士<br>國立成功大學<br>地球科學系<br>102<br>This thesis studies the ionospheric plasma structure and electrodynamic using theoretical simulations. This study focus on the mechanism for the formation of ionospheric plasma caves and nonlinear coupling between atmosphere tides and ionospheric total electron content. Variations of the ionospheric electron density structures related to forcing from tides propagating upward from the lower atmosphere have been studied intensively recently. Some observational studies have shown the plasma cave structure exists under the equatorial ionization anomaly. In this study, the electron density structures of plasma caves are reproduced by means of the NRL SAMI3 model, which incorporates neutral winds from the empirical Horizontal Wind Model 2007 (HWM07) and the NCAR Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model (TIME-GCM). We discuss the relation between different electric/wind fields and ionospheric plasma structure. The simulation results show that the equatorial plasma cave structures are mainly developed by latitudinally convergent neutral winds. The tidal-decomposition analysis further suggests that the convergent neutral wind field and the intensity of the plasma cave are highly associated with the migrating terdiurnal tidal (TW3) component of the meridional neutral wind. In the simulations of the coupling between the atmospheric thermal tides and ionospheric TECs, the influence from neutral wind effects are more significant than from the electric field in ionosphere. We also find nonlinear interaction between atmosphere tides and ionospheric parameters. The level of solar activity also leads different coupling process by the enhanced F region dynamo and photoionization.
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Chien, Shih-han, and 簡士涵. "Variability of the Equatorial Ionization Anomaly on seasonal and day-to-day time scales." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/11744104703305279794.

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碩士<br>國立中央大學<br>太空科學研究所<br>103<br>The Equatorial Ionization Anomaly (EIA) is a persistent feature of the ionospheric F layer, located around 300 km altitude, generated by the E-region wind dynamo driven equatorial fountain. We report our analysis of short term EIA variability due to atmospheric, solar, and geophysical sources. Short-term anomalies in EIA region total electron content (TEC) from GPS-derived global ionosphere maps (GIM) at 105° W, 15°E and 120°E longitude are compared to anomalies in three different geophysical sources: solar flux (F10.7 solar flux proxy), geomagnetic storms (Kp index), and atmospheric mesosphere and lower thermosphere (MLT) zonal winds near the semidiurnal tidal peak at northern mid-latitudes and at the equator (GAIA assimilative general circulation model). We present spectral and coherence analysis of EIA TECs and the aforementioned geophysical indices in 2008 and 2012, to illustrate their variability on seasonal and day to day time scales. Our results demonstrate that the variability of the F10.7 solar flux proxy is dominated by the 27 day solar rotation periodicity at all longitude zones. The Kp index shows significant 9 day periodicities in 2008 for entire year, though 2012 is dominated by significant variations with 13 day periods and 5-7 day periods during specific seasons due to differences in the distribution of solar wind corotating interaction regions (CIRs). The EIA TECs show good coherence with the Kp and F10.7 indicies in all three longitude zones during specific seasons. With regard to the neutral zonal winds, EIA TECs show good coherence with 100 km equatorial zonal winds in the same longitude region at specific known planetary wave periods during the solar maxima, but during solar minimum, 100 km mid-latitude zonal winds exhibit more impact on TECs, suggesting that the MLT latitude region responsible for modulation of the E-region dynamo winds differs between the two years examined.
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Liao, Ren-De, and 廖任德. "A Statistical Study of Equatorial Ionization Anomaly by Use of the IPEI Payload Onboard ROCSAT-1." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/90385576663781293415.

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碩士<br>國立中央大學<br>太空科學研究所<br>91<br>Abstract Due to the unique 35-degree orbital inclination of ROCSAT-1 and 100% duty-cycle operation of the Ionospheric Plasma and Electrodynamics Instrument (IPEI) , the ROCSAT-IPEI has collected a large set of ion density and velocity data over the equatorial ionization anomaly (EIA) region. In this thesis, we utilize the data acquired from IPEI in the year of 2000, which is during the solar maximum, to study the EIA phenomenon in the topside (600km altitude) ionosphere. For the convenience of statistical analysis, we define an EIA event as that the ion density maximum (crest) can be identified in both magnetic hemispheres along a satellite orbit (i.e., Double- Crest EIA). We investigate how the distribution of the EIA events varies with season, local time, latitude, longitude as well as geomagnetic configuration. We emphasize the longitudinal dependency of the EIA structures since such dependency of the EIA phenomenon has not been well explored. From the statistical analysis, we found that the EIA events most often occurred during equinoxes, and less often during solstices. Most of the EIA events were found in the local time sector between 13:00 and 15:00. The latitudinal distribution of the EIA crests varies with geographic longitudes. The hemispheric asymmetry was found in the latitude locations of the EIA crests. These statistical results can be explained in terms of Fountain effect that was triggered by the upward ion drift and modulated by the horizontal neutral wind along the geomagnetic field lines. In addition we find that the EIA crests are located at the highest latitude around the 14:00 hour local time in the longitude sector between 900E and 1200E. The observation is consistent with that observed by the Low-latitude Ionospheric Tomography Network (LITN).
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Części książek na temat "Equatorial Ionization anomaly"

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Batista, Inez S., Erica M. Diogo, Jonas R. Souza, Mangalathayil Ali Abdu, and Graham J. Bailey. "Equatorial Ionization Anomaly: The Role of Thermospheric Winds and the Effects of the Geomagnetic Field Secular Variation." In Aeronomy of the Earth's Atmosphere and Ionosphere. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0326-1_23.

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Streszczenia konferencji na temat "Equatorial Ionization anomaly"

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Paes, Ricardo da Rosa, Inez Staciarini Batista, Miguel Angelo Amaral Junior, Paulo Alexandre Bronzato Nogueira, and Paulo César Pernomian dos Santos. "Sudden Stratospheric Warming Event Influence on the Equatorial Ionization Anomaly." In 12th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 15-18 August 2011. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2011. http://dx.doi.org/10.1190/sbgf2011-444.

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Long, Fengyang, Chengfa Gao, and Yanfeng Dong. "Analysis of TEC Variations in Equatorial Ionization Anomaly Crest Region Over Western China." In 2021 7th International Conference on Space Science and Communication (IconSpace). IEEE, 2021. http://dx.doi.org/10.1109/iconspace53224.2021.9768310.

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Aswathy, R. P., G. Manju, and Surendra Sunda. "The Response Time Of Equatorial Ionization Anomaly Crest: A Unique Precursor To The Time Of Equatorial Spread F Initiation." In 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC). IEEE, 2019. http://dx.doi.org/10.23919/ursiap-rasc.2019.8738191.

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Chatterjee, Kalyan, Arundhati Sen, and Abhranila Das. "Multi-constellation satellite signal characterization near the northern crest of Equatorial Ionization Anomaly (EIA)." In 2015 International Conference and Workshop on Computing and Communication (IEMCON). IEEE, 2015. http://dx.doi.org/10.1109/iemcon.2015.7344465.

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Bakare, N. O., and B. O. Adebesin. "Observations of Ionospheric Propagation Factor at Two African Equatorial Ionization Anomaly Stations Using Ionosonde Measurements." In 2023 International Conference on Science, Engineering and Business for Sustainable Development Goals (SEB-SDG). IEEE, 2023. http://dx.doi.org/10.1109/seb-sdg57117.2023.10124537.

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Sur, Dibyendu, Aditi Das, and Ashik Paul. "Neural network based TEC model using multistation GPS-TEC around the northern crest of equatorial ionization anomaly." In 2012 International Conference on Computers and Devices for Communication (CODEC). IEEE, 2012. http://dx.doi.org/10.1109/codec.2012.6509336.

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Yadav, Sneha, R. S. Dabas, Rupesh M. Das, A. K. Upadhayaya, and A. K. Gwal. "Adaptive modeling of equatorial ionization anomaly crest parameters by using multistation ionosonde data over the Indian region." In 2011 XXXth URSI General Assembly and Scientific Symposium. IEEE, 2011. http://dx.doi.org/10.1109/ursigass.2011.6050975.

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Olwendo O. J, P. Baki, and P. J. Cilliers. "On the variability on the formation of Equatorial Ionization Anomaly crest over the East African low latitude region." In 2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC). IEEE, 2015. http://dx.doi.org/10.1109/ursi-at-rasc.2015.7303097.

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Yadav, Sneha, Rupesh M. Das, R. S. Dabas, T. K. Pant, and A. K. Gwal. "Development of computerized ionospheric tomography technique and its application to study the Equatorial Ionization Anomaly over the Indian region." In 2011 XXXth URSI General Assembly and Scientific Symposium. IEEE, 2011. http://dx.doi.org/10.1109/ursigass.2011.6050985.

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