Academic literature on the topic 'Equatorial Ionization anomaly'
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Journal articles on the topic "Equatorial Ionization anomaly"
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.
Full textWang, Hai-Ning, Qing-Lin Zhu, Xiang Dong, Dong-Sheng Sheng, Yong-Feng Zhi, Chen Zhou, and Bin Xu. "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 (July 4, 2023): 3394. http://dx.doi.org/10.3390/rs15133394.
Full textLee, 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 (November 2012): n/a. http://dx.doi.org/10.1029/2012ja017868.
Full textChen, 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.
Full textEastes, R. W., S. C. Solomon, R. E. Daniell, D. N. Anderson, A. G. Burns, S. L. England, C. R. Martinis, and W. E. McClintock. "Global‐Scale Observations of the Equatorial Ionization Anomaly." Geophysical Research Letters 46, no. 16 (August 19, 2019): 9318–26. http://dx.doi.org/10.1029/2019gl084199.
Full textRaghavarao, 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.
Full textSharma, 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 (February 1, 1989): 166–72. http://dx.doi.org/10.1139/p89-028.
Full textRay, S., A. Paul, and A. DasGupta. "Equatorial scintillations in relation to the development of ionization anomaly." Annales Geophysicae 24, no. 5 (July 3, 2006): 1429–42. http://dx.doi.org/10.5194/angeo-24-1429-2006.
Full textGoncharenko, 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 (October 2010): n/a. http://dx.doi.org/10.1029/2010ja015400.
Full textRama 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 (July 1997): 1551–57. http://dx.doi.org/10.1029/97rs00665.
Full textDissertations / Theses on the topic "Equatorial Ionization anomaly"
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.
Full textThesis advisor: Dr. Cesar E. Valladares
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
Thesis (PhD) — Boston College, 2018
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Physics
Chen, Chia-Hung, and 陳佳宏. "Ionospheric Equatorial Ionization Anomaly and Equatorial Electrojet." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/56cpwm.
Full text國立中央大學
太空科學研究所
94
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.
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.
Full text國立成功大學
地球科學系
102
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.
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.
Full text國立中央大學
太空科學研究所
103
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.
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.
Full text國立中央大學
太空科學研究所
91
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).
Book chapters on the topic "Equatorial Ionization anomaly"
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, 317–28. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0326-1_23.
Full textConference papers on the topic "Equatorial Ionization anomaly"
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.
Full textLong, 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.
Full textAswathy, 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.
Full textChatterjee, 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.
Full textBakare, 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.
Full textSur, 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.
Full textYadav, 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.
Full textOlwendo 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.
Full textYadav, 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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