Evidence for the significant differences in response times of equatorial ionization anomaly crest corresponding to plasma fountains during daytime and post'sunset hours

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dc.contributor.author Kumar, Ankit
dc.contributor.author Chakrabarty, D.
dc.contributor.author Pandey, K.
dc.contributor.author Fejer, B. G.
dc.contributor.author Sunda, S.
dc.contributor.author Seemala, G. K.
dc.contributor.author Sripathi, S.
dc.contributor.author Yadav, A. K
dc.coverage.spatial United States of America
dc.date.accessioned 2021-02-23T15:40:09Z
dc.date.available 2021-02-23T15:40:09Z
dc.date.issued 2021-04
dc.identifier.citation Kumar, Ankit; Chakrabarty, D.; Pandey, K.; Fejer, B. G.; Sunda, S.; Seemala, G. K.; Sripathi, S. and Yadav, A. K., “Evidence for the significant differences in response times of equatorial ionization anomaly crest corresponding to plasma fountains during daytime and post‐sunset hours”, Journal of Geophysical Research: Space Physics, DOI: 10.1029/2020JA028628, vol. 126, no. 3, Feb. 2021. en_US
dc.identifier.issn 2169-9402
dc.identifier.uri https://doi.org/10.1029/2020JA028628
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/6318
dc.description.abstract Based on 10 years (2010?2019) of vertical total electron content (VTEC) data from Ahmedabad (23.0-N, 72.6-E, dip angle 35.2) and campaign based OI 630.0 nm airglow intensity measurements from Mt. Abu (24.6-N, 72.7-E, dip angle 38.0), it is shown that plasma density over the equatorial ionization anomaly (EIA) crest region increases in varying degrees during post?sunset hours (2000?2100 LT) in magnetically quiet periods. The post?sunset peak in VTEC precedes the corresponding peak in airglow intensity. By comparing post?sunset VTEC enhancements with ionosonde observations from Tirunelveli (8.7-N, 77.7-E, dip angle 1.7), it is shown that pre?reversal enhancement (PRE) of the zonal electric field causes these enhancements over the EIA crest region. These observations are supported by TEC measurements by GAGAN (GPS Aided Geo Augmented navigation), the Indian Satellite based Augmentation System (SBAS). Comparison of average VTEC variations with global empirical model drifts reveals that the post?sunset enhancements in VTEC occurs ?1.7 hrs after the PRE and are significant only during December solstice and equinoctial months in high solar activity years similar to seasonal variations in PRE amplitudes. This time delay (response time of EIA crest) is almost half compared to the average response time (3?4 hrs) associated with the daytime fountain. Based on the latitudinal gradient in SBAS?TEC, it is proposed that the PRE drives plasma from 5-?10-N magnetic latitudes to the EIA crest region leading to shorter response time. These results show the important role of the PRE in conditioning the EIA crest region.
dc.description.statementofresponsibility by Ankit Kumar, D. Chakrabarty, K. Pandey, B. G. Fejer, S. Sunda, G. K. Seemala, S. Sripathi and A. K. Yadav
dc.language.iso en_Us en_US
dc.publisher American Geophysical Union en_US
dc.subject Pre?reversal Enhancement en_US
dc.subject Equatorial Plasma Fountain en_US
dc.subject Equatorial Ioniozation Anomaly en_US
dc.subject Low Latitude Ionosphere en_US
dc.subject Total Elctron Content en_US
dc.subject OI nm Airglow en_US
dc.title Evidence for the significant differences in response times of equatorial ionization anomaly crest corresponding to plasma fountains during daytime and post'sunset hours en_US
dc.type Article en_US
dc.relation.journal Journal of Geophysical Research: Space Physics


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