Singh, Arun Kumar and Saini, Shailendra and Das, Rupesh M (2019) Impact of geomagnetic variation over sub-auroral ionospheric region during high solar activity year 2014. Advances in Space Research, 63 (10). pp. 3189-3199. ISSN 0273-1177
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Abstract
The present work is an attempt to evaluate the impact of changing space weather condition over sub-auroral ionosphere during high solar activity year 2014. In view of this, the GPS based TEC along with Ionosonde data over Indian permanent scientific base "Maitri", Antarctica (70 degrees 46'00 '' S, 11 degrees 43'56 '' E) has been utilized. The results suggested that the nature of ionospheric responses to the geomagnetic disturbances not only depended upon the status of high latitudinal electro-dynamic processes but also influenced by the seasonal variations. The results revel both negative and positive type of ionospheric response in a single year but during different seasons. The study suggested that the combination of equator-ward plasma transportation along with ionospheric compositional changes causes a negative ionospheric impact especially during summer and equinox seasons. However, the combination of pole-ward contraction of the oval region along with particle precipitation may lead to exhibit positive ionospheric response during the winter season. The plasma transportation direction has been validated with the help of convection boundary (HM boundary) deduced with the help of SuperDARN observations. The ground based ionosonde observations clearly provided the evidence of deep penetration of high energetic particles up to the E-layer heights which results a sudden and strong appearance of E-layer. The strengthening of E-layer is responsible for modification of auroral electrojet and field-aligned current system. Also, the sudden appearance of E-layer along with a decrease in F-layer electron density suggested the dominance of NO+ over O+ in a considered region under geomagnetic disturbed condition. (C) 2019 COSPAR. Published by Elsevier Ltd. All rights reserved.
| Item Type: | Article |
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| Additional Information: | Copyright for this article belongs to M/s Elsevier |
| Subjects: | Engineering Meteorology & Atmospheric Sciences Astronomy & Astrophysics |
| Divisions: | UNSPECIFIED |
| Depositing User: | Mr. Yogesh Joshi |
| Date Deposited: | 19 Aug 2026 11:32 |
| Last Modified: | 19 Aug 2026 11:32 |
| URI: | https://npl.csircentral.net/id/eprint/4325 |
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