TitleIonospheric response to a geomagnetic storm during November 8–10, 2004
Publication TypeJournal Article
Year of Publication2013
AuthorsSimi, KG, Manju, G, Haridas, MKMadhav, Nayar, SRPrabhak, Pant, TKumar, Alex, S
JournalEarth, Planets and Space
Volume65
Issue4
Pagination343 - 350
Date Published05/2013
ISSN13438832
KeywordsEquatorial Electrojet; Equatorial ionization anomaly; geomagnetic storm; O/N2 ratio
Abstract

This paper investigates the response of the equatorial, and near equatorial, ionosphere to geomagnetic disturbances during the period November 8-10, 2004. Ionosonde data from Trivandrum (8.5°N 77°E and dip 0.5°N) and SHAR (13.5°N, 80.2°E, dip ∼5.5°N), magnetic field data from Tirunelveli (8.7°N, 76.9°E, dip latitude 0.5°S) and Alibag (18.64°N, 72.87°E), and GUVI O/N2 data in the Indian longitude sector, are used for the study. The behavior of interplanetary parameters is also examined in conjunction with the ionospheric data. On 8 November, the EIA around noontime is not fully inhibited even though the electrojet strength an indicates inhibition of EIA due to a disturbance dynamo electric field effect. It is the enhanced O/N2 over TRV and SHAR, with a larger increase over SHAR, which results in a larger (than expected) value of the EIA proxy parameter. On 9 November, the comparable values of foF2 at TRV and SHAR around noon time is due to the combined effect of a weakened anomaly in the presence disturbance dynamo electric field effects leading to the EIA crest being near SHAR, and increased O/N2 values at TRV and SHAR with a larger increase at TRV. On 10 November, the very strong values of the EIA proxy-SHAR parameter is attributed to the combined effects of prompt penetration electric field related modulations of EIA, and significant O/N2 changes at the equatorial, and near equatorial, latitude. Thus, the study reveals the important role of storm-induced O/N2 changes, along with prompt penetration electric fields and disturbance dynamo electric fields in modulating the ionization distribution in the equatorial ionization anomaly (EIA) region during this period.

URLhttp://www.terrapub.co.jp/journals/EPS/abstract/6504/65040343.html
DOI10.5047/eps.2012.09.005
Short TitleEarth Planets Space


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