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Title: | Ionospheric response to a geomagnetic storm during November 8–10, 2004 |
Authors: | Simi, K.G. Manju, G. Haridas, M. K. Madhav Nayar, S. R. Prabhakaran Pant, Tarun Kumar Alex, S. |
Keywords: | Geomagnetic storm Equatorial Ionization Anomaly (EIA) O/N2 ratio Equatorial Electrojet (EEJ) EEJ |
Issue Date: | 2013 |
Citation: | Earth Planets Space, v.65, p.343-350, 2013, doi: 10.5047/eps.2012.09.005 |
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. |
URI: | http://localhost:8080/xmlui/handle/123456789/688 |
Appears in Collections: | ODA_Reprints |
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AlexS_EarthPlanetsSpace_2013.pdf | Reprint | 651.07 kB | Adobe PDF | View/Open |
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