Ionospheric response to a geomagnetic storm during November 8–10, 2004
Earth, Planets and Space
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/N 2 data in the Indian longitude sector, are used for the study. The behavior of interplanetary parameters is
... tary 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/N 2 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 f o F 2 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/N 2 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/N 2 changes at the equatorial, and near equatorial, latitude. Thus, the study reveals the important role of storm-induced O/N 2 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.