Highly localized unique electrodynamics and plasma irregularities linked with the 17 March 2015 severe magnetic storm observed using multitechnique common-volume observations fromGadanki, India

摘要

abstract_textpIn this paper we study equatorial electrodynamics and plasma irregularities linked with the 17 March 2015 severe magnetic storm in the Indian sector by using common volume observations made by the Gadanki Ionospheric Radar Interferometer, airglow imager, Digisonde, and GPS receiver established at Gadanki (13.5 degrees N, 79.2 degrees E). Observations show that with the initiation of the storm at similar to 06: 00 UT on 17 March, which happened to be midday in the Indian sector, the low-latitude ionosphere responded in tune with the storm-induced electric field and by the sunset time the base of the F layer ascended to an altitude of 470 km with a peak upward velocity of 50ms(-1) eventually manifesting equatorial plasma bubble and irregularities causing strong GPS scintillation. The most important finding found in this study is the confinement of plasma bubble and irregularities in a narrow longitude zone of 69 degrees E-98 degrees E. Results also show reversal of zonal drift of the irregularities from similar to 120 ms(-1) eastward drift to similar to 120ms(-1) westward drift in a time span of similar to 30 min. Both observations are shown to be linked with very special electrodynamical conditions induced by the magnetic storm-related electric field in the dusk sector. Intriguing details of the longitudinally localized electrodynamics and plasma irregularities are discussed in terms of prompt penetration and disturbed dynamo electric field effects./p/abstract_text