Ionospheric response to Strong Geomagnetic Storms during 2000-2005: An IMF clock angle perspective

Abstract

This paper presents the equatorial ionospheric response to eleven strong-to-severe geomagnetic storms that occurred during the period 2000-2005, the declining phase of the solar cycle 23. The analysis has been performed using the global ion density plots of Defense Meteorological Satellite Program (DMSP). Observations show that for about 91% of the cases, post-sunset equatorial irregularities occurred within 3h from the time of northward to southward transition of the Interplanetary Magnetic Field (IMF) clock angle, thus bringing out the importance of the role played by IMF By in the process of Prompt Penetration of Electric Field (PPEF) in addition to the IMF Bz. This is an improvement from the previously reported (Ray et al.,2015) 4h window of ESF generation from the southward IMF Bz crossing -10 nT.

15 pages, 6 figures, accepted for publication in Radio Science

References in corpus (1)

• Observations of an extreme storm in interplanetary space caused by successive coronal mass ejections

Cited by in corpus (5)

• Systematic study of ionospheric scintillation over the indian low-latitudes during low solar activity conditions
• Global asymmetry in $\Delta$X variations during the 06 April 2000 geomagnetic storm: Relative roles of IMF Bz and By
• On the Low-Latitude Ionospheric Irregularities under Geomagnetically Active and Quiet Conditions using NavIC observables: A Spectral Analysis Approach
• Study of Low-latitude Ionospheric Scintillation using NavIC
• Evidence of changes in the low-latitude plasma drift under IMF $B_z$ coupling: a TIEGCM simulation approach