Antarctica SED/TOI associated ionospheric scintillation during 27 February 2014 geomagnetic storm

Shishir Priyadarshi, Q. -H. Zhang, Y. -Z. Ma

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Abstract

A geomagnetic storm occurred on 27 February 2014 and the shock related to it arrived at Earth’s magnetosphere at ∼17:00 UT. Dayside cusp region scintillation over Antarctica have been studied along with the Global Positioning System (GPS) observed total electron content (TEC), and Defense Meteorological Satellite Program (DMSP) Precipitating Particles (SSJ), Bulk Plasma Parameters (SSIES) and Magnetic Fields (SSM) data. For the first time, similar variation trend in amplitude and phase scintillation has been found near the polar latitude. Amplitude scintillation index (S4) and phase scintillation index (σφ) show the similar enhancement trend at different numerical scale. During the southward interplanetary magnetic field (IMF) Bz condition there is a significant enhancement in the particle precipitation occurred through the dayside cusp region. During southward IMF Bz and dawnward By (By<0), high convection velocity guide solar wind plasma into the polar cap which enhances the phase scintillation, but, no amplitude scintillation enhancement at the similar numerical scale. The Halley and Dome C East radar data show that at the small to medium ionospheric irregularity speed, S4, and σφ variations are alike. If proper variation scale is chosen, S4 also appears an appropriate scintillation index for the polar ionosphere. The possible mechanism for S4 occurrence similar to the σφ at a dissimilar level has been discussed.
Original languageEnglish
Article number262
JournalAstrophysics and Space Science
Volume363
DOIs
Publication statusPublished - 4 Dec 2018

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