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Spatial Variations in Disturbance Ionospheric Currents—Inference From 12 Geomagnetic Storms
Author(s) -
Bulusu Jayashree,
Archana R. K.,
Arora Kusumita
Publication year - 2020
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2019ja027718
Subject(s) - disturbance (geology) , geomagnetic storm , ionosphere , storm , earth's magnetic field , environmental science , geology , geophysics , meteorology , geography , physics , magnetic field , geomorphology , quantum mechanics
In this paper, we investigate the latitudinal and longitudinal variations of the disturbance ionospheric current during 12 geomagnetic storms with Dst ranging between −50 and −130 nT. For this purpose, data from 15 geomagnetic stations along three longitudinal sectors at 70°E, 77°E, and 93°E, ranging from middle to equatorial latitudes in both hemispheres are analyzed. Our study reveals the pattern of PP in the different phases of the storm and the competing effects of PP and Ddyn during the recovery phase of the storms. The PP signatures are mainly comparable across longitudes, irrespective of the strength and phase of the storm. The effect of Ddyn shows a seasonal pattern, which is influenced by the strength of the storm. The location of the antifoci during each storm shows latitudinal variability.