Manifestations of Strong IMF-By on the Equatorial Ionospheric Electrodynamics During 10 May 2024 Geomagnetic Storm

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2024-12-01 DOI:10.1029/2024gl112569

Geeta Vichare, Mala S. Bagiya

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Abstract

Understanding the effects of east-west component of interplanetary magnetic field (IMF-By) on the equatorial ionospheric electrodynamics is challenging due to the complex response caused by the simultaneous occurrence of multiple mechanisms during disturbed times. The extreme geomagnetic storm on 10 May 2024 caused by multiple-ICME interactions accompanied with unprecedented IMF-By magnitudes and its polarity, changed from west to east by 130 nT during northward IMF-Bz turning. The ground ionosonde observations of h’F from near-equatorial locations, along with the latitudinal profiles of plasma densities from Swarm satellites reveal the first observational evidence of the impact of strong IMF-By near the dusk-terminator (17–19.5 LT), causing strong dawn-to-dusk ionospheric electric fields during northward IMF-Bz. This electric field produces large uplift of the ionospheric plasma near equator and subsequent super-fountain effect near the dusk. The combined effect of increased IMF-By amplitudes and viscous terms might have resulted into the enhanced coupling of solar wind with the magnetosphere.

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.