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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2024年5月10日地磁风暴期间强emf - by对赤道电离层电动力学的影响

了解行星际磁场（IMF-By）的东西分量对赤道电离层电动力学的影响是具有挑战性的，因为在扰动时期同时发生多种机制所引起的复杂响应。2024年5月10日，由多个icme相互作用引起的极端地磁风暴，伴随着前所未有的IMF-By震级及其极性，在IMF-Bz向北转向过程中由西向东转变了130 nT。来自近赤道地区的地面电离层探测器对h’f的观测，以及来自Swarm卫星的等离子体密度的纬向剖面，首次揭示了在黄昏结束点（17-19.5 LT）附近强emf - by的影响，在向北的emf - bz期间产生了强大的黎明至黄昏电离层电场。这个电场在赤道附近产生了巨大的电离层等离子体隆起，随后在黄昏附近产生了超级喷泉效应。增大的IMF-By振幅和粘性项的联合作用可能导致太阳风与磁层的耦合增强。

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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.