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The Terrestrial Magnetospheric Response to the 28th October 2021 CME
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  • James Edwin Waters,
  • Caitriona M Jackman,
  • Daniel Whiter,
  • Alexandra R Fogg,
  • Laurent Lamy,
  • Jennifer Alyson Carter,
  • Laura Jane Fryer,
  • Corentin Louis,
  • Eion Carley,
  • Carine Briand,
  • Karine Issautier,
  • Larry J. Paxton,
  • Baptiste Cecconi,
  • Xavier Bonnin,
  • Peter Gallagher
James Edwin Waters
University of Southampton

Corresponding Author:[email protected]

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Caitriona M Jackman
Dublin Institute for Advanced Studies
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Daniel Whiter
University of Southampton
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Alexandra R Fogg
School of Cosmic Physics, DIAS Dunsink Observatory, Dublin Institute For Advanced Studies
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Laurent Lamy
LESIA, Observatoire de Paris, CNRS, PSL
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Jennifer Alyson Carter
University of Leicester
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Laura Jane Fryer
University of Southampton
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Corentin Louis
DIAS
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Eion Carley
Dublin Institute For Advanced Studies
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Carine Briand
LESIA/Observatoire de Paris-PSL, CNRS, Sorbonne Université, Université Paris
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Karine Issautier
LESIA
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Larry J. Paxton
Johns Hopkins University
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Baptiste Cecconi
Observatoire de Paris
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Xavier Bonnin
Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique
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Peter Gallagher
DIAS
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Abstract

On October 28th 2021 the Sun released a large Coronal Mass Ejection (CME) in Earth’s direction. An X1.0 class solar flare and a rare ground level enhancement (GLE) were observed, along with bright solar radio bursts. Here we examine data from the near-Earth environment to investigate the terrestrial response to this solar event, as a typical example of Sun-Earth interactions. The CME arrival is tracked at $\sim$1 AU from Wind radio observations and the interplanetary magnetic field (IMF) and solar wind dynamic pressure by \textit{in-situ} measurements of OMNI spacecraft. Geomagnetic activity is studied with indices including SYM-H while the auroral response is monitored by remote Wind radio measurements of Auroral Kilometric Radiation (AKR) and SSUSI UV observations. We quantify the timeline for solar wind-magnetosphere coupling via exploration of the dayside reconnection rate and polar cap voltages and address the visibility of AKR sources for a dayside radio observatory.