An Updated Geomagnetic Index-Based Model for Determining the Latitudinal Extent of Energetic Electron Precipitation

E. M. Babu*, H. Nesse, S. M. Hatch, N. Olsen, J. A. Salice, I. G. Richardson

*Corresponding author for this work

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Abstract

Energetic Electron Precipitation (EEP) from the Earth's plasma sheet and the radiation belts is an important feature of atmospheric dynamics through their destruction of ozone in the lower thermosphere and mesosphere. Therefore, understanding the magnitude of the atmospheric impact of the Sun-Earth interaction requires a comprehensive understanding of the intensity and location of EEP. This study improves the accuracy of a previous pressure-corrected Dst model that predicts the equatorward extent of >43, >114, and >292 keV EEP using the measurements from the Medium Energy Proton Electron Detector detector of six National Oceanic and Atmospheric Administration/Polar Orbiting Environmental Satellites and EUMETSAT/METOP satellites. The improvement is achieved through multiple linear regression of pressure-corrected Dst and pressure-corrected Ring Current (RC) indices. The RC index mitigates the baseline variation of the Dst index that created an inherent solar cycle bias in the previous model. The new model is then extended to the Southern Hemisphere (SH) after removing the South Atlantic Anomaly longitudes from the data. More than 80% of the residuals lie within ±1.8° Corrected Geomagnetic Latitude (CGMLat) in the Northern Hemisphere and within ±1.98° CGMLat in the SH.

Original languageEnglish
Article numbere2023JA031371
JournalJournal of Geophysical Research: Space Physics
Volume128
Issue number10
Number of pages13
ISSN2169-9380
DOIs
Publication statusPublished - 2023

Keywords

  • Geomagnetic indices
  • Magnetospheric dynamics
  • Medium energy electrons
  • Particle precipitation model
  • Solar wind structures

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