Explicit IMF B y -Dependence of Energetic Protons and the Ring Current
© 2022 The Authors.
| Publié dans: | Geophysical research letters. - 1984. - 49(2022), 8 vom: 28. Apr., Seite e2022GL098031 |
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| Auteur principal: | |
| Autres auteurs: | |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2022
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| Accès à la collection: | Geophysical research letters |
| Sujets: | Journal Article IMF By energetic proton ring current solar wind‐magnetosphere interaction |
| Résumé: | © 2022 The Authors. The most important parameter driving the solar wind-magnetosphere interaction is the southward (B z ) component of the interplanetary magnetic field (IMF). While the dawn-dusk (B y ) component of the IMF is also known to play an important role, its effects are usually assumed to be independent of its sign. Here we demonstrate for the first time a seasonally varying, explicit IMF B y -dependence of the ring current and Dst index. Using satellite observations and a global magnetohydrodynamic model coupled with a ring current model, we show that for a fixed level of solar wind driving the flux of energetic magnetospheric protons and the growth-rate of the ring current are greater for B y < 0 (B y > 0) than for B y > 0 (B y < 0) in Northern Hemisphere summer (winter). While the physical mechanism of this explicit B y -effect is not yet fully understood, our results suggest that IMF B y modulates magnetospheric convection and plasma transport in the inner magnetosphere |
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| Description: | Date Revised 31.08.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 0094-8276 |
| DOI: | 10.1029/2022GL098031 |