Explicit IMF B y -Dependence of Energetic Protons and the Ring Current

© 2022 The Authors.

Bibliographische Detailangaben
Veröffentlicht in:Geophysical research letters. - 1984. - 49(2022), 8 vom: 28. Apr., Seite e2022GL098031
1. Verfasser: Holappa, L (VerfasserIn)
Weitere Verfasser: Buzulukova, N Y
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:Geophysical research letters
Schlagworte:Journal Article IMF By energetic proton ring current solar wind‐magnetosphere interaction
Beschreibung
Zusammenfassung:© 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
Beschreibung:Date Revised 31.08.2024
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:0094-8276
DOI:10.1029/2022GL098031