Explicit IMF B y -Dependence of Energetic Protons and the Ring Current.
Ontology highlight
ABSTRACT: 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.
SUBMITTER: Holappa L
PROVIDER: S-EPMC9286478 | biostudies-literature |
REPOSITORIES: biostudies-literature
ACCESS DATA