Acceleration of ions by electric field pulses in the inner magnetosphere

TitleAcceleration of ions by electric field pulses in the inner magnetosphere
Publication TypeJournal Article
Year of Publication2015
AuthorsArtemyev, AV, Liu, J, Angelopoulos, V, Runov, A
JournalJournal of Geophysical Research: Space Physics
Date Published05/2015
Keywordsinjections; inner magnetosphere; ion acceleration
AbstractIntense (~5-15 mV/m), short-lived (≤1 min) electric field pulses have been observed to accompany earthward-propagating, dipolarizing flux bundles (DFB; flux tubes with a strong magnetic field) before they are stopped by the strong dipole field. Using Time History of Events and Macroscale Interactions During Substorms (THEMIS) observations and test particle modeling, we investigate particle acceleration around L-shell ~7-9 in the nightside magnetosphere and demonstrate that such pulses can effectively accelerate ions with tens of keV initial energy to hundreds of keV. This acceleration occurs because the ion gyroradius is comparable to the spatial scale of the localized electric field pulse at the leading edge of the flux bundle before it stops. The proposed acceleration mechanism can reproduce observed spectra of high-energy ions. We conclude thatthe electric field associated with dipolarizing flux bundles prior to their stoppage in the inner magnetosphere provides a natural site for intense local ion acceleration.
Short TitleJ. Geophys. Res. Space Physics

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