Storm-induced energization of radiation belt electrons: Effect of wave obliquity

TitleStorm-induced energization of radiation belt electrons: Effect of wave obliquity
Publication TypeJournal Article
Year of Publication2013
AuthorsArtemyev, AV, Agapitov, OV, Mourenas, D, Krasnoselskikh, V, Zelenyi, LM
JournalGeophysical Research Letters
Volume40
Issue16
Pagination4138 - 4143
Date Published08/2013
Keywordsmagnetic storm; Radiation belts; wave-particle interactions
AbstractNew Cluster statistics allow us to determine for the first time the variations of both the obliquity and intensity of lower-band chorus waves as functions of latitude and geomagnetic activity near L∼5. The portion of wave power in very oblique waves decreases during highly disturbed periods, consistent with increased Landau damping by inward-penetrating suprathermal electrons. Simple analytical considerations as well as full numerical calculations of quasi-linear diffusion rates demonstrate that early-time electron acceleration occurs in a regime of loss-limited energization. In this regime, the average wave obliquity plays a critical role in mitigating lifetime reduction as wave intensity increases with geomagnetic activity, suggesting that much larger energization levels should be reached during the early recovery phase of storms than during quiet time or moderate disturbances, the latter corresponding to stronger losses. These new effects should be included in realistic radiation belt simulations.
URLhttp://doi.wiley.com/10.1002/grl.50837
DOI10.1002/grl.50837
Short TitleGeophys. Res. Lett.


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