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Event-specific chorus wave and electron seed population models in DREAM3D using the Van Allen Probes


AuthorTu, Weichao; Cunningham, G.; Chen, Y.; Morley, S.; Reeves, G.; Blake, J.; Baker, D.; Spence, H.;
KeywordsVan Allen Probes
AbstractThe DREAM3D diffusion model is applied to Van Allen Probes observations of the fast dropout and strong enhancement of MeV electrons during the October 2012 \textquotedblleftdouble-dip\textquotedblright storm. We show that in order to explain the very different behavior in the two \textquotedblleftdips,\textquotedblright diffusion in all three dimensions (energy, pitch angle, and L*) coupled with data-driven, event-specific inputs, and boundary conditions is required. Specifically, we find that outward radial diffusion to the solar wind-driven magnetopause, an event-specific chorus wave model, and a dynamic lower-energy seed population are critical for modeling the dynamics. In contrast, models that include only a subset of processes, use statistical wave amplitudes, or rely on inward radial diffusion of a seed population, perform poorly. The results illustrate the utility of the high resolution, comprehensive set of Van Allen Probes\textquoteright measurements in studying the balance between source and loss in the radiation belt, a principal goal of the mission.
Year of Publication2014
JournalGeophysical Research Letters
Volume41
Number of Pages1359-1366
Section
Date Published03/2014
ISBN
URLhttp://doi.wiley.com/10.1002/2013GL058819
DOI10.1002/2013GL058819