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The March 2015 Superstorm Revisited: Phase Space Density Profiles and Fast ULF Wave Diffusive Transport.

The March 2015 Superstorm Revisited: Phase Space Density Profiles and Fast ULF Wave Diffusive Transport.

Authors :
Ozeke, L. G.
Mann, I. R.
Claudepierre, S. G.
Henderson, M.
Morley, S. K.
Murphy, K. R.
Olifer, L.
Spence, H. E.
Baker, D. N.
Source :
Journal of Geophysical Research. Space Physics; Feb2019, Vol. 124 Issue 2, p1143-1156, 14p
Publication Year :
2019

Abstract

We present the temporal evolution of electron Phase Space Density (PSD) in the outer radiation belt during the intense March 2015 geomagnetic storm. Comparing observed PSD profiles as a function of L* at fixed first, M, and second, K, adiabatic invariants with those produced by simulations is critical for determining the physical processes responsible for the outer radiation belt dynamics. Here we show that the bulk of the accelerated and enhanced outer radiation belt population consists of electrons with K < 0.17 G1/2Re. For these electrons, the observed PSD versus L* profiles during the recovery phase of the storm have a positive radial gradient. We compare the observed temporal evolution of the PSD profiles during the recovery phase with those produced by radial diffusion simulations driven by observed Ultralow Frequency wave power as measured on the ground. Our results indicate that the dominant flux enhancement, inside L* < 5, in the heart of the outer radiation belt during the March 2015 geomagnetic storm is consistent with that produced by fast inward radial diffusion of electrons from a dynamic outer boundary driven by enhanced Ultralow Frequency wave power. Key Points: The March 2015 outer radiation belt flux enhancement was dominated by a population of accelerated low‐K electrons with K < 0.17 G1/2ReDuring the flux recovery phase no growing PSD peaks occurred inside L*≲5, suggesting local heating was not the dominant acceleration processThe observed flux enhancement inside L* < 5 is reproduced by our ULF wave radial diffusion simulation without including local acceleration [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
21699380
Volume :
124
Issue :
2
Database :
Complementary Index
Journal :
Journal of Geophysical Research. Space Physics
Publication Type :
Academic Journal
Accession number :
135496838
Full Text :
https://doi.org/10.1029/2018JA026326