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2013 GEM Workshop, Snowmass, CO

2013 GEM Workshop, Snowmass, CO Electron Pitch Angle Distributions Observed by the Van Allen Probes Chia-Lin Huang 1 , Harlan Spence 1 , Seth Claudepierre 2 , Joe Fennell 2 , Shri Kanekal 3 , and the RBSP ECT Team 1 University of New Hampshire, 2 Aerospace Corp, 3 NASA Goddard.

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2013 GEM Workshop, Snowmass, CO

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  1. 2013 GEM Workshop, Snowmass, CO Electron Pitch Angle Distributions Observed by the Van Allen Probes Chia-Lin Huang1, Harlan Spence1, Seth Claudepierre2, Joe Fennell 2 , Shri Kanekal3, and the RBSP ECT Team 1 University of New Hampshire, 2 Aerospace Corp, 3 NASA Goddard Electron Pitch Angle Distributions Van Allen Probes (or RBSP) : ECT-REPT and MagEIS Electron Pitch Angle Data Example of 3 types of PADs: Normal Isotropic • Types of Pitch Angle Distributions, fitted to : • Normal loss cone distribution with maximums at 90 degree (n > 0) • Isotropic or flattop distribution (n ~ 0) • Butterfly distribution with minimums at 90 degree (n < 0): possibly due to drift shell splitting or magnetopause shadowing Ogo-5 Pitch Angle Measurements Butterfly 2012 October Storms – REPT Data From RBSP-ECT SOC website 2013 January 26 and March 17 Storm Events – REPT and MagEIS Data West, 1979 n index n index • Summary: From electron pitch angle distributions, we can estimate the location of the spacecraft in the magnetosphere and understand the mechanisms controlling the space and time-varying radiation belt electrons. • Acknowledgement: BIG THANKS to the RBSP-ECT team! • Contact info: Chia-Lin.Huang@unh.edu

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