[P-EM12] Dynamics of the Inner Magnetospheric System

[PEM12-13] Whistler Driven Electron Precipitation Measured by ELFIN CubeSat and Arase Spacecraft

*Xiaojia Zhang¹, Vassilis Angelopoulos¹, Anton V. Artemyev¹, Satoshi Kasahara², Colin Wilkins¹, Ethan Tsai¹, Shoichiro Yokota³, Kunihiro Keika², Tomoaki Hori⁴, Yoshizumi Miyoshi⁴, Yoshiya Kasahara⁵, Shoya Matsuda⁶, Ayako Matsuoka⁷, Mariko Teramoto⁸, Shun Imajo⁴, Iku Shinohara⁹ (1.University of California Los Angeles, 2.The Univ. of Tokyo, 3.Osaka Univ., 4.Nagoya Univ., 5.Kanazawa Univ., 6.ISAS, 7.Kyoto Univ., 8.Kyushu Institute of Technology, 9.ISAS, JAXA)

Keywords:Radiation Belts, Energetic Electron Precipitation, Whistler Mode Wave Scattering

Resonant interaction with whistler mode waves is the primary driver for electron acceleration and precipitation in Earth’s radiation belts. Although scattering rates and the resonant scattering process over long timescales can be well explained by quasi-linear theory, microphysics of electron resonant interaction with coherent, intense whistlers is still poorly understood. One important limitation is that most available observations lack direct measurements of electron fluxes within the loss cone, i.e., direct measurements of scattered electrons. High-energy (>50keV) electron flux measurements within the loss cone, as provided by the new low-altitude ELFIN CubeSats, can significantly advance our understanding of the scattering mechanism and their efficiency. In this presentation, we analyze ELFIN measurements in conjunction with near-equatorial Arase spacecraft. We focus on whistler-driven precipitation and discuss ELFIN measurements in different regimes of resonant electron scattering.