[P-EM13] Inner magnetosphere: Recent understanding and new insights

[PEM13-07] Electron scattering by isolated chorus elements observed near the magnetospheric equator

★Invited Papers

*Satoshi Kasahara¹, Yoshizumi Miyoshi², Shoichiro Yokota³, Yoshiya Kasahara⁴, Shoya Matsuda⁵, Ayako Matsuoka⁵, Kunihiro Keika¹, Tomoaki Hori², Iku Shinohara⁵ (1.The university of Tokyo, 2.Nagoya University, 3.Osaka University, 4.Kanazawa University, 5.Institute of Space and Astronautical Science)

Keywords:electron scattering, chorus waves

Theories have predicted significant pitch angle scattering of electron by chorus waves via cyclotron resonance, resulting in electron precipitation into the atmosphere and consequent auroral illumination. Recent observations of chorus waves at the equator, in conjunction with ground observations, have indicated that even a single chorus element can cause sufficient electron scattering causing auroral flashing. Here we report more direct, in-situ evidence that electrons are indeed scattered into the loss cone up to strong diffusion, by an isolated chorus element. We discuss the scattering rate based on the observed parameters.