[P-EM12] Dynamics of the Inner Magnetospheric System

[PEM12-20] Parameterized Lifetime of Energetic Electrons due to Interactions with Chorus Waves

*Dedong Wang¹、Yuri Shprits^1,2,3 (1.Helmholtz Center Potsdam German Research Centre for Geosciences Potsdam、2.University of Potsdam、3.UCLA)

キーワード：radiation belt electrons, lifetime, chorus waves

Chorus waves can cause the loss of energetic electrons in the Earth's radiation belts and ring current via pitch-angle diffusion. We calculated the bounce-averaged quasi-linear diffusion coefficients to quantify these processes. In this study, using these diffusion coefficients, we parameterize the lifetime of the electrons with energy range from 1 keV to 2 MeV. In each magnetic local time (MLT), we calculate the lifetime for each energy and L-shell using two different methods. By applying polynomial fits, we parameterize the electron life time as a function of L-shell and electron kinetic energy in each MLT. we derive the lifetime parameterization as a function of geomagnetic activity (Kp index), L, magnetic local time (MLT) and energy of electrons. The parameterized electron lifetimes show a strong functional dependence on Kp, L-shell and electron energy. During the storm time, the lifetimes for higher energy (> 100 keV) electrons range from hours to days in the heart of the radiation belts. In contrast, the lifetimes for electrons with lower energy (< 100 keV) range from minutes to hours. This parameterization of electron lifetime is convenient for inclusion in simulations in the inner magnetosphere.