[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)

Keywords: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.