Dynamic evolution of outer radiation belt electrons driven by superluminous R-X mode waves

Abstract

We present initial results on the temporal evolution of the phase space density (PSD) of the outer radiation belt energetic electrons driven by the superluminous R-X mode waves. We calculate diffusion rates in pitch angle and momentum assuming the standard Gaussian distributions in both wave frequency and wave normal angle at the location L=6.5. We solve a 2D momentum-pitch-angle Fokker-Planck equation using those diffusion rates as inputs. Numerical results show that R-X mode can produce significant acceleration of relativistic electrons around geostationary orbit, supporting previous findings that superluminous waves potentially contribute to dramatic variation in the outer radiation belt electron dynamics. wave-particle interaction, superluminous R-X waves, phase space density evolution, radiation belt electrons Citation:Xiao F L, Chen L X, He Y H, et al. Dynamic evolution of outer radiation belt electrons driven by superluminous R-X mode waves.

Direct Observation of L‐X Mode of Auroral Kilometric Radiation in the Lower Latitude Magnetosphere by the Arase Satellite

“…He et al., 2022; Jin et al., 2018; Guo et al., 2020; Guan et al., 2020; Q. Yang et al., 2016; C. Yang et al., 2022). Several works have demonstrated that AKR may accelerate or scatter the energetic electrons under the proper conditions (Li et al., 2023; Summers et al., 2001; Xiao, Chen, & He, 2010; Xiao, Chen, He, & Yang, 2010; Xiao, Su, et al., 2010; Xiao et al., 2006; Zhang et al., 2020). Those accelerated (or scattered) electrons can lead to considerable damage to spacecrafts (or destruction of ozone) (Baker, 2002; Callis et al., 1998; Thorne, 1977; Thorne et al., 2005).…”

Asymmetric Distributions of Auroral Kilometric Radiation in Earth's Northern and Southern Hemispheres Observed by the Arase Satellite

“…It is well known that wave‐particle interaction is an important process of magnetosphere‐ionosphere‐atmosphere coupling and has been studied widely by researchers (Q. Yang et al., 2016; Jin et al., 2018; Guo et al., 2020; Guan et al., 2020; C. Yang et al., 2021; He et al., 2021). Various studies have proved that AKR can produce efficient acceleration or pitch angle scattering of energetic electrons under appropriate conditions (Summers et al., 2001; Xiao, Chen, & He, 2010; Xiao, Chen, He, & Yang, 2010; Xiao et al., 2006; Xiao, Su, et al., 2010; Zhang et al., 2020). Those accelerated or scattered electrons can cause ozone destruction or serious damage to spacecrafts (Baker, 2002; Callis et al., 1998; Thorne, 1977; Thorne et al., 2005).…”

Quasi-linear modeling of gyroresonance between different MLT chorus and geostationary orbit electrons

“…Recently, some mechanisms have been proposed to account for the complicated and dramatic variation of electron radiation belts, such as adiabatic transport [17][18][19][20][21], radial diffusion [22][23][24] and wave-particle interaction [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Here, we focus on the dynamic evolution of electron radiation belts driven by the chorus waves.…”