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

Abstract

The contributions of dayside and nightside gyroresonance of chorus waves to electron radiation belt evolution at L = 6.6 are detailedly differentiated via fully solving the two-dimensional Fokker-Plank equation. The numerical results show that the chorus waves at different regions play significantly different roles. The dayside chorus waves can cause obvious loss of energetic electrons at lower pitch angles and weak energization at larger pitch angles. The nightside chorus waves can yield significant energization at larger pitch angles, but cannot efficiently resonate with the energetic electrons at lower pitch angle. Due to the numerical difficulty in fully solving Fokker-Planck equation, the cross diffusion terms are often ignored in the previous work. Here the effect of cross diffusion at different regions is further analyzed. On the dayside, ignoring cross diffusion overestimates the electron phase space density by several orders of magnitude at lower pitch angles, and consequently the dayside chorus waves are incorrectly regarded as an effective energization mechanism. On the nightside, ignoring cross diffusion overestimates the electron phase space density (PSD) by about one order of magnitude at larger pitch angles. These numerical results suggest that cross diffusion terms can significantly affect gyroresonance of chorus waves on both the dayside and nightside, which should be included in the future radiation belt models.

Radiation belt electron acceleration induced by gyroresonant interaction with magnetosonic waves

“…, and resonant interactions between electrons and electromagnetic waves (Summers et al 1998(Summers et al , 2007Horne et al 2005aHorne et al , 2005bNi et al 2009Ni et al , 2011Su et al 2010a;Xiao et al 2009Xiao et al , 2010Xiao et al , 2011aZhang et al 2012). As the energy transfer process, gyroresonant wave-particle interaction can explain the significant flux variation of the radiation belt particles.…”

Modeling the Evolution of Chorus Waves into Hiss Waves in the Magnetosphere

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In this study, we analyze Cluster observations of whistler-mode chorus and hiss waves during the event of August [19][20][21] 2006. Chorus is present outside the plasmasphere and hiss occurs inside the plasmasphere.

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