Effects of whistler mode hiss waves on the radiation belts structure during quiet times

0485602 - ÚFA 2018 US eng A - Abstract
Ripoll, J.-F. - Santolík, Ondřej - Reeves, G. D. - Kurth, W. S. - Denton, M. - Loridan, V. - Thaller, D. - Cunningham, G. - Kletzing, C. - Turner, D. L. - Henderson, M. G. - Ukhorskiy, S. - Drozdov, A. - Villa, J. S. C. - Shprits, Y.
Effects of whistler mode hiss waves on the radiation belts structure during quiet times.
AGU Fall Meeting. s. l.: American Geophysical Union, 2017. SM51C-03.
[AGU Fall Meeting 2017. 11.12.2017-15.12.2017, New Orleans]
Institutional support: RVO:68378289
Keywords : electron radiation belts * whistler mode hiss wave * Van Allen Probes
Subject RIV: BL - Plasma and Gas Discharge Physics
https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/231263

We present dynamic Fokker-Planck simulations of the electron radiation belts and slot formation during the quiet days that can follow a storm. Simulations are made for all energies and L-shells between 2 and 6 in the view of recovering the observations of two particular events. Pitch angle diffusion is essential to energy structure of the belts and slot region. Pitch angle diffusion is computed from data-driven spatially and temporally-resolved whistler mode hiss wave and ambient plasma observations from the Van Allen Probes satellites. The simulations are performed either with a 3D formulation that uses pitch angle diffusion coefficients or with a simpler 1D Fokker-Planck equation based on losses computed from a lifetime. Validation is carried out globally against Magnetic Electron and Ion Spectrometer observations of the belts at all energy. Results are complemented with a sensitivity study involving different radial diffusion coefficients, electron lifetimes, and pitch angle diffusion coefficients. We discuss which models allow to recover the observed "S-shaped" energy-dependent inner boundary to the outer zone that results from the competition between diffusive radial transport and losses. Periods when the plasmasphere extends beyond L ~ 5 favor long-lasting hiss losses from the outer belt. Through these simulations, we explain the full structure in energy and L-shell of the belts and the slot formation by hiss scattering during quiet storm recovery.
Permanent Link: http://hdl.handle.net/11104/0280561