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Resonant scattering and resultant pitch angle evolution of relativistic electrons by plasmaspheric hiss
Author  Ni, Binbin; Bortnik, Jacob; Thorne, Richard; Ma, Qianli; Chen, Lunjin; 
Keywords  Van Allen Probes 
Abstract  We perform a comprehensive analysis to evaluate hissinduced scattering effect on the pitch angle evolution and associated decay processes of relativistic electrons. The results show that scattering by the equatorial, highly oblique hiss component is negligible. Quasiparallel approximation is good for evaluation of hissdriven electron scattering rates <= 2 MeV. However, realistic wave propagation angles as a function of latitude must be considered to accurately quantify hiss scattering rates above 2 MeV, and ambient plasma density is also a critical parameter. While the firstorder cyclotron and the Landau resonances are dominant for hiss scattering < 2 MeV electrons, higherorder resonances become important and even dominant at intermediate pitch angles for ultrarelativistic (>= 3 MeV) electrons. Hissinduced electron pitch angle evolution shows an initially rapid transport from high to lower pitch angles, with a gradual approach toward equilibrium, and a final exponential decay as a whole. Although hiss scattering rates near the loss cone control the pitch angle evolution and the ultimate loss of ultrarelativistic electrons, the scattering bottleneck significantly affects the loss rate and leads to characteristic top hatshaped pitch angle distributions at energies < 1 MeV. Decay timescales are on the order of a few days, tens of days, and > 100 days for 500 keV, 2 MeV, and 5 MeV electrons, respectively, consistent with recent observations from the Van Allen Probes and indicating that scattering by hiss can realistically account for the longterm loss process and the pitch angle evolution of relativistic electrons in the plasmasphere following storm time injections. 
Year of Publication  2013 
Journal  Journal of Geophysical Research: Space Physics 
Volume  118 
Number of Pages  77407751 
Section  
Date Published  12/2013 
ISBN  
URL  http://doi.wiley.com/10.1002/2013JA019260 
DOI  10.1002/2013JA019260 