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EMIC wave parameterization in the long‐term VERB code simulation
Author(s) -
Drozdov A. Y.,
Shprits Y. Y.,
Usanova M. E.,
Aseev N. A.,
Kellerman A. C.,
Zhu H.
Publication year - 2017
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2017ja024389
Subject(s) - emic and etic , physics , van allen radiation belt , computational physics , solar wind , van allen probes , population , geophysics , cyclotron , mechanics , electron , nuclear physics , magnetosphere , plasma , demography , sociology , anthropology
Electromagnetic ion cyclotron (EMIC) waves play an important role in the dynamics of ultrarelativistic electron population in the radiation belts. However, as EMIC waves are very sporadic, developing a parameterization of such wave properties is a challenging task. Currently, there are no dynamic, activity‐dependent models of EMIC waves that can be used in the long‐term (several months) simulations, which makes the quantitative modeling of the radiation belt dynamics incomplete. In this study, we investigate Kp , Dst , and AE indices, solar wind speed, and dynamic pressure as possible parameters of EMIC wave presence. The EMIC waves are included in the long‐term simulations (1 year, including different geomagnetic activity) performed with the Versatile Electron Radiation Belt code, and we compare results of the simulation with the Van Allen Probes observations. The comparison shows that modeling with EMIC waves, parameterized by solar wind dynamic pressure, provides a better agreement with the observations among considered parameterizations. The simulation with EMIC waves improves the dynamics of ultrarelativistic fluxes and reproduces the formation of the local minimum in the phase space density profiles.