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Electromagnetic ion cyclotron wave modeling during the geospace environment modeling challenge event
Author(s) -
Chen Lunjin,
Jordanova Vania K.,
Spasojević Maria,
Thorne Richard M.,
Horne Richard B.
Publication year - 2014
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2013ja019595
Subject(s) - ring current , physics , geophysics , magnetosphere , geomagnetic storm , computational physics , magnetopause , cyclotron , proton , van allen probes , local time , emic and etic , storm , earth's magnetic field , atmospheric sciences , magnetic field , electron , meteorology , van allen radiation belt , nuclear physics , statistics , mathematics , quantum mechanics , sociology , anthropology
Abstract We investigate the temporal evolution and the spatial distribution of electromagnetic ion cyclotron (EMIC) waves during the 8–11 June 2001 geomagnetic storm, one of the storms selected for study by the Geospace Environment Modeling program. Generations of EMIC waves in the H + , He + , and O + bands are simulated using the kinetic ring current‐atmosphere interactions model with a self‐consistent magnetic field and a ray tracing code. Simulations show that strong wave gain occurs in the afternoon sector at L > 5 and overlaps with a high‐density plasmaspheric drainage plume. EMIC wave gain maximizes during the main phase and decreases in the recovery phase. We find that EMIC wave gain is stronger in the He + band than in the other two bands in the inner magnetosphere, except the region of low L (< 3) where the H + band is dominant due to an enhancement in the ring current anisotropy. Little wave gain is obtained for the O + band. Comparison with in situ EMIC events and EMIC event proxies at five geosynchronous satellites shows consistence in the temporal and local time evolution of the wave distribution. Our simulations of the EMIC wave distribution also agree with proton aurora at subauroral latitudes observed from the Imager for Magnetopause‐to‐Aurora Global Exploration satellite.