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Lower Hybrid Frequency Range Waves Generated by Ion Polarization Drift Due to Electromagnetic Ion Cyclotron Waves: Analysis of an Event Observed by the Van Allen Probe BWe analyze a wave event that occurred near noon between 07:03 and 07:08 UT on 23 February 2014 detected by the Van Allen Probes B spacecraft, where waves in the lower hybrid frequency range (LHFR) and electromagnetic ion cyclotron (EMIC) waves are observed to be highly correlated, with Pearson correlation coefficient of approximately 0.86. We assume that the correlation is the result of LHFR wave generation by the ions polarization drift in the electric field of the EMIC waves. To check this assumption the drift velocities of electrons and H+, He+, and O+ ions in the measured EMIC wave electric field were modeled. Then the LHFR wave linear instantaneous growth rates for plasma with these changing drift velocities and different plasma compositions were calculated. The time distribution of these growth rates, their frequency distribution, and the frequency dependence of the ratio of the LHFR wave power spectral density (PSD)parallel and perpendicular to the ambient magnetic eld to the total PSD were found. These characteristics of the growth rates were compared with the corresponding characteristics of the observed LHFR activity. Reasonable agreement between these features and the strong correlation between EMIC and LHFR energy densities support the assumption that the LHFR wave generation can be caused by the ions polarization drift in the electric field of an EMIC wave.
Document ID
20180000178
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Khazanov, G. V. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Boardsen, S. (Maryland Univ. Baltimore County Catonsville, MD, United States)
Krivorutsky, E. N. (Prime Circuits, Inc. Rockville, MD, United States)
Engebretson, M. J. (Augsburg Coll. Minneapolis, MN, United States)
Sibeck, D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chen, S. (Science Systems and Applications, Inc. Greenbelt, MD, United States)
Breneman, A. (Minnesota Univ. Minneapolis, MN, United States)
Date Acquired
January 5, 2018
Publication Date
January 21, 2017
Publication Information
Publication: Journal of Geophysical Research: Space Physics
Volume: 122
Issue: 1
ISSN: 2169-9402
Subject Category
Space Radiation
Physics (General)
Report/Patent Number
GSFC-E-DAA-TN50921
Funding Number(s)
CONTRACT_GRANT: NNG11PL02A
CONTRACT_GRANT: NAS5-01072
PROJECT: 673-2017-015
CONTRACT_GRANT: NNG17HP01C
Distribution Limits
Public
Copyright
Other
Keywords
Van Allen Probes
electromagnetic