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 B

We 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 corre...

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Bibliographic Details
Published in:Journal of geophysical research. Space physics 2017-01, Vol.122 (1), p.449-463
Main Authors: Khazanov, G. V., Boardsen, S., Krivorutsky, E. N., Engebretson, M. J., Sibeck, D., Chen, S., Breneman, A.
Format: Article
Language:English
Subjects:
Correlation
Correlation coefficient
Cyclotrons
Density
Drift
Electric fields
Energy density
Frequency distribution
Frequency ranges
Geophysics
Ion cyclotron waves
Ions
Magnetic fields
Mathematical models
nonlinear phenomena
Noon
parametric processes
Physics (General)
Polarization
Probes
Space Radiation
Spacecraft
Spectra
Wave generation
Wave power
wave/wave interactions
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Summary:We 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.
ISSN:2169-9402
2169-9380
2169-9402
DOI:10.1002/2016JA022814