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Characteristics and Generation of Low-Frequency Magnetosonic Waves Below the Proton Gyrofrequency

We report a Van Allen Probes observation of large-amplitude magnetosonic waves with the peak intensity below the proton gyrofrequency (fcp), which may potentially be misinterpreted as electromagnetic ion cyclotron waves. The frequency spacing of the wave harmonic structure suggests that these magnetosonic waves are excited at a distant source region and propagate radially inward. We also conduct a statistical analysis of low-frequency magnetosonic waves below fcp based on the Van Allen Probes data from October 2012 to Decemb ...

Teng, Shangchun; Li, Wen; Tao, Xin; Ma, Qianli; Shen, Xiaochen;

YEAR: 2019     DOI: 10.1029/2019GL085372

Below the proton gyrofrequency; Low frequency magnetosonic wave; Van Allen Probes; wave generation; Wave propagation characteristics