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Analyzing EMIC Waves in the Inner Magnetosphere Using Long-Term Van Allen Probes Observations

With 64-month magnetic data from Van Allen Probes, we have studied not only the global distribution, wave normal angle (θ), and ellipticity (ε) of electromagnetic ion cyclotron (EMIC) waves, but also the dependence of their occurrence rates and magnetic amplitudes on the AE* index (the mean value of AE index over previous 1 hr). Our results show that H+ band waves are preferentially detected at 5 <= L <= 6.5, in the noon sector. They typically have small θ (<30\textdegree) and weakly left-hand polarization but become more ...

Chen, Huayue; Gao, Xinliang; Lu, Quanming; Wang, Shui;

YEAR: 2019     DOI: 10.1029/2019JA026965

A long-term statistical work; EMIC wave; inner magnetosphere; spatial distribution; Van Allen Probes; Van Allen Probes observation; Wave fundamental characters