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Statistical Results of the Power Gap Between Lower‐Band and Upper‐Band Chorus Waves
Author(s) -
Gao Xinliang,
Chen Lunjin,
Li Wen,
Lu Quanming,
Wang Shui
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl082140
Subject(s) - chorus , physics , frequency band , waveform , bandwidth (computing) , latitude , band gap , astrophysics , population , condensed matter physics , telecommunications , astronomy , voltage , art , literature , quantum mechanics , computer science , demography , sociology
The primary power gap of chorus waves is statistically investigated using 7‐year waveform data from THEMIS probes for the first time. Overall, ~2/3 of chorus events have a power gap between the lower and upper bands. Both the gap frequency and the frequency bandwidth of the gap have a broad distribution, which peaks at frequencies of ~0.49 f ce and ~0.07 f ce , respectively. The gap frequency tends to increase with increasing |MLAT| (magnetic latitude), while the frequency width gradually increases with L ‐shell. In most of banded events, the peak frequency of upper band is roughly twice that of lower band. Two types of events are studied. For Type I events, one population is located around P up / P low = 10 −1 , and the other is around P up / P low = 10 −3 . However, Type II events are roughly concentrated around P up / P low = 10 −3 . The gap frequency positively correlates with the frequency of upper band. Our study provides detailed observational constraints on potential mechanisms of the power gap formation.