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Global distribution of electrostatic electron cyclotron harmonic waves observed on THEMIS
Author(s) -
Ni Binbin,
Thorne Richard,
Liang Jun,
Angelopoulos Vassilis,
Cully Chris,
Li Wen,
Zhang Xiaojia,
Hartinger Michael,
Le Contel Olivier,
Roux Alain
Publication year - 2011
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 - 10.1029/2011gl048793
Subject(s) - magnetosphere , physics , cyclotron , electron precipitation , van allen radiation belt , electron , geophysics , van allen probes , harmonic , equator , chorus , atmospheric sciences , plasmasphere , atomic physics , plasma , latitude , astronomy , nuclear physics , art , literature , quantum mechanics
A global, statistical analysis of electrostatic electron cyclotron harmonic (ECH) waves is performed using THEMIS wave data. Our results confirm the high occurrence of <1 mV/m ECH emissions throughout the outer magnetosphere (L > 5). The strongest (≥1 mV/m) ECH waves are enhanced during geomagnetically disturbed periods, and are mainly confined close to the magnetic equator (∣ λ ∣ < 3°) over the region L ≤ 10 in the night and dawn MLT sector. ECH wave intensities within 3° ≤ ∣ λ ∣ < 6° are generally much weaker but not negligible especially for L < ∼12 on the midnight side. Furthermore, the occurrence rates and variability of moderately intense (≥0.1 mV/m) ECH emissions suggest that ECH wave scattering could contribute to diffuse auroral precipitation in the outer (L > 8) magnetosphere where chorus emissions are statistically weak.
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