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Global distribution of electrostatic electron cyclotron harmonic waves observed on THEMIS

Ni, Binbin (author)
Thorne, Richard (author)
Liang, Jun (author)
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Angelopoulos, Vassilis (author)
Cully, Christopher (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Li, Wen (author)
Zhang, Xiaojia (author)
Hartinger, Michael (author)
Le Contel, Olivier (author)
Roux, Alain (author)
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 (creator_code:org_t)
2011
2011
English.
In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 38, s. L17105-
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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 (|lambda| < 3 degrees) over the region L <= 10 in the night and dawn MLT sector. ECH wave intensities within 3 degrees <= |lambda| < 6 degrees are generally much weaker but not negligible especially for L < similar to 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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