Global distribution of electrostatic electron cyclotron harmonic waves observed on THEMIS

作者：Ni Binbin^*; Thorne Richard; Liang Jun; Angelopoulos Vassilis; Cully Chris; Li Wen; Zhang Xiaojia; Hartinger Michael; Le Contel Olivier; Roux Alain

来源：Geophysical Research Letters, 2011, 38: L17105.

DOI：10.1029/2011GL048793

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. Citation: Ni, B., R. Thorne, J. Liang, V. Angelopoulos, C. Cully, W. Li, X. Zhang, M. Hartinger, O. Le Contel, and A. Roux (2011), Global distribution of electrostatic electron cyclotron harmonic waves observed on THEMIS, Geophys. Res. Lett., 38, L17105, doi:10.1029/2011GL048793.

• 出版日期2011-9-7