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In situ observations of EMIC waves in O + band by the Van Allen Probe A


AuthorYu, Xiongdong; Yuan, Zhigang; Wang, Dedong; Li, Haimeng; Huang, Shiyong; Wang, Zhenzhen; Zheng, Qiao; Zhou, Mingxia; Kletzing, C.; Wygant, J.;
KeywordsEMIC waves; O+ ion torus; oxygen band; Van Allen Probes
AbstractThrough polarization and spectra analysis of the magnetic field observed by the Van Allen Probe A, we present two typical cases of O+ band EMIC waves in the outer plasmasphere or plasma trough. Although such O+ band EMIC waves are rarely observed, 18 different events of O+ band EMIC waves (16 events in the outer plasmasphere and 2 events in the plasma trough) are found from September 2012 to August 2014 with observations of the Van Allen Probe A. We find that the preferred region for the occurrence of O+ band EMIC waves is in L = 2-5 and MLT = 03-13, 19-20, which is in accordance with the occurrence region of O+ ion torus. Therefore, our result suggests that the O+ ion torus in the outer plasmasphere during geomagnetic activities should play an important role in the generation of EMIC waves in O+ band.
Year of Publication2015
JournalGeophysical Research Letters
Volume
Number of Pages
Section
Date Published02/2015
ISBN
URLhttp://doi.wiley.com/10.1002/2015GL063250
DOI10.1002/2015GL063250