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

In situ observations of EMIC waves in O+ band by the Van Allen Probe A
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范艾伦探针 A 对 O 波段 EMIC 波的原位观测

DOI:
10.1002/2015gl063250
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发表时间:
2015-03
影响因子:
5.2
通讯作者:
J. R. Wygant
J. R. Wygant
中科院分区:
地球科学1区
文献类型:
--
作者:
Yu Xiongdong;Zhigang Yuan;Dedong Wang;Haimeng Li;Shiyong Huang;Zhenzhen Wang;Zhen Qiao;Mingxia Zhou;C. A. Kletzing;J. R. Wygant

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通过对货车艾伦探针A观测到的磁场的偏振和频谱分析,给出了O+波段电磁离子回旋波在等离子体槽和外等离子体槽中的两种典型情况。虽然这种O+波段EMIC波很少被观测到,但从2012年9月到2014年8月,利用货车艾伦探测器A的观测,发现了18个不同的O+波段EMIC波事件(16个事件在外等离子体区,2个事件在等离子体槽中)。我们发现O ~+带EMIC波发生的优先区域是L = 2-5,磁局域时= 03-13,19-20,这与O ~+离子环的发生区域是一致的。因此,我们的研究结果表明,在地磁活动的外部等离子体磁层中的O+离子环在O+带EMIC波的产生中起着重要的作用。
Through polarization and spectra analysis of the magnetic field observed by the Van Allen Probe A, we present two typical cases of O+ band electromagnetic ion cyclotron (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 two 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 magnetic local time = 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.
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