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题名: Doppler Shift Oscillations from a Hot Line Observed by IRIS
作者: Li, D.; Ning, Z. J.; Huang, Y.; Chen, N. -H.; Zhang, Q. M.; Su, Y. N.; Su, W.
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2017
卷号: 849, 期号:2, 页码:113-
英文摘要: We present a detailed investigation of the Doppler shift oscillations in a hot loop during an M7.1 flare on 2014 October 27 observed by the Interface Region Imaging Spectrograph. The periodic oscillations are observed in the Doppler shift of Fe XXI. 1354.09 angstrom (log T similar to 7.05), and the dominant period is about 3.1. minutes. However, such 3.1 minute oscillations are not found in the line-integrated intensity of Fe XXI. 1354.09 angstrom, AIA EUV fluxes, or microwave emissions. Solar Dynamics Observatory/AIA and Hinode/XRT imaging observations indicate that the Doppler shift oscillations locate at the hot loop-top region (>= 11 MK). Moreover, the differential emission measure results show that the temperature is increasing rapidly when the Doppler shift oscillates, but the number density does not exhibit the corresponding increases nor oscillations, implying that the flare loop is likely to oscillate in an incompressible mode. All of these facts suggest that the Doppler shift oscillations at the shorter period are most likely the standing kink oscillations in a flare loop. Meanwhile, a longer period of about 10. minutes is identified in the time series of Doppler shift and line-integrated intensity, GOES SXR fluxes, and AIA EUV light curves, indicating the periodic energy release in this flare, which may be caused by a slow mode wave.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17553
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