Observations of Hα Intensity Oscillations in a Flare Ribbon
Observations of Hα Intensity Oscillations in a Flare Ribbon
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耀斑带中 Hα 强度振荡的观察
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
F. Keenan
中科院分区：
文献类型：
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作者：
R. McAteer;P. Gallagher;Daniel S. Brown;D. S. Bloomfield;R. Moore;David R. Williams;M. Mathioudakis;A. Katsiyannis;F. Keenan
本文介绍了在大熊座太阳天文台用快速双像仪对一次C9.6耀斑进行的高拍频Hα蓝翼观测。小波和时间-距离方法被用来研究振荡功率沿着带，发现40-80秒的脉冲阶段的耀斑的周期。一项参数研究发现，统计上显着的强度振荡的振幅的3%的峰值耀斑振幅，周期为69秒（14.5兆赫）和振荡衰减时间为500秒。这些测得的属性是一致的耀斑引起的声波内的覆盖环路的存在。
High-cadence Hα blue wing observations of a C9.6 solar flare obtained at Big Bear Solar Observatory using the Rapid Dual Imager are presented. Wavelet and time-distance methods were used to study oscillatory power along the ribbon, finding periods of 40-80 s during the impulsive phase of the flare. A parametric study found statistically significant intensity oscillations with amplitudes of 3% of the peak flare amplitude, periods of 69 s (14.5 mHz) and oscillation decay times of 500 s. These measured properties are consistent with the existence of flare-induced acoustic waves within the overlying loops.