High-frequency oscillations in a solar active region observed with the RAPID DUAL IMAGER
High-frequency oscillations in a solar active region observed with the RAPID DUAL IMAGER
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使用 RAPID DUAL IMAGER 观测太阳活动区域的高频振荡
DOI：
10.1051/0004-6361:20077142
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发表时间：
2007
影响因子：
6.5
通讯作者：
F. Keenan
中科院分区：
文献类型：
--
作者：
D. Jess;A. Andic;M. Mathioudakis;D. S. Bloomfield;F. Keenan
介绍了对太阳活动区（NOAA 10794）的高节奏、同步、多波长光学观测。这些数据是由国家太阳观测站/萨克拉门托峰的邓恩太阳望远镜使用新开发的照相机系统：快速双成像仪获得的。小波分析进行搜索强度相关的振荡签名，和周期范围从20到370秒的显着性水平超过95%。在H-α蓝翼上的观测比在G-波段上的观测显示出更多的半影振荡现象。H-α振荡被解释为平均速度为20 km s −1的等离子体运动的特征。在H-α蓝翼和G-波段半影亮粒子上的强振荡功率是Evershed流频率高于以前报道的频率的指示。
High-cadence, synchronized, multiwavelength optical observations of a solar active region (NOAA 10794) are presented. The data were obtained with the Dunn Solar Telescope at the National Solar Observatory/Sacramento Peak using a newly developed camera system: the rapid dual imager. Wavelet analysis is undertaken to search for intensity related oscillatory signatures, and periodicities ranging from 20 to 370 s are found with significance levels exceeding 95%. Observations in the H-α blue wing show more penumbral oscillatory phenomena when compared to simultaneous G-band observations. The H-α oscillations are interpreted as the signatures of plasma motions with a mean velocity of 20 km s −1 . The strong oscillatory power over H-α blue-wing and G-band penumbral bright grains is an indication of the Evershed flow with frequencies higher than previously reported.