Temperature variability in X-ray bright points observed with Hinode/XRT

被引：23
|
作者：
Kariyappa, R. [1 ,2 ]
DeLuca, E. E. [2 ]
Saar, S. H. [2 ]
Golub, L. [2 ]
Dame, L. [3 ]
Pevtsov, A. A. [4 ]
Varghese, B. A. [1 ]
机构：
[1] Indian Inst Astrophys, Bangalore 560034, Karnataka, India
[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[3] LATMOS, F-78280 Guyancourt, France
[4] Natl Solar Observ, Sunspot, NM 88349 USA
来源：
ASTRONOMY & ASTROPHYSICS | 2011年 / 526卷
关键词：
Sun: corona; Sun:; X-rays; gamma rays; Sun: magnetic topology; INTENSITY OSCILLATIONS; CHROMOSPHERE; RECONNECTION; TELESCOPE; ROTATION; ENERGY; CORONA;
D O I：
10.1051/0004-6361/201014878
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Aims. We investigate the variability in temperature as a function of time among a sample of coronal X-ray bright points (XBPs). Methods. We analysed a 7-h (17:00-24:00 UT) long time sequence of soft X-ray images observed almost simultaneously in two filters (Ti_poly and Al_mesh) on April 14, 2007 with X-ray telescope (XRT) onboard the Hinode mission. We identified and selected 14 XBPs for a detailed analysis. The light curves of XBPs were derived using the SolarSoft library in IDL. The temperature of XBPs was determined using the calibrated temperature response curves of the two filters by means of the intensity ratio method. Results. We find that the XBPs show a high variability in their temperature and that the average temperature ranges from 1.1 MK to 3.4 MK. The variations in temperature are often correlated with changes in average X-ray emission. It is evident from the results of time series that the XBP heating rate can be highly variable on short timescales, suggesting that it has a reconnection origin.
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页数：6
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