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arXiv 0901.3122astro-ph.SR
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从静止活动区热发射的日节点X射线望远镜探测:一个纳米耀斑信号?

Hinode X-Ray Telescope Detection of Hot Emission from Quiescent Active Regions: A Nanoflare Signature?

J. T. Schmelz, S. H. Saar, E. E. DeLuca, L. Golub, V. L. Kashyap, M. A. Weber, J. A. Klimchuk

摘要:

日本/美国/英国{ \it Hinode(Solar-B)}航天器上的X射线望远镜(XRT)探测到了来自静止活动区核心的发射,这与纳米耀斑加热一致。利用10个宽频带X射线滤光片及其组合的辐射通量建立了差分辐射测量(DEM)曲线。除了在Log T = 6.3-6.5处的预期活性区域峰之外,我们还发现在Log T $>$ 7.0处具有显著发射测量的高温组分。与主峰相比,这一排放量很弱-DEM下降了近三个数量级-这说明了以前的仪器没有观测到这一点。这也是与静止的活性区的光谱一致的:没有Fe XIX线观察到使用XRT DEM分布产生的CHIANTI合成光谱。DEM结果成功地再现了一个简单的两个组件的nanoflare模型。

英文摘要:

The X-Ray Telescope (XRT) on the Japanese/USA/UK {\it Hinode (Solar-B)} spacecraft has detected emission from a quiescent active region core that is consistent with nanoflare heating. The fluxes from 10 broadband X-ray filters and filter combinations were used to constructed Differential Emission Measure (DEM) curves. In addition to the expected active region peak at Log T = 6.3-6.5, we find a high-temperature component with significant emission measure at Log T $>$ 7.0. This emission measure is weak compared to the main peak -- the DEM is down by almost three orders of magnitude -- which accounts of the fact that it has not been observed with earlier instruments. It is also consistent with spectra of quiescent active regions: no Fe XIX lines are observed in a CHIANTI synthetic spectrum generated using the XRT DEM distribution. The DEM result is successfully reproduced with a simple two-component nanoflare model.

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