HINODE X-RAY TELESCOPE DETECTION OF HOT EMISSION FROM QUIESCENT ACTIVE REGIONS: A NANOFLARE SIGNATURE?
HINODE X-RAY TELESCOPE DETECTION OF HOT EMISSION FROM QUIESCENT ACTIVE REGIONS: A NANOFLARE SIGNATURE?
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HINODE X 射线望远镜检测静态活动区域的热发射：纳米耀斑特征？
DOI：
10.1088/0004-637x/693/2/l131
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Klimchuk
中科院分区：
文献类型：
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作者：
J. Schmelz;S. Saar;E. DeLuca;L. Golub;V. Kashyap;M. Weber;J. Klimchuk
日本/美国/英国 Hinode (Solar-B) 航天器上的 X 射线望远镜 (XRT) 检测到来自静态活动区域核心的发射，这与纳米耀斑加热一致。来自 10 个宽带 X 射线滤光片和滤光片组合的通量用于构建差分发射测量 (DEM) 曲线。除了 log T = 6.3–6.5 处的预期活动区域峰值外，我们还发现了一个在 log T > 7.0 处具有显着发射测量值的高温组件。与主峰相比，这种排放量测量值较弱（DEM 下降了近三个数量级），这说明了早期仪器并未观察到这种排放量。它也与静态活性区域的光谱一致：在使用 XRT DEM 分布生成的 CHIANTI 合成光谱中没有观察到 Fe xix 线。使用简单的二元纳米耀斑模型成功再现了 DEM 结果。
The X-Ray Telescope (XRT) on the Japanese/USA/UK 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 construct 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.