The Quiet-Sun Differential Emission Measure from Radio and UV Measurements
The Quiet-Sun Differential Emission Measure from Radio and UV Measurements
复制标题
无线电和紫外线测量的安静太阳差分发射测量
DOI：
10.1086/527285
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
F. Drago
中科院分区：
文献类型：
--
作者：
E. Landi;F. Drago
在目前的工作中，我们结合联合收割机紫外和无线电观测的安静的太阳，以确定平均安静的太阳大气的差分发射措施（DEM）从光球（5600 K）的日冕。紫外线强度已被用来限制DEM高于30，000 K，从1.5到345 GHz的无线电频谱已被用来扩展DEM测定到5600 K。在T <30，000 K时，射电观测比UV和EUV线提供了更可靠的DEM确定诊断工具。我们发现，当温度大于60，000 K时，得到的平均安静太阳DEM与文献中的曲线非常一致，但在10，000 - 30，000 K温度范围内，比以前的测定低1个数量级以上。本工作首次在无法使用紫外线和极紫外线的温度区域确定了低于10，000 K的DEM。
In the present work we combine UV and radio observations of the quiet Sun to determine the differential emission measure (DEM) of the average quiet solar atmosphere from the photosphere (5600 K) to the corona. UV line intensities have been used to constrain the DEM above 30,000 K, and the radio spectrum from 1.5 to 345 GHz has been used to extend the DEM determination down to 5600 K. Radio observations are shown to provide a much more reliable diagnostic tool for DEM determination than UV and EUV lines at T < 30,000 K. The resulting average quiet-Sun DEM that we found is in excellent agreement with curves from the literature for temperatures larger than 60,000 K, but is lower than previous determinations by more than 1 order of magnitude in the 10,000-30,000 K temperature range. The present work determines the DEM below 10,000 K for the first time, in a temperature region where UV and EUV lines cannot be used.