Observation of nonthermal energy distributions during the impulsive phase of solar flares
Observation of nonthermal energy distributions during the impulsive phase of solar flares
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DOI：
10.1086/165477
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发表时间：
1987-08
期刊：
影响因子：
--
通讯作者：
J. Seely;U. Feldman;G. Doschek
中科院分区：
文献类型：
--
作者：
J. Seely;U. Feldman;G. Doschek
通过美国空军P78-I航天器上飞行的海军研究实验室晶体光谱仪（SOLFLEX）记录的几次耀斑，测量了Fe XXV共振线和双电子卫星强度随时间的变化。Fe XXV共振线、Fe XXIV n = 2卫星线j和Fe XXIV n = 3卫星线d13的强度比表明，在耀斑的脉冲阶段发生了非热电子能量分布。对于形成j和d13卫星的电子能量（分别为4.7和5.8 keV），观察到在脉冲阶段期间的电子能量分布具有凸起或接近平坦。对于所研究的所有耀斑，硬X射线爆发发生在SOLFLEX数据中观察到的非热分布的时间附近。25篇参考文献。
The Fe XXV resonance line and dielectronic satellite intensities have been measured as functions of time for several flares recorded by the Naval Research Laboratory crystal spectrometer (SOLFLEX) flown on the US Air Force P78-I spacecraft. The intensity ratios of the Fe XXV resonance line, the Fe XXIV n = 2 satellite line j, and the Fe XXIV n = 3 satellite line d13 indicate that nonthermal electron energy distributions occur during the impulsive phase of the flares. For the electron energies at which the j and d13 satellites are formed (4.7 and 5.8 keV, respectively), the electron energy distributions during the impulsive phase are observed to have a bump or to be nearly flat. For all of the flares that were studied, hard X-ray bursts occurred near the time of the nonthermal distributions observed in the SOLFLEX data. 25 references.