Solar gradual hard x-ray bursts and associated phenomena
Solar gradual hard x-ray bursts and associated phenomena
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DOI：
10.1086/164306
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发表时间：
1986-06
期刊：
影响因子：
--
通讯作者：
E. Cliver;B. Dennis;A. Kiplinger;S. Kane;D. Neidig
中科院分区：
文献类型：
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作者：
E. Cliver;B. Dennis;A. Kiplinger;S. Kane;D. Neidig
通过对白色日冕、H/sub alpha/和射电的研究，利用SMM上的硬X射线爆发光谱仪和ISEE 3上的X射线探测器观测到的10个渐变硬X射线爆发（GHB）样本的微波、分米制和米制数据发现：（1）硬X射线（略大于30 keV）光子能谱在GHB开始附近开始变硬，在事件的峰值期间系统地变硬，并在衰变阶段继续变硬（或至少没有变软）。(2)日冕物质抛射（CME）被观察到，或推断已经发生，与10个GHB中的至少9个相关，并且CME似乎先于GHB，时间从5到60分钟不等。(3)GHB的特点发生在后期阶段的主要耀斑，在一般情况下，在H/亚α/耀斑亮度和面积的变化在GHB是小的，并不相称与其相关的微波爆发峰值强度。(4)与GHB相关的厘米波长爆发具有相对较低的频谱最大值，并且与所观察到的硬X射线发射有关的微波丰富。(5)相关联的分米波群通常在从约0.1分钟到稍微> 1分钟的时间尺度上表现出显著的强度变化，与渐进的X射线/微波爆发的稍微> 10分钟的持续时间相比短。(6)GHB与一致度量II型爆发的关联性很差，与IV型或连续事件的关联性更强。«少
From an examination of the white light coronagraph, H/sub alpha/, and radio (microwave, decimetric, and metric) data associated with a sample of 10 gradual hard x-ray bursts (GHBs) observed with the Hard-X-Ray-Burst Spectrometer on SMM and the x-ray detector on ISEE 3, was found the following: (1) The hard (somewhat > 30 keV) X ray photon energy spectrum began to harden near the onset of the GHBs, became systematically harder through the peak of the events, and continued to harden (or at least did not become softer) during the decay phase. (2) A coronal mass ejection (CME) was observed, or inferred to have occurred, in association with at least nine of the 10 GHBs, and CMEs appeared to precede the GHBs, by times ranging from 5 to 60 minutes. (3) The GHBs characteristically occurred in the late phase of major flares; in general, the changes in H/sub alpha/ flare brightness and area during GHBs were small and not commensurate with their associated microwave-burst peak intensities. (4) The centimeter wavelength bursts associated with the GHBs had relatively low frequency spectral maxima, and were microwave rich in relation to the observed hard x-ray emission. (5) The associated decimetric bursts typically exhibited significantmore » intensity variations on time scales of from about 0.1 to somewhat > 1 minute, short in comparison with the somewhat > 10 minute durations of the gradual x-ray/microwave bursts. (6) The GHBs were poorly associated with the coincident metric type-II bursts and more strongly associated with type-IV or continuum events.« less