VLA-BATSE observations of an intense solar decimetric and hard X-ray burst
VLA-BATSE observations of an intense solar decimetric and hard X-ray burst
复制标题
VLA-BATSE 对强烈太阳分米和硬 X 射线爆发的观测
DOI：
--
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
R. Willson
中科院分区：
文献类型：
--
作者：
R. Willson
我们讨论了由VLA在20厘米和90厘米同时探测到的多脉冲太阳爆发，以及在硬X射线波长的爆发和瞬变实验(BATSE)。与耀斑相关的20厘米辐射由两组相隔约4分钟的爆发组成。在两组爆发中都检测到了25keV以上的硬X射线发射，而90厘米的爆发只在第二组和更强的组中发生。每隔1.7点S的VLA快照图显示，这20厘米的爆发起源于一个相对较小的震源，位于东翼上方，高度约为1.8x10 Exp 10 cm。90厘米的爆裂范围更广，位于大约2.2x10exp 10厘米的高度。两个谱域中时间分布的相似性表明高能电子的共同注入，而时间延迟与从色球传播到日冕射电爆发地点的电子的传播时间一致。我们发现VLA辐射可能是捕获在大冕环中的电子的III型或IV型辐射，并且可以解释它的是等离子体辐射，而不是回旋同步辐射。
We discuss observations of a multiply impulsive solar burst that was detected simultaneously by the VLA at 20 and 90 cm and by the Burst and Transient Experiment (BATSE) at hard X-ray wavelengths. The flare-associated 20 cm emission consists of two groups of bursts about 4 min apart. Hard X-ray emission above 25 keV was detected during both groups of bursts, while 90 cm bursts occurred only during the second and more intense group. VLA snapshot maps at intervals of 1.7 s reveal that the 20 cm burst originates within a relatively compact source located above the east limb at a height of roughly 1.8 x 10 exp 10 cm. The 90 cm burst is more extended and lies at a height of roughly 2.2 x 10 exp 10 cm. The similarity of the time profiles in the two spectral domains suggests a common injection of energetic electrons, while the time delays are consistent with the travel times of electrons which propagate from the chromosphere to the sites of the coronal radio bursts. We find that the VLA emission is probably the type III or type IV radiation of electrons trapped in large coronal loops, and that plasma radiation, rather than gyrosynchrotron emission, can explain it.