Characteristics of solar coronal source regions producing 3He-rich particle events
Characteristics of solar coronal source regions producing 3He-rich particle events
复制标题
太阳日冕源区产生富 3He 粒子事件的特征
DOI：
10.1007/bf00152032
复制
发表时间：
1987
期刊：
影响因子：
2.8
通讯作者：
M. Liggett
中科院分区：
文献类型：
--
作者：
S. Kahler;R. Lin;D. Reames;R. Stone;M. Liggett
我们使用Hα、X射线和千米射电数据来研究与在地球附近观测到的高能(∼1 MeV/Nucl−1)3He丰富粒子事件有关的日冕活动。这项研究的基础是Remes等人所报道的与脉冲2-100keV电子事件有关的12个富3He事件。(1985年)。我们发现，当Hα和X射线增亮可以与3He/电子事件相关联时，它们的起始点与相关联的度规III爆发的起始点重合在1分钟以内。在三到四个事件中，我们没有发现相关的Hα或X射线耀斑，在两个事件中，甚至连度规III型爆发都很弱或没有。测量的这些事件的低能(2keV)电子能谱表明，没有证据表明库仑碰撞损失导致了平坦化。这些结果和其他几个最近的发现与3He/电子事件是由于远高于相关Hα和X射线耀斑的日冕中的粒子加速而产生的观点一致。
We use Hα, X-ray, and kilometric radio data to examine the solar coronal activity associated with energetic (∼1 MeV/nucl−1) 3He-rich particle events observed near Earth. The basis of the study is the 12 3He-rich events observed in association with impulsive 2 to 100 keV electron events reported by Reames et al. (1985). We find that when Hα and X-ray brightenings can be associated with 3He/electron events, they have onsets coinciding to within 1 min of that of the associated metric type III bursts. In three or four events we found no associated Hα or X-ray flares, and in two events even the metric type III bursts were weak or absent. The measured low-energy (2 keV) electron spectra for these events show no evidence of a flattening due to Coulomb collisional losses. These results and several other recent findings are consistent with the idea that the 3He/electron events are due to particle acceleration in the corona well above the associated Hα and X-ray flares.