Hαfiltergram observations of ellerman bombs and its magnetic reconnection model
Hαfiltergram observations of ellerman bombs and its magnetic reconnection model
复制标题
埃勒曼炸弹的Hαfiltergram观测及其磁重联模型
DOI：
10.1007/bf00626874
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发表时间：
1995
影响因子：
1.9
通讯作者：
X. Q. Li
中科院分区：
文献类型：
--
作者：
F. Hu;M. Song;X. Q. Li
根据赣榆站H α滤波图观测和对Ellerman弹的鉴别和统计工作，发现Ellerman弹常出现在成熟黑子的半影区。我们提出了一个等离子体团模型来解释一个典型炸弹的基本性质：寿命11分钟，直径15 × 107厘米，伴随的喷流速度10 ~ 40公里/秒，总能量1027尔格，Te 104 K。首先，数值模拟证明了等离子体团可以被磁浮力从太阳对流层中抬升出来。在等离子体团及其周围环境之间建立了强电流片，其中发生了特殊的MHD（具有等离子体有质动力）-电阻不稳定性。在磁场重联开始后，一个局部的爆炸性不稳定性envelope，其增长率是如此之高，以至于它允许在短时间内耗尽片中的“高温”粒子。这样，炸弹的温度可以保持不变，或者只略微上升。
From theHαfiltergram observations obtained at Ganyu station, identification and statistic works made for Ellerman bombs, it is found that they often occur in the superpenumbra area of a mature sunspot. We suggest a plasmoid model to account for the basic properties of a typical bomb: lifetime 11 min, diameter ∼ 5 × 107 cm, accompanying jet velocity ∼ 40 km/s, total energy ∼ 1027 erg,Te ∼ 104 K. First, a numerical simulation is made to prove that plasmoids can be lifted from the solar convective zone by magnetic buoyancy. Between the plasmoid and its surroundings a strong current sheet builds up in which a peculiar MHD (with plasma ponderamotive force) - resistive instability takes place. After the magnetic reconnection has begun, a local explosive instability ensues whose growth rate is so high that it allows the exhaustion of the ‘high temperature’ particles from the sheet in a short period. In this way, the temperature of a bomb may be kept unchanged or only rise slightly.