HIGH-VELOCITY EVAPORATION DURING THE IMPULSIVE PHASE OF THE 1984 APRIL 24 FLARE

被引:26
作者
ANTONUCCI, E
DODERO, MA
MARTIN, R
机构
[1] Istituto di Fisica Generale, University of Torino, Torino
[2] Istituto di Fisica Generale, University of Torino, 10125 Torino
关键词
Sun: flares; Sun: X-rays;
D O I
10.1086/191445
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present an analysis of the soft X-ray emission, detected with the bent crystal spectrometer (BCS) of the Solar Maximum Mission (SMM), during the initial part of the impulsive phase of the 1984 April 24 flare. In this period, soft X-rays are emitted uniquely by a moving source, which can be identified with plasma evaporating from the chromosphere with velocities between 100 and 800 km s-1, and they can be characterized by temperatures ranging from 1.5 × 107 K to values higher than 4 × 107 K. Three successive injections of evaporating plasma can be clearly distinguished. Each injection cycle is characterized by initially very high velocities; then, the maximum value in the velocity distribution progressively decreases until new plasma is injected at high velocity. The same behavior is observed for the temperature distribution, whose maximum decreases as well during an evaporation cycle. A mass and energy balance analysis ensures that plasma is almost continuously injected in the flaring loops during the period of observation of upflows.
引用
收藏
页码:137 / 146
页数:10
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