无力磁通绳索中火炬能量释放的特性

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astronomy Letters-A Journal of Astronomy and Space Astrophysics Pub Date : 2023-10-03 DOI:10.1134/S1063773723050055
A. A. Solov’ev, E. A. Kirichek
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引用次数: 0

摘要

一根直的圆柱形、电屏蔽的磁通绳被认为是弱弯曲磁环的上部,其基点固定在光球中。磁通绳的所有参数都取决于一个变量——离其对称轴的距离。当通量绳上升到稀薄的太阳大气中时,阻止通量绳横向膨胀的外部压力不断下降。在其某个临界值处,磁通绳的纵向磁场在磁表面上消失,其中纵向电流根据要屏蔽的总电流的要求而改变其符号。同时,该表面附近的方位角流和无力参数无限期增长。由于这种生长,该表面附近的电子漂移速度超过了离子声速,导致等离子体离子声不稳定性的激发,从而触发耀斑能量释放。等离子体湍流区域的等离子体电导率下降了七个数量级。异常电阻率下的快速磁能耗散在等离子体中产生的感应电场大大超过了Dreicer极限。这解释了在磁场迅速减弱的区域中粒子的有效加速。
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Properties of the Flare Energy Release in Force-Free Magnetic Flux Ropes

A straight cylindrical, electrically shielded magnetic flux rope is considered as the upper part of a weakly curved magnetic loop whose footpoints are fixed in the photosphere. All parameters of the flux rope depend on one variable—the distance \(r\) from the axis of its symmetry. As the flux rope rises into the rarefied solar atmosphere, the external pressure keeping the flux rope from lateral expansion drops continuously. At some critical value of it the longitudinal magnetic field of the flux rope vanishes on the magnetic surface where the longitudinal electric current changes its sign in accordance with the requirement for the total current to be shielded. At the same time, the azimuthal current and the force-free parameter near this surface grow indefinitely. Because of this growth, the electron drift velocity near this surface exceeds the ion-sound speed, leading to the excitation of a plasma ion-sound instability as a trigger of flare energy release. The plasma conductivity in the region of plasma turbulence drops by seven orders of magnitude. Rapid magnetic energy dissipation at the anomalous resistivity generates an inductive electric field in the plasma that exceeds considerably the Dreicer limit. This explains the efficient acceleration of particles in the region where the magnetic field weakens rapidly.

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来源期刊
CiteScore
1.70
自引率
22.20%
发文量
0
审稿时长
6-12 weeks
期刊介绍: Astronomy Letters is an international peer reviewed journal that publishes the results of original research on all aspects of modern astronomy and astrophysics including high energy astrophysics, cosmology, space astronomy, theoretical astrophysics, radio astronomy, extragalactic astronomy, stellar astronomy, and investigation of the Solar system.
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