论文标题
终止冲击是不寻常的太阳能无线电爆发的来源
Termination shock as a source of unusual solar radio bursts
论文作者
论文摘要
使用2003年11月18日和2004年9月12日的耀斑的厘米波和分分波太阳能无线电光谱观测，我们讨论了两种II类，如米波在仪表波时。无线电爆发表明，普通频率从高频向下漂移并停止，并且出现了从低频到高频的频率。对相应耀斑的所有数据的分析提供了形成准站立模式冲击（终止冲击，TS）的证据。 TS能够产生能量电子，这些电子负责出现硬X射线辐射的新来源以及快速无线电爆发（尖峰），纤维和斑马结构的产生。具有异常频率漂移的无线电发射带的来源位于耀斑循环的顶部（下TS）的顶部，或与爆发的突出或冠状质量弹出（CME，上TS）连接。太阳耀斑中普通等离子体参数的临界MACH数量的估计可在耀斑事件中轻松实现的值1.3。在太阳能电晕中的头盔形磁结构中可能发生异常无线电爆发所需的条件。
Using centimeter wave and decimeter wave solar radio spectral observations of the flares of November 18, 2003 and September 12, 2004, we have discussed two type II like bursts at the meter waves. The radio bursts show that the ordinary frequency drift from high to low frequencies slows down and stops, and a frequency drift from low to high frequencies appears. An analysis of all data on the corresponding flares provides evidence of formation of quasi standing fast mode shocks (termination shocks, TS). TS are able to generate energetic electrons, responsible for the appearance of new sources of hard X ray radiation and generation of fast radio bursts (spikes), fibers and zebra structures. The sources of the radio emission bands with the unusual frequency drift are situated above the top of the post flare loops (lower TS) or are connected with the erupting prominence or coronal mass ejection (CME, upper TS). Estimations of the critical Mach numbers for the ordinary plasma parameters in the solar flares give the values 1.3 easily realized in the flare events. The conditions necessary for generation of unusual radio bursts are likely to occur in the helmet shaped magnetic structures in the solar corona.
