AI 中文总结
研究2007 - 2024年150 - 20 MHz频率范围的23次日冕II型射电爆发，通过统计分析发现其频率带宽与相关日冕物质抛射角宽度呈反相关，且多数情况下爆发高度小于日冕物质抛射高度，揭示大角度日冕物质抛射产生窄带II型辐射的位置特点。
AI 中文摘要
太阳II型射电爆发是太阳爆发性活动产生的激波表现。米波段或日冕II型爆发因其与日冕物质抛射驱动的激波相关而备受关注。研究II型爆发特性与相关日冕物质抛射之间的相关性，对理解日冕物质抛射对空间天气和地磁活动的影响很重要。我们对2007 - 2024年期间150 - 20 MHz频率范围内的23次日冕II型射电爆发进行了统计研究。将日冕II型爆发的频率带宽与相关日冕物质抛射的角宽度相关联，发现二者呈反相关，相关系数约为 -0.62。还推导了爆发开始时II型爆发的高度并与相关日冕物质抛射/激波的估计高度比较，除一个事件外，其余II型爆发事件中，II型爆发高度小于日冕物质抛射高度。结果表明大角度宽度的日冕物质抛射产生窄带II型辐射，且这些II型辐射可能产生于日冕物质抛射驱动激波的侧翼区域而非激波前沿。
英文摘要
Solar Type II radio bursts are manifestations of shocks produced by explosive and eruptive solar activities, such as solar flares and coronal mass ejections (CMEs). Metric range or coronal Type II bursts are interesting because of their association with CME-driven shocks. It is therefore important to examine the correlation between the properties of Type II bursts and the associated CMEs. This, in turn, would be useful in understanding the impact of CMEs on space weather and geomagnetic activity. We conducted a statistical study of 23 coronal Type II radio bursts in the frequency range 150-20 MHz, for the period spanning 2007-2024. We correlated the frequency bandwidth of coronal Type II bursts with the angular width of the associated CMEs. Our investigation showed an anti-correlation between the two quantities with a correlation coefficient of $\approx$ -0.62. We further deduced the height of the Type II bursts (r$_{Type II}$) at the onset time of the burst and compared them with the estimated height of the associated CMEs/shocks (r$_{CME}$). With the exception of one event, for the rest of the Type II burst events, r$_{Type II}$ was $<$ r$_{CME}$. The results suggest that the CMEs with large angular widths produce narrow-band Type II emissions, and these Type II emissions could possibly be produced in the flank region of the CME-driven shock rather than at the shock front.
Comments31 pages, 11 figures, and the manuscript has been accepted for publication in the Solar Physics Journal
