论文标题
关于太阳周期24中IV型太阳能无线电爆发的发生及其与冠状质量弹出的关联
On the occurrence of type IV solar radio bursts in the solar cycle 24 and their association with coronal mass ejections
论文作者
论文摘要
太阳活动,特别是冠状质量弹出(CME),通常伴随着仪表波长的辐射爆发。其中一些爆发的持续时间很长,并延伸到宽频带上,即IV型无线电爆发。但是,IV型爆发与冠状质量驱逐的关联仍然不太了解。在本文中,我们对太阳能周期中的IV型太阳无线电爆发进行了首次统计研究。我们的研究包括在此周期中发生的446种IV型无线电爆发。我们的结果表明,基于与白光CME观测值的时间关联,CMES伴随着明显的IV型爆发的$ \ sim 81 \%$。但是,我们发现CME中只有$ \ sim 2.2 \%$伴随着IV型无线电爆发。我们根据其光谱特征将IV型爆发归类为移动或静止的,并发现这项研究中IV总型爆发中只有$ \ sim 18 \%$是移动IV型爆发。我们的研究表明,“快速”($ \ geq 500 $ km/s)和“ slow”($ <500 $ km/s)可能会发生IV型爆发,也可能发生``wide''($ \ geq 60^{\ circ} $)和“ narrow”($ <narrow'($ <60^{\ 60^{\ circ} $)。但是,我们研究中的IV型爆发主要与“快速”和“宽” CME($ \ sim 52 \%$)相关,类似于II型无线电爆发。与II型爆发相反,固定的IV型爆发与所有CME类型具有更均匀的关联。
Solar activity, in particular coronal mass ejections (CMEs), are often accompanied by bursts of radiation at metre wavelengths. Some of these bursts have a long duration and extend over a wide frequency band, namely, type IV radio bursts. However, the association of type IV bursts with coronal mass ejections is still not well understood. In this article, we perform the first statistical study of type IV solar radio bursts in the solar cycle 24. Our study includes a total of 446 type IV radio bursts that occurred during this cycle. Our results show that a clear majority, $\sim 81 \%$ of type IV bursts, were accompanied by CMEs, based on a temporal association with white-light CME observations. However, we found that only $\sim 2.2 \%$ of the CMEs are accompanied by type IV radio bursts. We categorised the type IV bursts as moving or stationary based on their spectral characteristics and found that only $\sim 18 \%$ of the total type IV bursts in this study were moving type IV bursts. Our study suggests that type IV bursts can occur with both `Fast' ($\geq 500$ km/s) and `Slow' ($< 500$ km/s), and also both `Wide' ($\geq 60^{\circ}$) and `Narrow' ($< 60^{\circ}$) CMEs. However, the moving type IV bursts in our study were mostly associated with `Fast' and `Wide' CMEs ($\sim 52 \%$), similar to type II radio bursts. Contrary to type II bursts, stationary type IV bursts have a more uniform association with all CME types.