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Multi-wavelength analysis of CME-driven shock and Type II solar radio burst band-splitting
Astrophysics and Space Science ( IF 1.9 ) Pub Date : 2021-03-25 , DOI: 10.1007/s10509-021-03933-7
Shirsh Lata Soni , E. Ebenezer , Manohar lal Yadav

It is now well established that Coronal Mass Ejections (CMEs) may produce shocks in near Sun and interplanetary medium. A Type-II radio burst is characterized by shock and associated emission with very slow frequency drift rate (∼0.1 MHz/sec). A CME driven shock and their velocity, acceleration/deceleration signature can be observed by a Type-II solar radio burst which drifts with the shock speed and is split in bands of plasma radio emission. These emissions can be seen in radio spectrographs as split bands both in fundamental and harmonic frequencies close to a ratio of 1:2. In this paper, we present an analysis of a CME associated with a band splitting Type-II radio burst observed using multi-instruments in multi-wavelengths. We observed the CME event that occurred in 02 May 2013 (05:24 UT) and is associated with an M1.1 class solar flare from the active region NOAA 11731 located at N10W23 on the solar disk. We use the widely accepted Newkirk coronal density model to estimate the height in the solar atmosphere to compare our results. We conclude that the speed of CME is high enough to produce a Type-II solar radio burst. The analysis of this paper also involved an estimation of the coronal ambient magnetic field and its comparison with the empirical active region magnetic field model (Dulk and McLean in Sol. Phys. 57:279, 1978). This shows the good results. Observations provide sufficient evidence that the unusual patch signature in Type-II solar radio burst is due to the CME–CME interaction.



中文翻译:

CME驱动的冲击和II型太阳能射电突发频带分裂的多波长分析

现在已经确定,日冕物质抛射(CME)可能在太阳附近和行星际介质中产生电击。II型无线电脉冲串的特征是冲击和伴随的发射,其频率漂移率非常低(〜0.1 MHz / sec)。CME驱动的冲击及其速度,加速度/减速度信号可以通过II型太阳无线电脉冲爆发观察到,该脉冲随着冲击速度而漂移,并分为等离子无线电发射波段。这些发射在无线电频谱仪中可以看作是基频和谐波频率中接近1:2的比例的分裂频带。在本文中,我们介绍了与使用多波长多仪器观测到的与频带分裂II型无线电脉冲串相关的CME的分析。我们观察到CME事件发生在2013年5月2日(UT 05:24),并且与M1相关。来自活动区NOAA 11731的一级太阳耀斑,位于太阳磁盘上N10W23。我们使用广为接受的纽柯克日冕密度模型来估计太阳大气中的高度,以比较我们的结果。我们得出的结论是CME的速度足够高,可以产生II型太阳无线电脉冲串。本文的分析还涉及对日冕环境磁场的估计,并将其与经验有效区域磁场模型进行比较(Dulk和McLean in Sol。Phys。57:279,1978)。这显示了良好的结果。观测提供了充分的证据,表明II型太阳无线电脉冲串中异常的补丁签名是由于CME-CME相互作用引起的。我们使用广为接受的纽柯克日冕密度模型来估计太阳大气中的高度,以比较我们的结果。我们得出的结论是CME的速度足够高,可以产生II型太阳无线电脉冲串。本文的分析还涉及对日冕环境磁场的估计,并将其与经验有效区域磁场模型进行比较(Dulk和McLean in Sol。Phys。57:279,1978)。这显示了良好的结果。观测提供了充分的证据,表明II型太阳无线电脉冲串中异常的补丁签名是由于CME-CME相互作用引起的。我们使用广为接受的纽柯克日冕密度模型来估计太阳大气中的高度,以比较我们的结果。我们得出的结论是CME的速度足够高,可以产生II型太阳无线电脉冲串。本文的分析还涉及对日冕环境磁场的估计,并将其与经验有效区域磁场模型进行比较(Dulk和McLean in Sol。Phys。57:279,1978)。这显示了良好的结果。观测提供了充分的证据,表明II型太阳无线电脉冲串中异常的补丁签名是由于CME-CME相互作用引起的。本文的分析还涉及对日冕环境磁场的估计,并将其与经验有效区域磁场模型进行比较(Dulk和McLean in Sol。Phys。57:279,1978)。这显示了良好的结果。观测提供了充分的证据,表明II型太阳无线电脉冲串中异常的补丁签名是由于CME-CME相互作用引起的。本文的分析还涉及对日冕环境磁场的估计,并将其与经验有效区域磁场模型进行比较(Dulk和McLean in Sol。Phys。57:279,1978)。这显示了良好的结果。观测提供了充分的证据,表明II型太阳无线电脉冲串中异常的补丁签名是由于CME-CME相互作用引起的。

更新日期:2021-03-25
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