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arXiv 2007.03852astro-ph.SR
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是什么决定太阳耀斑产生行星际类型的III射电爆发?

What determine Solar Flares Producing Interplanetary Type III Radio Bursts?

Y. K. Kou, Z. C. Jing, X. Cheng, W. Q. Pan, Y. Liu, C. Li, M. D. Ding

摘要:

高能电子被太阳耀斑加速后,往往会产生宽波段的III型射电爆发,当波长扩展到十米-千米时,甚至会产生行星际III型射电爆发(IT 3)。在这封信中,我们基于1996年至2016年观测到的2272个M级以上耀斑样本,研究了产生IT 3的耀斑的概率。结果表明,只有49.6%的耀斑伴随有IT 3。在频域中,有IT 3和无IT 3的耀斑的持续时间、峰值通量和注量都呈幂律分布,但前者的谱指数(2.06 $\pm$ 0.17、2.04 $\pm$ 0.18和1.55 $\pm$ 0.09)明显小于后者(2.82 $\pm$ 0.22、2.51 $\pm$ 0.19和2.40 $\pm$ 0.09),表明IT 3的耀斑具有较长的持续时间和较高的峰值通量。我们进一步研究的相关性日冕物质抛射(CME)的两组耀斑。结果表明,有IT 3的耀斑中有58%(655/1127)与日冕物质抛射有关,而无IT 3的耀斑中只有19%(200/1078)与日冕物质抛射有关,且IT 3耀斑的日冕物质抛射更宽、更快。这表明CME也可能在产生IT 3中发挥作用,推测促进了加速电子从低日冕逃逸到行星际空间。

英文摘要:

Energetic electrons accelerated by solar flares often give rise to type III radio bursts at a broad waveband and even interplanetary type III bursts (IT3) if the wavelength extends to decameter-kilometer. In this Letter, we investigate the probability of the flares that produce IT3, based on the sample of 2272 flares above M-class observed from 1996 to 2016. It is found that only 49.6% of the flares are detected to be accompanied with IT3. The duration, peak flux, and fluence of the flares with and without IT3 both present power-law distributions in the frequency domain, but the corresponding spectral indices for the former (2.06$\pm$0.17, 2.04$\pm$0.18, and 1.55$\pm$0.09) are obviously smaller than that for the latter (2.82$\pm$0.22, 2.51$\pm$0.19, and 2.40$\pm$0.09), showing that the flares with IT3 have longer durations and higher peak fluxes. We further examine the relevance of coronal mass ejections (CMEs) to the two groups of flares. It is found that 58% (655 of 1127) of the flares with IT3 but only 19% (200 of 1078) of the flares without IT3 are associated with CMEs, and that the associated CMEs for the flares with IT3 are inclined to be wider and faster. This indicates that CMEs may also play a role in producing IT3, speculatively facilitating the escape of accelerated electrons from the low corona to the interplanetary space.

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