arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.05726astro-ph.SR
收藏

与脉冲耀斑和渐变耀斑有关的SEP、射电强日冕物质抛射、低频II和III型射电爆发的统计特征

Statistical characteristics on SEPs, radio-loud CMEs, low frequency type II and type III radio bursts associated with impulsive and gradual flares

P. Pappa Kalaivani, A. Shanmugaraju, O. Prakash, R. -S. Kim

摘要:

我们统计分析了一组115个低频(十赫波长范围)II型和III型爆发,这些爆发与1997年至2014年观测到的主要太阳高能粒子(SEP:Ep > 10 MeV)事件及其太阳成因(如太阳耀斑和日冕物质抛射(CME))有关。根据太阳耀斑的持续时间,我们将它们分为两组:75个脉冲耀斑(持续时间< 60 min)和40个渐变耀斑(持续时间> 60 min),脉冲耀斑SEP事件(Rt = 989.23 min:2.86 d)的持续时间较短,与渐变耀斑(Rt =1275.45 min:3.34 d)相比,它们很快达到峰值强度(上升时间较短)。我们发现所有SEP的对数峰强度与CME(空间速度:cc = 0.52,SEcc = 0.083)和太阳耀斑(log积分通量:cc = 0.44,SEcc = 0.083)的性质之间有很好的相关性。对于这组主要SEP事件,这一特定结果没有明确区分耀斑相关和CME相关SEP事件。我们从Wind/WAVES观测到的射电动力学谱中导出了这些爆发的峰值强度、积分强度、持续时间和斜率。DH II型爆发的大部分属性(峰值强度,积分强度和起始频率)与脉冲和渐进耀斑事件被发现是相似的幅度。此外,我们还发现SEPs的属性和DH III型爆发的关键参数之间存在显着的相关性。这一结果表明,一个更密切的关联的峰值强度的SEP与DH III型射电暴的属性比DH II型射电暴的属性,至少对于这一组的115个主要SEP事件。

英文摘要:

We have statistically analyzed a set of 115 low frequency (Deca- Hectometer wavelengths range) type II and type III bursts associated with major Solar Energetic Particle (SEP: Ep > 10 MeV) events and their solar causes such as solar flares and coronal mass ejections (CMEs) observed from 1997 to 2014. We classified them into two sets of events based on the duration of the associated solar flares:75 impulsive flares (duration < 60 min) and 40 gradual flares (duration > 60 min).The impulsive flare-associated SEP events (Rt = 989.23 min: 2.86 days) are short lived and they quickly reach their peak intensity (shorter rise time) when compared with gradual flares associated events (Rt =1275.45 min: 3.34 days). We found a good correlation between the logarithmic peak intensity of all SEPs and properties of CMEs (space speed: cc = 0.52, SEcc = 0.083), and solar flares (log integrated flux: cc = 0.44, SEcc = 0.083). This particular result gives no clear cut distinction between flare-related and CME-related SEP events for this set of major SEP events. We derived the peak intensity, integrated intensity, duration and slope of these bursts from the radio dynamic spectra observed by Wind/WAVES. Most of the properties (peak intensity, integrated intensity and starting frequency) of DH type II bursts associated with impulsive and gradual flare events are found to be similar in magnitudes. In addition, we also found a significant correlation between the properties of SEPs and key parameters of DH type III bursts. This result shows a closer association of peak intensity of the SEPs with the properties of DH type III radio bursts than with the properties DH type II radio bursts, at least for this set of 115 major SEP events.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑