arXiv 1609.047432016-09-15astro-ph.SR

日冕型III射电爆发及其X射线耀斑和行星际型III对应物

Coronal type III radio bursts and their X-ray flare and interplanetary type III counterparts

Hamish A. S. Reid, Nicole Vilmer

备注：: 11 pages, 6 figures, published in Astronomy and Astrophysics
发表信息：: A&A 597, A77 (2017)
DOI：: 10.1051/0004-6361/201527758

摘要：

III型爆发和硬X射线都由耀斑高能电子束产生。这两种辐射之间的联系已经在以前的许多研究中进行了调查，但没有统计研究将日冕和行星际III型爆发与X射线耀斑进行比较。使用100兆赫以上的日冕射电事件专门从III型爆发，我们重新审视了长期存在的问题：所有的日冕III型爆发有X射线对应。无线电强度和X射线强度之间是否存在相关性。100兆赫以上的X射线和射电信号与14兆赫以下的行星际III型爆发有关。我们分析了2002年至2011年的数据，从100 MHz以上的日冕III型爆发开始。我们使用大于6千电子伏的RHESSI X射线数据，列出了321个与III型爆发和X射线耀斑相关的事件，包括至少28%的III型事件的初始样本。我们检查了时间，强度，相关的GOES类，和任何行星际无线电签名。对于我们的321个事件，6 keV的X射线发射通常比频率大于100 MHz的III型爆发组持续更长时间。在低于327 MHz频率的III型射电通量和25-50 keV的X射线强度之间发现了弱相关性，在高X射线强度和低III型射电通量下没有事件。在54%的事件中观察到小于14 MHz的行星际III型爆发，当使用25-50 keV X射线观察事件时会增加。当25-50 keV的计数率超过每秒250个计数或170 MHz的通量大于1000 SFU时，存在更强的行星际关联，这与25 keV以上的高能电子和磁通量管延伸到高日冕的事件有关。平均而言，III型爆发的流量随着频率的降低而增加，速率随事件而变化。

英文摘要：

Type III bursts and hard X-rays are both produced by flare energetic electron beams. The link between both emissions has been investigated in many previous studies, but no statistical studies have compared both coronal and interplanetary type III bursts with X-ray flares. Using coronal radio events above 100 MHz exclusively from type III bursts, we revisited long-standing questions: Do all coronal type III bursts have X-ray counterparts. What correlation, if any, occurs between radio and X-ray intensities. What X-ray and radio signatures above 100 MHz occur in connection with interplanetary type III bursts below 14 MHz. We analysed data from 2002 to 2011 starting with coronal type III bursts above 100 MHz. We used RHESSI X-ray data greater than 6 keV to make a list of 321 events that have associated type III bursts and X-ray flares, encompassing at least 28 percent of the initial sample of type III events. We examined the timings, intensities, associated GOES class, and any interplanetary radio signature. For our 321 events, the X-ray emission at 6 keV usually lasted longer than type III burst groups at frequencies greater than 100 MHz. A weak correlation was found between the type III radio flux at frequencies below 327 MHz and the X-ray intensity at 25-50 keV, with an absence of events at high X-ray intensity and low type III radio flux. Interplanetary type III bursts less than 14 MHz were observed for 54 percent of the events, increasing when events were observed with 25-50 keV X-rays. A stronger interplanetary association was present when 25-50 keV count rates were above 250 counts per second or 170 MHz fluxes were greater than 1000 SFU, relating to more energetic electrons above 25 keV and events where magnetic flux tubes extend into the high corona. On average type III bursts increase in flux with decreasing frequency, the rate varies from event to event.

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