LONG-DURATION LOW-FREQUENCY TYPE III BURSTS AND SOLAR ENERGETIC PARTICLE EVENTS
LONG-DURATION LOW-FREQUENCY TYPE III BURSTS AND SOLAR ENERGETIC PARTICLE EVENTS
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长时间低频 III 型爆发和太阳高能粒子事件
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
P. Mäkelä
中科院分区：
文献类型：
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作者：
N. Gopalswamy;P. Mäkelä
我们分析了2004年4月在10588活动区发生的三次复杂的、长时间的、低频的（<14 MHz） III型射电暴相关的日冕物质抛射（cme）、耀斑和II型射电暴。使用Wind/WAVES的数据在1和14 MHz处测量持续时间，远高于通常用于定义这些爆发的阈值（>15分钟）。三个III型爆发中有一个与II型爆发没有关联，II型爆发也缺乏能量为bbbb25 MeV的太阳高能粒子（SEP）事件。该事件的III型爆发的1 MHz持续时间（28分钟）接近于逐渐SEP事件和地面增强事件的III型持续时间的中位数。然而，没有发现SEP事件的迹象。另一方面，来自同一活动区域的另外两个III型脉冲持续时间相似，但伴随着II型脉冲；这些爆发还伴随着SOHO/ERNE探测到的SEP事件。这三个事件的日冕物质抛射具有相似的速度，耀斑的大小和持续时间也相似。本研究提示，发生复杂、持续时间长、频率低的III型脉冲并不是SEP事件的良好指标。
We analyzed the coronal mass ejections (CMEs), flares, and type II radio bursts associated with a set of three complex, long-duration, low-frequency (<14 MHz) type III bursts from active region 10588 in 2004 April. The durations were measured at 1 and 14 MHz using data from Wind/WAVES and were well above the threshold value (>15 minutes) normally used to define these bursts. One of the three type III bursts was not associated with a type II burst, which also lacked a solar energetic particle (SEP) event at energies >25 MeV. The 1 MHz duration of the type III burst (28 minutes) for this event was near the median value of type III durations found for gradual SEP events and ground level enhancement events. Yet, there was no sign of an SEP event. On the other hand, the other two type III bursts from the same active region had similar duration but were accompanied by WAVES type II bursts; these bursts were also accompanied by SEP events detected by SOHO/ERNE. The CMEs for the three events had similar speeds, and the flares also had similar size and duration. This study suggests that the occurrence of a complex, long-duration, low-frequency type III burst is not a good indicator of an SEP event.