论文标题
2012年6月13日在800-2000 MHz范围内观察到的窄带尖峰
Narrowband spikes observed during the 13 June 2012 flare in the 800-2000 MHz range
论文作者
论文摘要
窄带（〜5 MHz）和短寿命（〜0.01 s）的尖峰在2012年6月13日的800-2000 MHz无线电光谱上具有三种不同的分布，并分析并进行了分析。我们将它们指定为SB（尖峰分布在宽带或频段中），SZ（分布在斑马样带中）和SBN（分布在宽和狭窄的频段中）。分析活性区域NOAA 11504的AIA/SDO图像，发现从1000 MHz上观察到的尖峰组之间的粗略对应关系，在AIA通道的时间概况中发现了从靠近领先的Sunspot的Flare sub-Arae的时间概况中。在尖峰类型中，SZ类型是最有趣的，因为它类似于斑马。因此，使用自动相关和互相关方法，我们将SZ和SBN尖峰与在相同频率范围内观察到的典型斑马进行比较。虽然SZ频段频率与其频率分离（220 MHz）的比率约为4、5和6，但在斑马中，频率条纹的分离约为24 MHz，比率约为50。此外，SZ频带的带宽构成了狭窄的跨度Spikes云的带宽。该比较表明SZ尖峰的产生方式与斑马不同，但与SBN尖峰类似。我们通过伯恩斯坦模式成功地符合SZ带频率。基于这种拟合，我们将SZ和SBN尖峰解释为使用Bernstein模式在模型中生成的尖峰。因此，SZ Spike源中的磁场和血浆密度分别估计约为79 g和8.4x10^9 cm-3。
Narrowband (~5 MHz) and short-lived (~0.01 s) spikes with three different distributions on the 800-2000 MHz radio spectrum of the 13 June 2012 flare are detected and analyzed. We designate them as SB (spikes distributed in broad band or bands), SZ (spikes distributed in zebra-like bands) and SBN (spikes distributed in broad and narrow bands). Analyzing AIA/SDO images of the active region NOAA 11504, a rough correspondence between groups of the spikes observed on 1000 MHz and peaks in the time profiles of AIA channels taken from the flare sub-area close to the leading sunspot is found. Among types of spikes the SZ type is the most interesting because it resembles to zebras. Therefore, using auto-correlation and cross-correlation methods we compare SZ and SBN spikes with the typical zebra observed in the same frequency range. While the ratio of SZ band frequencies with their frequency separation (220 MHz) is about 4, 5 and 6, in the zebra the frequency stripe separation is about 24 MHz and the ratio is around 50. Moreover, the bandwidth of SZ bands, which consists of clouds of narrowband spikes, is much broader than that of zebra stripes. This comparison indicates that SZ spikes are generated different way than the zebra, but similar way as SBN spikes. We successfully fit the SZ band frequencies by the Bernstein modes. Based on this fitting we interpret SZ and SBN spikes as those generated in the model with Bernstein modes. Thus, the magnetic field and plasma density in the SZ spike source is estimated as about 79 G and 8.4x10^9 cm-3, respectively.
