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arXiv 1208.5904astro-ph.SR
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观测到高达212 GHz的双射电频谱爆发

A burst with double radio spectrum observed up to 212 GHz

C. G. Giménez de Castro, G. D. Cristiani, P. J. A. Simões, C. H. Mandrini, E. Correia, P. Kaufmann

摘要:

我们研究了2002年9月10日发生在活动区NOAA 10105的一次太阳耀斑,它开始于14:52 UT左右,在射电范围内持续了大约5分钟。该事件在X射线中被归类为M2.9,在Hα中被归类为1 N。太阳亚毫米波望远镜的观测,除了微波数据给我们一个很好的光谱覆盖范围在1.415和212 GHz之间。我们结合这些数据与紫外图像,硬和软X射线观测和全磁盘磁。从Ramaty高能太阳光谱成像数据获得的图像用于确定不同能量的X射线源的位置并确定X射线光谱,而紫外图像使我们能够表征日冕耀斑区域。利用迈克尔逊多普勒磁象图分析了活动区的磁场演化。在所有可用的无线电频率下检测到脉冲串。X射线图像(在12 keV和300 keV之间)显示了两个紧凑的源和212 GHz的数据,用于估计射电源的位置,显示了一个单一的紧凑的源从一个硬X射线足点位移25”。我们使用两个均匀的源来模拟无线电频谱,并将这种分析与硬X射线的分析相结合,以了解粒子的动力学。相对论粒子,在无线电波长超过50千兆赫观察到,有一个电子指数演变与典型的软-硬-软行为。

英文摘要:

We study a solar flare that occurred on September 10, 2002, in active region NOAA 10105 starting around 14:52 UT and lasting approximately 5 minutes in the radio range. The event was classified as M2.9 in X-rays and 1N in Hα. Solar Submillimeter Telescope observations, in addition to microwave data give us a good spectral coverage between 1.415 and 212 GHz. We combine these data with ultraviolet images, hard and soft X-rays observations and full-disk magnetograms. Images obtained from Ramaty High Energy Solar Spectroscopic Imaging data are used to identify the locations of X-ray sources at different energies and to determine the X-ray spectrum, while ultra violet images allow us to characterize the coronal flaring region. The magnetic field evolution of the active region is analyzed using Michelson Doppler Imager magnetograms. The burst is detected at all available radio-frequencies. X-ray images (between 12 keV and 300 keV) reveal two compact sources and 212 GHz data, used to estimate the radio source position, show a single compact source displaced by 25" from one of the hard X-ray footpoints. We model the radio spectra using two homogeneous sources, and combine this analysis with that of hard X-rays to understand the dynamics of the particles. Relativistic particles, observed at radio wavelengths above 50 GHz, have an electron index evolving with the typical soft-hard-soft behaviour.

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