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arXiv 2106.09310astro-ph.SR
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用CALLISTO谱仪探测高频型II爆发的趋势和特征

Trends and Characteristics of High-Frequency Type II Bursts Detected by CALLISTO Spectrometers

A. C. Umuhire, J. Uwamahoro, K. Sasikumar Raja, A. Kumar, C. Monstein, University of Rwanda, College of Science, Technology, Kigali, Rwanda, University of Rwand… 展开作者

A. C. Umuhire, J. Uwamahoro, K. Sasikumar Raja, A. Kumar, C. Monstein, University of Rwanda, College of Science, Technology, Kigali, Rwanda, University of Rwanda, College of Education, Rwanda, Indian Institute of Astrophysics, II Block, Koramangala, Bengaluru - 560 034, India, Department of Physics, University of Helsinki, P. O. Box 64, FI-00014 Helsinki, Finland, Istituto Ricerche Solari, Universit della Svizzera italiana, CH-6605 Locarno-Monti, Switzerland

摘要:

太阳射电II型爆发是即将发生的地球效应空间天气事件(如日冕物质抛射)的早期指标。为了研究高频II型爆发的起源(HF II型爆发),我们已经确认了其中的51个(在SWPC报告的180个II型爆发中),由地基复合天文低成本低频光谱仪和移动式天文台观测到在2010-2019年期间,将使用CALLISTO光谱仪,其上限频率截止(基波或谐波发射)在150 MHz-450 MHz之间。我们发现,60%的高频II型爆发,其上限频率截止$\geq$ 300 MHz的起源于西部的火山。此外,我们的研究发现,一个很好的相关性$\sim $ 0.73之间的平均冲击速度从无线电动力学谱和相应的速度从CME数据。此外,我们发现,分析HF II型爆发与广泛和快速的CME位于太阳盘附近。此外,我们还分析了其中两个高频II型爆发的时空特征,并将来自射电观测的时空特征与来自SOHO/LASCO和STEREO日冕仪的多航天器CME观测的时空特征进行了比较。

英文摘要:

Solar radio type II bursts serve as early indicators of incoming geo-effective space weather events such as coronal mass ejections (CMEs). In order to investigate the origin of high-frequency type II bursts (HF type II bursts), we have identified 51 of them (among 180 type II bursts from SWPC reports) that are observed by ground-based Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy and Transportable Observatory (CALLISTO) spectrometers and whose upper-frequency cutoff (of either fundamental or harmonic emission) lies in between 150 MHz-450 MHz during 2010-2019. We found that 60% of HF type II bursts, whose upper-frequency cutoff $\geq$ 300 MHz originate from the western longitudes. Further, our study finds a good correlation $\sim $ 0.73 between the average shock speed derived from the radio dynamic spectra and the corresponding speed from CME data. Also, we found that analyzed HF type II bursts are associated with wide and fast CMEs located near the solar disk. In addition, we have analyzed the spatio-temporal characteristics of two of these high-frequency type II bursts and compared the derived from radio observations with those derived from multi-spacecraft CME observations from SOHO/LASCO and STEREO coronagraphs.

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。

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