| Associations of decimetric type Ⅲ bursts with coronal mass ejections and Hα flares |
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| 作者单位： | Yuan Ma,Shuo Dai,Xue-Fei Zhang(National Astronomical Observatories of China/Yunnan Astronomical Observatory,Chinese Academy of Sciences,Kunming 650011,China);De-Yu Wang(Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210008,China);Jun Lin(National Astronomical Observatories of China/Yunnan Astronomical Observatory,Chinese Academy of Sciences,Kunming 650011,China;Harvard-Smithsonian Center for Astrophysics,Cambridge,MA 02138,USA) |
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| 基金项目： | the Ministry of Science and Technology of China under the 973 Program，the National Natural Science Foundation of China，the Chinese Academy of Sciences under the grant |
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| 摘 要： | We present a statistical study of decimetric type Ⅲ radio bursts,coronal mass ejections(CMEs),and Hα flares observed in the period from July 2000 to March2005.In total,we investigated 395 decimetric type Ⅲ radio burst events,21% of which showed apparent correlation to CMEs that were associated with Hα flares.We noticed that the Hα flares which were strongly associated with CMEs were gradual events,and82% of them took place before CMEs appeared in the field of view of LASCO C2;that most of the CME-associated radio bursts started in the frequency range around750 MHz with a frequency drifting rate of several hundred MHz s-1,of which both positive and negative ones were recognized; and that the correlation of type Ⅲ radio bursts to CMEs without associated flares is fairly vague,less than 9%.
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| 关 键 词： | Sun: magnetic fields — Sun: flares — Sun: radio bursts — Sun: coronal mass ejections |
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