PMO OpenIR  > 太阳活动的多波段观测研究团组
Radio signature of magnetic reconnection and bi-directional shock waves in a flare-CME event on April 15, 1998
Huang, GL
2003-03-01
Source PublicationNEW ASTRONOMY
ISSN1384-1092
Volume8Issue:3Pages:213-229
AbstractA flare-CME event on April 15, 1998 is studied with data of Nobeyama Radio Polarimeters (NoRP) and Heliograph (NoRH), the radio spectrometers of Chinese National Astronomical Observatories (1.0-2.0 GHz and 2.6-2.8 GHz), and the Astrophysical Institute of Postdam (200-800 MHz), as well as the data of YOHKOH, SOHO, BATSE, and GOES. There were strong fluctuations superposed on the initial phase of the BATSE hard X-ray burst, and the radio burst at 1.0-2.0 GHz with a group of type III-like positive and negative frequency drift pairs, which may be interpreted as the process of magnetic reconnection or particle acceleration in corona. A type II-like burst with a series of pulsations at 200-800 MHz followed the maximum phase of the radio and hard X-ray burst, and slowly drifted to lower frequencies with typical zebra feature. After 10 thin of that, a similar dynamic spectrum was recorded at 2.6-3.8 GHz, where the type II-like signal drifted to higher frequencies with a series of pulsations and zebra structures. The polarization sense was strongly RCP at 2.6-3.8 GHz, and weakly LCP at 1.0-2.0 GHz, which was confirmed by the observations of NoRP. The radiation mechanism of these pulsations may be caused by the electron cyclotron maser instability. The local magnetic field strength and source height are estimated based on the gyro-synchrotron second harmonic emission. The ambient plasma density is calculated from the YOHKOH/SXT data. The ratio between the electron plasma frequency and gyro-frequency is around 1.3, which corresponds to the reversal value from extraordinary mode (LCP) to ordinary mode (RCP). Moreover, both the time scale and the modularity of an individual pulse increase statistically with the increase in the burst flux, which may be explained by the acceleration process of non-thermal electrons in the shock wave-fronts propagated upward and downward. Therefore, the radio observations may provide an important signature that flare and CME are triggered simultaneously by magnetic reconnection and are associated with the formation of bi-directional shock waves. (C) 2002 Elsevier Science B.V. All rights reserved.
KeywordSun : Flares Sun : Coronal Mass Ejections (Cmes) Shock Waves
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/S1384-1076(02)00203-8
WOS KeywordNONTHERMAL ELECTRONS ; BURSTS ; FIELD ; PULSATIONS ; RADIATION ; BAND ; GHZ
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000181686900004
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4618
Collection太阳活动的多波段观测研究团组
Affiliation1.Purple Mt Observ, Nanjing 210008, Peoples R China
2.Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Huang, GL. Radio signature of magnetic reconnection and bi-directional shock waves in a flare-CME event on April 15, 1998[J]. NEW ASTRONOMY,2003,8(3):213-229.
APA Huang, GL.(2003).Radio signature of magnetic reconnection and bi-directional shock waves in a flare-CME event on April 15, 1998.NEW ASTRONOMY,8(3),213-229.
MLA Huang, GL."Radio signature of magnetic reconnection and bi-directional shock waves in a flare-CME event on April 15, 1998".NEW ASTRONOMY 8.3(2003):213-229.
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