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A solar type U burst in the decimetric range
Yao, JX; Yu, XF; Tlamicha, A; Wei, FS; Antonucci, E; Shea, MA
1997
Source PublicationSUN AND ITS ATMOSPHERE
ISSN0273-1177
Volume20Issue:12Pages:2351-2354
AbstractThis paper analyzes a Type U burst at 1.0-2.8 GHz which occurred between 12:36:26 - 12:36:32 UT on 1992 August 22, observed by Ondfejov Observatory, Czech Republic. This may be the first example of Type U bursts in the decimetric range, as far as we know. From analysis we came to the following conclusion: (1) The frequency-drift rates of the ascending and descending branches are 1.25 and 0.225 GHz/s, respectively, and the velocities of the electron beam are 0.38 c and 0.26 c, respectively; (2) The burst decay of the ascending branch is larger than that of the descending branch; (3) The variations of the maximum frequencies of instantaneous spectra with time appear as from the highest (1.92 GHz) to the lowest (1.0 GHz), then toward higher frequency (1.53 GHz) (this is consistent with that predicted by plasma emission theory); (4) The bandwidths of the ascending branch are about twice that of the descending branch (this may be caused by the larger drift rates of the ascending branch); (5) The temperature of the coronal loop apex is 6.3 x 10(6) K; (6) The magnetic field at the top of the loop is greater than 9.2 G; (7) This U burst emission is plasma radiation at the second harmonic (C) 1997 COSPAR. Published by Elsevier Science Ltd.
Subject AreaEngineering ; Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
Indexed ByISTP ; SCI
Language英语
WOS Research AreaEngineering ; Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
WOS SubjectEngineering, Aerospace ; Astronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS IDWOS:000071955600025
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8427
Collection期刊(老文献)
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Astron Inst Ondrejov Observ, Ondrejov 25165, Czech Republic
3.Chinese Acad Sci, Lab Numer Study Heliospher Phys, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Yao, JX,Yu, XF,Tlamicha, A,et al. A solar type U burst in the decimetric range[J]. SUN AND ITS ATMOSPHERE,1997,20(12):2351-2354.
APA Yao, JX,Yu, XF,Tlamicha, A,Wei, FS,Antonucci, E,&Shea, MA.(1997).A solar type U burst in the decimetric range.SUN AND ITS ATMOSPHERE,20(12),2351-2354.
MLA Yao, JX,et al."A solar type U burst in the decimetric range".SUN AND ITS ATMOSPHERE 20.12(1997):2351-2354.
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