PMO OpenIR  > 太阳活动的多波段观测研究团组
A quasi-periodic solar radio fluctuation at microwave band
Xu, FY; Huang, GL; Wu, HA
AbstractA rare but interesting solar radio fine structure, quasi-periodic fluctuations, on 25 August 1999 was observed at microwave band for the first time. They fluctuated initially at a nearly stable frequency level then at a reverse drift component up to 5.49 GHz. The individual fluctuation consists of a bi-directional drift component. The features are characterized by narrow bandwidth of Delta f/f <= 3%, quasi-periodicity of similar to 100 ms as well as a slowly reverse and a rapidly normal drift rates on the bi-directional drift component. The associated data of the Yohkoh soft and hard x-ray telescope and Nobeyama radio heliograph at 17GHz showed that there are several bright spots (i.e. inhomogeneities) along the soft x-ray loop, and the locations of both radio and soft x-ray sources are closely consistent. Therefore, the fluctuations are most likely caused by the inhomogeneities within a Bare loop. Based on the two-component atmospheric model, we suggest a three-component atmospheric model with large scale length lambda and small scale lengths lambda(1) and lambda(2) to describe equilibrium atmosphere and inhomogeneity, With the beam model, the characters of fluctuations may be interpreted reasonably by the quasi-equidistant inhomogeneity along a Rare loop.
KeywordLow Corona Flare Drift
Subject AreaPhysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000233799600069
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Xu, FY,Huang, GL,Wu, HA. A quasi-periodic solar radio fluctuation at microwave band[J]. CHINESE PHYSICS LETTERS,2005,22(12):3229-3232.
APA Xu, FY,Huang, GL,&Wu, HA.(2005).A quasi-periodic solar radio fluctuation at microwave band.CHINESE PHYSICS LETTERS,22(12),3229-3232.
MLA Xu, FY,et al."A quasi-periodic solar radio fluctuation at microwave band".CHINESE PHYSICS LETTERS 22.12(2005):3229-3232.
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