NAOC Open IR  > 太阳物理研究部
Unusual zebra patterns in the decimeter wave band
Chernov, G. P.1,2; Yan, Yihua2; Fu, Qijun2; Tan, Chengming2; Wang, Shujuan2
Source PublicationSOLAR PHYSICS
AbstractAn analysis of new observations showing fine structures consisting of narrow-band fiber bursts as substructures of large-scale zebra-pattern stripes is carried out. We study four events using spectral observations taken with a newly built spectrometer located at the Huairou station, China, in the frequency range of 1.1-2.0 GHz with extremely high frequency and time resolutions (5 MHz and 1.25 ms). All the radio events were analyzed by using the available satellite data (SOHO LASCO, EIT, and MDI, TRACE, and RHESSI). Small-scale fibers always drift to lower frequencies. They may belong to a family of ropelike fibers and can also be regarded as fine structures of type III bursts and broadband pulsations. The radio emission was moderately or strongly polarized in the ordinary wave mode. In three main events fiber structure appeared as a forerunner of the entire event. All four events were small decimeter bursts. We assume that for small-scale fiber bursts the usual mechanism of coalescence of whistler waves with plasma waves can be applied, and the large-scale zebra pattern can be explained in the conventional double plasma resonance (DPR) model. The appearance of an uncommon fine structure is connected with the following special features of the plasma wave excitation in the radio source: Both whistler and plasma wave instabilities are too weak at the very beginning of the events (i. e., the continuum was absent), and the fine structure is almost invisible. Then, whistlers generated directly at DPR levels "highlight" the radio emission only from these levels owing to their interaction with plasma waves.
KeywordSun Flare Radio Emission Fine Structure
Indexed BySCI
WOS IDWOS:000257777400008
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.IZMIRAN, Troitsk 142190, Moscow Region, Russia
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Chernov, G. P.,Yan, Yihua,Fu, Qijun,et al. Unusual zebra patterns in the decimeter wave band[J]. SOLAR PHYSICS,2008,250(1):115-131.
APA Chernov, G. P.,Yan, Yihua,Fu, Qijun,Tan, Chengming,&Wang, Shujuan.(2008).Unusual zebra patterns in the decimeter wave band.SOLAR PHYSICS,250(1),115-131.
MLA Chernov, G. P.,et al."Unusual zebra patterns in the decimeter wave band".SOLAR PHYSICS 250.1(2008):115-131.
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