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A BROAD-BAND SPECTROMETER FOR DECIMETER AND MICROWAVE RADIO-BURSTS
FU, QJ; QIN, ZH; JI, HR; PEI, LB
1995-08-01
Source PublicationSOLAR PHYSICS
ISSN0038-0938
Volume160Issue:1Pages:97-103
Corresponding AuthorFU, QJ()
AbstractObservations of solar microwave bursts with high temporal and spectral resolution have shown interesting fine structures (FSs) of short duration and small bandwidth which are usually superimposed on the smooth continuum. These FSs are very intense (up to 10(15) K) and show sometimes a high degree of circular polarization (up to 100%). They are believed to be generated by electron cyclotron maser emission (ECME) in magnetic loops. Another type are the microwave type III bursts, which are drifting microwave FSs, and are probably the signatures of travelling electron beams in the solar atmosphere. The exact emission mechanisms for these phenomena, in particular the source configuration, the plasma parameters and the distribution of radiating electrons are not clear. For a detailed study of these problems new observations of intensity and polarization with high resolution in time and in frequency in decimeter and microwave wavebands are essential. In order to investigate these features in greater detail, spectrometers with high temporal and spectral resolution are being developed by the solar radio astronomy community of China (Beijing Astronomical Observatory (BAG), Purple Mountain Observatory (PMO), Yunnan Astronomical Observatory (YAO), and Nanjing University (NJU)). The frequency range from 0.7 to about 12 GHz is covered by about five spectrometers in frequency ranges of 0.7-1.4 GHz, 1-2 GHz, 2.4-3.6 GHz, 4.9-7.3 GHz, and 8-12 GHz, respectively. The radiospectrometers will form a combined type of swept-frequency and multi-channel receivers. The main characteristics of the solar radio spectrometers are: frequency resolution: 1-10 MHz; temporal resolution: 1-10 ms; sensitivity: better than 2% of the quiet-Sun level. We pay special attention to the sensitivity and the accuracy of polarization. Now, the 1-2 GHz radiospectrometer is being set up. The full system will be set up in 3-4 years.
WOS Keyword21 CM WAVELENGTH ; ELECTRON-BEAMS ; SOLAR ; EMISSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:A1995RV34900009
PublisherKLUWER ACADEMIC PUBL
Citation statistics
Cited Times:102[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8484
Collection期刊(老文献)
Corresponding AuthorFU, QJ
Affiliation1.NANJING UNIV,DEPT ASTRON,NANJING 210093,PEOPLES R CHINA
2.CHINESE ACAD SCI,PURPLE MT OBSERV,NANJING 210008,PEOPLES R CHINA
Recommended Citation
GB/T 7714
FU, QJ,QIN, ZH,JI, HR,et al. A BROAD-BAND SPECTROMETER FOR DECIMETER AND MICROWAVE RADIO-BURSTS[J]. SOLAR PHYSICS,1995,160(1):97-103.
APA FU, QJ,QIN, ZH,JI, HR,&PEI, LB.(1995).A BROAD-BAND SPECTROMETER FOR DECIMETER AND MICROWAVE RADIO-BURSTS.SOLAR PHYSICS,160(1),97-103.
MLA FU, QJ,et al."A BROAD-BAND SPECTROMETER FOR DECIMETER AND MICROWAVE RADIO-BURSTS".SOLAR PHYSICS 160.1(1995):97-103.
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