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We present the main results obtained from the coordinated observations of solar radio noise storms organized by C.E.S.R.A. in May 1981. They concern the structure and polarization of radio sources, and the relation with the photospheric magnetic field. A model of coronal magnetic field, accounting for the observations, is briefly discussed. 相似文献
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Astrophysics and Space Science - 相似文献
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本文介绍了由捷克Ondˇrejov天文台观测到的 1 992年 8月 2 2日 1 2 :36 :2 6— 1 2 :36 :32UT发生的U型暴 ,U型暴的频率范围为 1 .0— 2 .8GHz,在国际上尚属首例 .从分析得到以下几点结论 :(1 )上下臂的频漂率分别为 1 .2 5和 0 .2 2 5GHz/s,其电子束流的速度分别为 0 .38c和 0 .2 6c ,它是由等离子体二次谐波发射造成的 .(2 )上升臂的爆发衰减时间常数大于下降臂的 .(3)频谱极大频率随时间变化呈现出从高频到低频再到高频的变化 .(4)上升臂的频宽大于下降臂的约一倍左右 ,这与上升臂频漂远大于下降臂的有关 .(5 )从频宽得到上、下臂的速度弥散分别为 (Δvv) a=0 .42和 (Δvv) d=0 .47. 相似文献
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A. Tlamicha 《Solar physics》1968,5(3):377-381
The spectrum and diameter of the source of the S-component emission (McMath Plage No. 244) observed on March 4, 1968 has been investigated at 3.3 mm, 4.3 mm, 8.5 mm, 2 cm, 9.1 cm, 21 cm, and 43 cm wavelengths.On leave of absence from the Astronomical Institute of the Czechoslovak Academy of Sciences, Observatory Ondfejov, Czechoslovakia.Operated by Associated Universities, Inc., under contract with the National Science Foundation. 相似文献
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H. Tanaka J. P. Castelli A. E. Covington A. Krüger T. L. Landecker A. Tlamicha 《Solar physics》1973,29(1):243-262
The absolute calibration of solar radio flux density in the microwave region, which showed considerable discrepancies until 1966, has become completely uniform through international cooperative work. A complete history is described to avoid confusion, and correction factors are derived to convert the published values into absolute values for long series of routine observations. It is also shown that the most reliable calibration can be made by using a large pyramidal horn and by using sky and room temperature as calibration standards.Abbreviation of Stations for Table II, Figures 2 and 3 BERL
Heinrich-Hertz-Institut, Berlin Adlershof
- BORD
The Observatory, the University of Bordeaux
- GORK
Radiophysical Research Institute, Gorky
- HIRA
Hiraiso Radio Observatory
- HUAN
Geophysical Institute of Peru, Huancayo
- IRKU
Irkutsk Radioastronomical Observatory
- KIEL
Radio Observatory, Kiel University
- Radio
Observatory, Kiel University
- KSLV
Kislovodsk Radioastronomical Observatory
- MANI
Manila Observatory
- ONDR
Ondejov Observatory
- OTTA
National Research Council, Ottawa
- PENT
Dominion Radioastronomical Observatory, Penticton
- SANM
Observatory of Cosmic Physics, San Miguel
- SAOP
Mackenzie University, Sao Paulo
- SGMR
Sagamore Hill Radio Observatory
- SYDN
University of Sydney
- TOKO
Tokyo Astronomical Observatory
- TYKW
Toyokawa Observatory, Nagoya University
- UCCL
Belgian Royal Observatory, Uccle 相似文献
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I. N. Garczyńska B. Rompolt A. O. Benz C. Slottje A. Tlamicha C. Zanelli 《Solar physics》1982,77(1-2):277-283
The 120 limb surges which have been observed by means of Wrocaw Observatory coronagraph from September 1966 to November 1977 are investigated. The evolution of surges was compared with the radio data during the surges. A correlation between radio bursts and the surges was found, particularly with chains of type I radio bursts, which is the first reliable correlation found of these bursts with non-radio events. The type I correlation only applied for surges without accompanying flare, of which 43% are correlated with this type of radio emission. In 23 of 30 associated events the start of a surge coincided within 5 minutes with the start or an enhancement of the type I storm. If flares were present, the association was not significant.We also compared the maximum height reached by a surge with the frequencies of the radio bursts emitted at the same time and the maximum velocity of the rising surge with the frequency drift of type I chains. No such a correlation was however found.We discuss the possibility that surges are the result of a sudden energy input into the chromosphere related to the type I source in the corona. 相似文献
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The new 100–4200 MHz Ondejov radiospectrograph and the high-time resolution 3 GHz radiometer are described and the observations of fast drift bursts during the increased solar activity of September 5–7, 1992 are presented and analyzed. 相似文献
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