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Association between solar soft X-ray flares and microwave bursts
476
Abstracts
as the projection in the photosphere of the shear angle A$. In the case of highly inclined field configurations,the shear angle A$ is approximatelyequal to the angular shear, Ad. For the active region studied, the shear angle A$ gives a better and neater correspondencewith flare activities and a clearer explanation of the non-potential features than what A4 does. Key words: Sun - magnetic field - non-potentiality UBVRI photometric observations of supernova 19935 AApS 13/3 (1993) 295-296 ZHOU Xu, ZHENG Zhong-yuan and WU Hong (Beijing Astronomical Observatory) This short note provides our observations of SN1993J from April 7 to 29. The U, B, V, R, I photometry is obtained with Ford 2048 x 2048 CCD attached to SO/90 cm Schmidt telescope in Xinglong Station of Beijing Astronomical Observatory. The field size of the CCD image is about one square degree. Key words: supernova -SN1993J-photometric A study of the supernova SN1993J AApS 13f3 (1993) 297-298 HU Jing-yao, WANG Li-fan and JIANG Xiao-jun (Beijing Astronomical Observatory) LI Zong-wei (Beijing Normal University) Continuous spectrosscopic observation of SN1993J have been conducted in Beijing Observatory’s 2.16 meter telescope. We discuss in this letter the data obtained form April 7 to May 5, 1993. Investigations of the time evolution of the various absorption and emission lines show that the supernova debris is not spherically symmetric. Possible structures are discussed. Key words: supernova - SN1993J - spectrum Association between solar soft X-ray flares and microwave bursts AApS 13/3 (1993) 263-269 LI Chun-sheng (Department of Astronomy, Nanjing Vnivedty) ZHOU Shu-rong and XU Fu-ying (Ptwpfe Mountain Observatory) The statistical analysis of the appropriate physical parameters of solar soft X-ray (SXR) flares and microwave bursts occurring in four larger active regions (Boulder Nos. 5395, 5629, 5669 and 5680) in 1989 shows that their correlation coefficient R reach 0.9 5 R < 1. This fact indicates that there is a close association between SXR flares and microwave bursts. Such result can be interpreted by the physical process that a strong enough nonthermal electron beam injected downward from the microwave source (at the top of a flare loop) into the chromosphere is able to cause the chromospheric evaporation due to collision heating, the evaporated chromospheric plasma with superhot temperature T.(z 10’ K) moves upwards along the flare loop and emits SXR radiation. As the flare loop is filled with superhot plasma, the SXR emission reaches the peak flux. Thus the peak flux of SXR emission appears often later than that of microwave burst. Sun - microwave burst -soft X-ray flare Key words: A comparison between sunspot areas and sunspot number used in weather forecasting AApS 13f3 (1993) 278-282 GAO Yan-tian (Tianjin Meteorological Bureau) HUANG Yin-liang and FU Yuan-fen (Tianjin Institute of Technology) The sum of projection areas sunspots and sunspot number are used to predict the amount of preIt can be seen that the sunspot areas may be better than the cipitation of Tianjin in summer. sunspot number as the indices of solar activities for the weather forecasting. sunspot - solar-terrestrial relationship Key words:
Abstracts
as the projection in the photosphere of the shear angle A$. In the case of highly inclined field configurations,the shear angle A$ is approximatelyequal to the angular shear, Ad. For the active region studied, the shear angle A$ gives a better and neater correspondencewith flare activities and a clearer explanation of the non-potential features than what A4 does. Key words: Sun - magnetic field - non-potentiality UBVRI photometric observations of supernova 19935 AApS 13/3 (1993) 295-296 ZHOU Xu, ZHENG Zhong-yuan and WU Hong (Beijing Astronomical Observatory) This short note provides our observations of SN1993J from April 7 to 29. The U, B, V, R, I photometry is obtained with Ford 2048 x 2048 CCD attached to SO/90 cm Schmidt telescope in Xinglong Station of Beijing Astronomical Observatory. The field size of the CCD image is about one square degree. Key words: supernova -SN1993J-photometric A study of the supernova SN1993J AApS 13f3 (1993) 297-298 HU Jing-yao, WANG Li-fan and JIANG Xiao-jun (Beijing Astronomical Observatory) LI Zong-wei (Beijing Normal University) Continuous spectrosscopic observation of SN1993J have been conducted in Beijing Observatory’s 2.16 meter telescope. We discuss in this letter the data obtained form April 7 to May 5, 1993. Investigations of the time evolution of the various absorption and emission lines show that the supernova debris is not spherically symmetric. Possible structures are discussed. Key words: supernova - SN1993J - spectrum Association between solar soft X-ray flares and microwave bursts AApS 13/3 (1993) 263-269 LI Chun-sheng (Department of Astronomy, Nanjing Vnivedty) ZHOU Shu-rong and XU Fu-ying (Ptwpfe Mountain Observatory) The statistical analysis of the appropriate physical parameters of solar soft X-ray (SXR) flares and microwave bursts occurring in four larger active regions (Boulder Nos. 5395, 5629, 5669 and 5680) in 1989 shows that their correlation coefficient R reach 0.9 5 R < 1. This fact indicates that there is a close association between SXR flares and microwave bursts. Such result can be interpreted by the physical process that a strong enough nonthermal electron beam injected downward from the microwave source (at the top of a flare loop) into the chromosphere is able to cause the chromospheric evaporation due to collision heating, the evaporated chromospheric plasma with superhot temperature T.(z 10’ K) moves upwards along the flare loop and emits SXR radiation. As the flare loop is filled with superhot plasma, the SXR emission reaches the peak flux. Thus the peak flux of SXR emission appears often later than that of microwave burst. Sun - microwave burst -soft X-ray flare Key words: A comparison between sunspot areas and sunspot number used in weather forecasting AApS 13f3 (1993) 278-282 GAO Yan-tian (Tianjin Meteorological Bureau) HUANG Yin-liang and FU Yuan-fen (Tianjin Institute of Technology) The sum of projection areas sunspots and sunspot number are used to predict the amount of preIt can be seen that the sunspot areas may be better than the cipitation of Tianjin in summer. sunspot number as the indices of solar activities for the weather forecasting. sunspot - solar-terrestrial relationship Key words: