太阳短厘米波爆发中双重准周期脉动现象产生的可能机制

1990年5月23日0400—0451UT期间在遥隔两地的南大天文台与北师大天文台和北京天文台用时间分辨率1s和10ms分别在波长3.2cm、2cm和10.6cm上进行了太阳射电爆发的同时观测.发现了短厘米波爆发中的双重准周期脉动现象.本文根据这些观测资料连同S.G.D.发表的有关射电、光学和软X射线(SXR)耀斑等数据,提出了一个在耀(斑)环内非热与热辐射过程中由于相互作用而触发Alfven波和快磁声波的振荡模型,用来解释太阳短厘米波爆发中相关性很强的双重准周期脉动的起因和观测特征,并由此计算出爆发源区的平均物理参量T,N,B值。

A Possible Mechanism Generating the Dual Quasi-Periodic Pulsations in Solar Radio Bursts at Short Centimeter Waves

Using the data of quasi-periodic pulsations of solar radio bursts simultaneously observed with lime resolutions of Is and 10 ms by Nanjing University and Beijing Normal University at 9.375 GHz and 15 GHz respectively, during 0400-0451 UT on May 23, 1990, and along with the associated phenomena in radio, optical and soft X-ray emissions published in S. G. D., we proposed a physical mode of Alfven and fast magneto-acoustic oscillations, which were triggered due to the interactions between non-thermal (microwave burst) and thermal (soft X-ray flare) processes in a flare loop, to account for the origin.and observational characteristics of the quasi-periodic pulsations of solar radio bursts mentioned above. Besides, we also obtained the average-physical parameters N, T, B inside and underlying the flare kernel in the meantime.