微波爆发前太阳射电发射的周期振荡

本文分析了1979年1月一12月紫台3.2cm、10cm波段上的爆发资料,峰值流量增量ΔS/S≥50%的爆发共计25个,发现所有25个爆发的爆前记录曲线上都存在着周期从几秒一10几秒、振幅约为太阳非扰动分量l%的振荡。这种振荡一般先于爆发几小时或几天。但对于特大爆发,如47GB型爆发,在长时间持续振荡以后,往往在爆前几十分钟或几小时突归宁静,呈平滑记录;对于较小的爆发,脉冲爆或持续期较短的复杂爆,如3S型、20GRF型以及45C型,在振荡同爆发之间不存在记录曲线的宁静时段,而往往由振荡直接延续到爆发。因此微波辐射的这种振荡特性可能是耀斑区域储能过程的一种反映。 

PERIODIC OSCILLATION IN SOLAR RADIO EMISSION PRECEDING MICROWAVE BURST

In this paper we have analysed the burst data at 3.2cm and 10cm during the period January to December,1979.The bursts that the peak flux density increase-ment (S/S)≥50% amount to 25 and we find that there are oscillations on the preburst recording curves of all the 25 bursts,the period of the oscillation is from a few seconds to ten seconds and the amplitude is about 1% of the solar undisturbed component.Such a oscillation usually precede burst for a few hours or a few days,but for outstanding burst it will be disappeared for tens minuts or a few hours before burst,and without this phenomenon in smaller,impulsive and shorter complex bursts.Thus the oscillating characteristics may be a process of energy accumulation in flare region.