同无黑子耀斑相协的微波爆发机制的探讨

1980—1984年期间,我们在云南天文台9375MHz,3653MHz和2902 HHz三个波段的射电观测资料中,查到11组微波爆发与无黑子耀斑相伴随。本文研究了这些爆发与耀斑的大气层高度,射电爆发类型以及通过落进峰值流量-时间图的位置,确认出爆发机制是活动区中作麦克斯韦分布电子的热轫致辐射。

STUDY OF MICROWAVE BURSTS ASSOCIATED WITH SPOTLESS FLARES

During 1980-1984, It is found that the spotless flares are associated with eleven groups of microwave burst in solar radio data observed with the radiotelescopes at 9375 MHz, 3653 MHz and 2902 MHz. In this paper, the temporal behavior and peak-flux-density of the microwave bursts are studied. They are long duration, small flux and gradual rise-and-fall events. Source size of microwave bursts is similar to spotless flare source, they may occur in low coronal layer or in chromospheric high layer. Finally, their emission mechanism are confirmed as thermal bremsstrahlung from electrons with Maxwellian distribution.