Ⅱ型爆发与太阳活动

Analysis on Type Ⅱ Burst and Solar Activity

本文分析了１９８７年１月—１９９４年１２月ＳＧＤ发表的太阳射电米波Ⅱ型爆发与ＳＩＤ事件、Ｈα耀斑、Ｘ射线等的对应关系。结果表明：电离层突然扰动与米波Ⅱ型爆发的关系是密切的。有８６％的ＳＩＤ事件发生在Ⅱ型爆发之前，这可能是由于ＳＩＤ事件是由太阳的紫外线、Ｘ射线辐射引起。

In this paper we analyse the correlations among solar meterwave type Ⅱbursts, SID events, Hα flares and X-ray recored form Jan. 1987 to Dec. 1994. The result is that SID closely associated with meterwave type Ⅱ bursts and 86% of the SID occured before type Ⅱ bursts. This may indicate that SID events are caused by solar UV and X-ray radiation while slow drift type Ⅱ bursts are related with MHD shock waves produced by flares. When the shock waves transfer from the corona, electrons in front of the MHD shock wave excite plasma to radiate and then cause the type Ⅱbursts.