HIGH-ENERGY FLARE EXPLOSIONS DRIVEN BY 3-DIMENSIONAL X-TYPE CURRENT LOOP COALESCENCE

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タイトル別名
  • タイヨウ フレア ニ オケル デンリュウ ループ ガッタイ オ シメス コロナ
  • 太陽フレアにおける電流ループ合体を示すコロナ爆発

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説明

We present a model for high-energy solar flare explosions driven by 3-dimensional X-type current loop coalescence. The 3-dimensional X-type loop coalescence, where two crossed fluxtubes interact in one point, is a fundamentally new process as compared to the 1-D and 2-D cases studied earlier. It is shown that, following the strong plasma collapse due to pinch effect, a point-like plasma explosion can be driven and also fast magnetosonic shock waves can be excited; We found that the conditions in the area producing the remarkable flare bursts of 21 May 1984 were indeed such that the many flare spikes could have been due to 3-D explosive X-type current loop coalescence. We also show, by studing the conding the conditions of shock formation in a Gamma ray flare, that the time delay of γ-rays from the impulsive phase could be the time needed for the shock formation in the flaring region. We draw some general conclusions on the question why certain flares do emit γ-rays in the Mev energy range, and why other, apparently important and large flares, do not. We accentuate the fact that a well-developed high-energy flare has three phases of particle acceleration.

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