D323 テアリング不安定性に伴うリコネクション・ジェット中の内部衝撃波と乱流領(D-32 宇宙流体(2),一般講演)

概要

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The space solar missions such as Yohkoh and RHESSI observe the hard X- and gamma-ray emissions from high energy particles in impulsive solar flares. The energization mechanism of these particles, however, is not known. In this paper, we suggest that the internal shocks are possible sites of particle acceleration. We examine how the magnetic reconnection creates the multiple shocks by performing two-dimensional resistive magnetohydrodynamic (MHD) simulations. We find that the current sheet becomes thin due to the tearing instability, and it collapses to Sweet-Parker sheet. The secondary tearing instability occurs in the thin sheet and creates many plasmoids. The fast reconnection starts by the onset of anomalous resistivity immediately after the plasmoid ejection. Internal shocks are created in the jet, because many plasmoids are ejected along the current sheet. We suggest that the multiple fast shocks are created within the jet and are possible sites of the particle acceleration.
日本流体力学会の論文
2004-08-09