Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spro.proc..381s&link_type=abstract
Solar Physics with Radio Observations, Proceedings of the Nobeyama Symposium, held in Kiyosato, Japan, Oct. 27-30, 1998, Edited
Physics
4
Scientific paper
Yohkoh observations of solar flares have revealed various types of evidence of magnetic reconnection, not only for large scale flares but also for small scale flares. Observations have also revealed that the association of mass ejections (plasmoids) with these flares is much more common than previously thought. On the basis of these new Yohkoh observations, we briefly (but critically) review various reconnection models of flares, and then discuss the plasmoid-induced-reconnection model, which is an extension of the CSHKP model but includes the following points as essential ingredients of nonsteady fast reconnection. Plasmoid formation and ejections are not simple by-products of reconnection, but play an essential role in storing energy (by inhibiting reconnection in the preflare phase) and by inducing strong inflow into reconnection region (by ejecting a huge amount of plasma in the impulsive phase). We shall also discuss how plasmoids are accelerated by global magnetic pressure and reconnection jets. It is stressed that the plasmoid-induced-reconnection model naturally explains both large and small scale flares, forming a basis of a unified model of flares.
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