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The fast and slow modes of solar flare 5.07.2009


V.A. Kovalev – Ph. D. (Phys.-Math.), Senior Research Scientist, Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of RAS I.G. Kostuchenko – Ph. D. (Phys.-Math.), Senior Research Scientist, Karpov Institute of Physical Chemistry M.I. Savchenko – Ph. D. (Phys.-Math.), Senior Research Scientist, Ioffe Physical-Technical Institute (St Petersburg) Y.E. Charikov – Ph. D. (Phys.-Math.), Senior Research Scientist, Ioffe Physical-Technical Institute (St Petersburg)

According to an extra-atmospheric observations sola flares of soft x-ray range by using the differential method is found that the phase of growth and decline represent the sequence of the fast and slow modes, likewise manifested in the behaviour of different рarameteres. Phase plasma heating consists of original fast hyperbolic process in which the time scale of the reduction is. Suppression of fast heating mode and fix the slow heating associated with the increase in radiative cooling, due to accelerated particles, causing a delay time «evaporation» chromosphere and the increased emission measure. The presence of quick mode is a test for the theoretical models. It is shown that for fast heating of the desired source from the temperature dependence of the power of the species ~Тβ, β > 1. As the heat source is considered collapsing trap, limited converging constrictions of the magnetic tube, in which while maintaining longitudinal adiabatic in-variant due to the Fermi mechanism is accelerated particles; in this case β = 3/2. A flare scenario is dissipation and transformation of energy of electric current or shock wave to spreading upwards from a photosphere through the arcade of magnetic tubes. A process is accompanied by constrictions of tubes, forming of the looked after in the Х-rayed range localized high temperature structures identified with сollapsing traps. Looked after two-stage reduction of measure of emission on the early phase of the rapid heating, it contingently reduction of factor of filling of source as a result of the turbulent heating accompanied by pinch of plasma. The necessity of account of effects of the rapid turbulent heating is shown for the theoretical models of flares. The gasdynamic response of atmosphere on flare plugs inсlude heating a chromosphere and «evaporation».


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