Helioseismic and magnetic waves as signatures of energy transport mechanisms in solar flares

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Solar Flares, Seismic Wave, Electron Beam, Energy Deposition, Beam Momentum

Scientific paper

Recently reported helioseismic waves caused by a X-class solar flare propagating in the solar interior and observed in a form of ripples at the photosphere as well as magnetic field variations in the lower atmosphere associated with another X-class flares revived an interest to the problem of energy release and transport in solar flares. A comparison of simulations with the seismic observations revealed that a starting time of the wave coincides with the onset of the X-ray flare while the wave's amplitude corresponds to the energy momentum higher by half of order of the magnitude than the one observed. In the current paper electron beams are considered as alternative agents delivering energy directly to the photosphere. Depth variations of a momentum and energy deposition by beam electrons with the energy power law precipitating from the corona into a flaring atmosphere are calculated using the time-dependent kinetic solutions. A momentum brought by weak beams to lower chromospheric levels was found not to exceed of 1018 - 1019 whereas moderately intense and hard beams can deliver the momentum of (5 - 10)×1022 g cm/s. Energy deposition functions are also shown to increase with depths by about an order of magnitude at the lower chromosphere if Ohmic losses are included in addition to pure Coulomb collisions.

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