Dynamics of Energy Release in Single Flare Loop

Details Dynamics of Energy Release in Single Flare Loop Dynamics of Energy Release in Single Flare Loop

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...9954467z&link_type=abstract

Technical Report, PB99-135972; HUT-MET-29 ; Applied Physics Inst.

Physics

Solar Flares, Coronal Loops, Solar Radio Bursts, Solar Wind, Unsteady Flow, Convective Flow, Energy Dissipation, Photosphere, Chromosphere, Millimeter Waves, Solar Cycles, Electric Current, Magnetic Fields, Radio Telescopes

Scientific paper

Pulsating and explosive time profiles of mm-wave solar bursts observed at Metsahovi in terms of the energy release in single current-carrying loop are explained. We suppose that the electric current in a loop is driven by the photospheric convective flows. The flare occurs due to the flute instability which gives the penetration of partially ionized plasma of the chromosphere into the current channel of a loop and consequently the loop resistance grows by 8-10 orders of magnitude. The feedback of the deviation of the loop magnetic field on the energy release rate was taken into account. Two regimes of energy release are studied: (1) Pulsating energy release in rarefied current loop with plasma beta is much less than 1; (2) Explosive energy release in a loop with the gradient of gas pressure of about Ampere force. We have shown that using two mentioned regimes and its combination one can explain different time behavior of the flares, for example, several quasi-periodic pulses, and pulsations with increasing amplitude at pre-flash phase followed by explosive enhancement of the emission at flash phase.

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