LRC-CIRCUIT ANALOG OF CURRENT-CARRYING MAGNETIC LOOP - DIAGNOSTICS OFELECTRIC PARAMETERS

The equation for an equivalent LRC-circuit of current-carrying magneti c loop is obtained. It is suggested that the electric current, driven by the converging flows in the photosphere, flows trough the coronal p art of a loop from one footpoint to another, and closes deep in the ph otosphere where plasma beta beta approximate to 1. In a self-consisten t approach both the capacitance and the resistance of a LRC-circuit de pend on the electric current along the loop. This opens new possibilit ies for the diagnostics of electric currents in coronal loops, by usin g data on high-quality modulation of microwave emission during flares. Spectral analysis of the Metsahovi millimeter wave solar data for 16 solar flares have revealed modulation periods 0.7-17 s which give curr ents I approximate to 6 x 10(10)-1.4 x 10(12) A. For two of the events we could compare the total energy of the electric current stored in t he magnetic loop with the energy released in the flare. Only 5% of the total energy of the electric circuit was released in both flares, sug gesting a very low influence of these flares on the magnetic loop stru cture. In the studied events there was a tendency to decrease the ener gy release with the increase of the current. This tendency is interpre ted in terms of plasma beta, which is getting smaller as the current g rows. Therefore the plasma instabilities responsible for the flare pro cess manifestate themselves weakly with the increase of the current.