Query : 1998A&A...337..887Z

1998A&A...337..887Z - Astronomy and Astrophysics, volume 337, 887-896 (1998/9-3)

LRC-circuit analog of current-carrying magnetic loop: diagnostics of electric parameters.


Abstract (from CDS):

The equation for an equivalent LRC-circuit of current-carrying magnetic loop is obtained. It is suggested that the electric current, driven by the converging flows in the photosphere, flows trough the coronal part of a loop from one footpoint to another, and closes deep in the photosphere where plasma beta β≃1. In a self-consistent approach both the capacitance and the resistance of a LRC-circuit depend on the electric current along the loop. This opens new possibilities for the diagnostics of electric currents in coronal loops, by using data on high-quality modulation of microwave emission during flares. Spectral analysis of the Metsaehovi millimeter wave solar data for 16 solar flares have revealed modulation periods 0.7-17s which give currents I≃6x1010-1.4x1012A. For two of the events we could compare the total energy of the electric current stored in the magnetic loop with the energy released in the flare. Only 5% of the total energy of the electric circuit was released in both flares, suggesting a very low influence of these flares on the magnetic loop structure. In the studied events there was a tendency to decrease the energy release with the increase of the current. This tendency is interpreted in terms of plasma beta, which is getting smaller as the current grows. Therefore the plasma instabilities responsible for the flare process manifestate themselves weakly with the increase of the current.

Abstract Copyright:

Journal keyword(s): Sun: corona - Sun: flares - Sun: radio radiation

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* II Tau Er* 03 49 43.2760877136 +24 19 04.494227808   15.798 14.185 14.021   M4.6V 74 0
2 BD+20 2465 Er* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1225 0

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