Photospheric vortices and coronal heating

Details Photospheric vortices and coronal heating Photospheric vortices and coronal heating

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..147...47z&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 147, no. 1, p. 47-53.

Physics

16

Coronal Loops, Photosphere, Solar Granulation, Solar Magnetic Field, Vortices, Magnetic Field Reconnection, Magnetic Flux, Vorticity

Scientific paper

We have used the results of a realistic simulation of convection to estimate the power input to coronal loops from the twisting of photospheric magnetic field in intergranular vortices. In this simulation, the vorticity is large (a mean of 0.03/s) nearly everywhere in the intergranular lanes, not merely at the corners of three granules. We found the autocorrelation time of vorticity images to be 45 s, but individual vortices last as long as 144 s. Our estimate suggests that field line twisting could supply a substantial fraction, if not all, of the required power to the quiet corona.

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