Other
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..611w&link_type=abstract
In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun
Other
Magnetic Helicity, Quiet Sun
Scientific paper
The flux of magnetic helicity through the solar photosphere has implications in diverse areas of current solar research, including solar dynamo modelling and coronal heating. Other researchers have investigated the flux of magnetic helicity from active regions; here, we do the same for quiet-sun magnetic fields. We derive a theoretical expression for the total helicity flux in terms of "mutual" and "self" helicities, which arise from the relative motions of separate flux elements and the time evolution of the quadrupole moments of individual magnetic flux elements, respectively. Using a tracking algorithm applied to high cadence, high resolution SOHO/MDI magnetograms, we determine the observed rate of mutual helicity flux in the quiet sun and compare these measurements with our theoretical predictions. The quiet-sun mutual helicity flux rate we find, ~1012 Mx2 s-1 cm-2, is negligible compared to published estimates of active region helicity flux rates.
Longcope Dana Warfield
Welsch Brian Thomas
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