Regular Versus Diffusive Photospheric Flux Cancellation

Details Regular Versus Diffusive Photospheric Flux Cancellation Regular Versus Diffusive Photospheric Flux Cancellation

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...731l..39l&link_type=abstract

The Astrophysical Journal Letters, Volume 731, Issue 2, article id. L39 (2011).

Astronomy and Astrophysics

Astronomy

Magnetic Fields, Magnetic Reconnection, Sun: Photosphere

Scientific paper

Observations of photospheric flux cancellation on the Sun imply that cancellation can be a diffusive rather than regular process. A criterion is derived, which quantifies the parameter range in which diffusive photospheric cancellation should occur. Numerical estimates show that regular cancellation models should be expected to give a quantitatively accurate description of photospheric cancellation. The estimates rely on a recently suggested scaling for a turbulent magnetic diffusivity, which is consistent with the diffusivity measurements on spatial scales varying by almost two orders of magnitude. Application of the turbulent diffusivity to large-scale dispersal of the photospheric magnetic flux is discussed.

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