A sunspot decay mechanism

Details A sunspot decay mechanism A sunspot decay mechanism

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pazh....4..232i&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 4, May 1978, p. 232-234.) Soviet Astronomy Letters, vol. 4, May-June 1978, p. 127, 128.

Astronomy and Astrophysics

Astronomy

Atmospheric Turbulence, Decay Rates, Magnetohydrodynamic Waves, Solar Magnetic Field, Sunspots, Inflection Points, Magnetohydrodynamic Turbulence, Solar Activity

Scientific paper

A decay mechanism for sunspots is analyzed which involves turbulent Alfven-wave interaction with a strong magnetic field. The characteristic decay time of a sunspot is shown to depend strongly on the turbulent velocity amplitude and is estimated to be 70 days for a sunspot with a magnetic field of 3000 G, if the turbulent velocity is 2 km/s. The inflection point found in most sunspot decay curves is interpreted in terms of different rates of magnetic-field dissipation in two phases where the turbulence is degenerate and the degeneracy is removed as the magnetic field weakens.

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