Estimation of the depths of initial anchoring and the rising-rates of sunspot magnetic structures from rotation frequencies of sunspot groups.

Details Estimation of the depths of initial anchoring and the rising-rates of sunspot magnetic structures from rotation frequencies of sunspot groups. Estimation of the depths of initial anchoring and the rising-rates of sunspot magnetic structures from rotation frequencies of sunspot groups.

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327..795j&link_type=abstract

Astronomy and Astrophysics, v.327, p.795-799

Astronomy and Astrophysics

Astrophysics

27

Sun: Sunspots, Sun: Rotation

Scientific paper

The mean variation of the `initial' rotation frequency of sunspot groups, with the life span of spot groups in the range 12 to 2 days, has its trend similar to the radial variation of plasma rotation frequency, {OMEGA}(r), across the convective envelope at 15° latitude as given by helioseismology. The mean variation, with age, of the rotation frequency of sunspot groups which live for 10-12 days in latitudes 10°-20° also has its trend similar to {OMEGA}(r). These results suggest: (i) In all latitudes, the magnetic structures (e.g, bunch of flux tubes) of spot groups which live for 2 days are initially anchored near the surface (radial distance r~650Mm), and those of spot groups which live successively longer are initially anchored in successively deeper layers, by ~21000km per day, (ii) the structures which yield spot groups living 10-12 days are initially anchored near the base of the convective envelope. For a spot group which lives 10-12 days in latitudes 10°-20°, the `anchoring layer' of its magnetic structure rises at a rate ~21000km/day, as the spot group ages.

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