Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..475n&link_type=abstract
Astronomy Letters, Volume 24, Issue 4, July 1998, pp.475-480; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 554
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We analyze the 6-hour-long series of 22 photoheliograms obtained on June 24, 1989 with the Special photoheliograph of the Pulkovo Observatory. We solve the classical problem of constructing the velocity field by the method of tracers; to this end, we use our own precision technique for determining the B_L coordinates and a unique (in size) sample of 130 magnetic fragments in 19 sunspots. We study the spatial distribution of magnetic fragments and the magnitude and direction of their horizontal velocity in the sunspot polar rho_theta coordinate system by normalizing and averaging the observational data for different sunspots. The data from the Debrecen catalog (520 magnetic fragments in 30 sunspots) are used to verify some of the results. We combine our empirical results into the self-consistent concept of a subphotospheric macrostructure of sunspot areas - into the picture of transformation of the horizontal magnetic field from a stable autowave spiral structure into a set of concentric rings in the layer of supergranulation convection.
Nagovitsyn Yu. A.
Nagovitsyna Elena Yu.
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