Sunspots motions in the 22^nd cycle of activity

Details Sunspots motions in the 22^nd cycle of activity Sunspots motions in the 22^nd cycle of activity

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e...8t&link_type=abstract

Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,

Physics

Scientific paper

We handled approximately 30 000 rows with data for 5744 sunspots, obtained on Debrecen Heliophysical Observatory, for years 1986-1989 and 1993-1995. By method of last squares we solved for each spot inverse relations between time of observation, angular distance from central meridian and latitude. On this way were obtained mean equatorial and mean meridional motion, giving parameters of rotation for 90 latitude zones width of one degree. The averaged sideral equatorial angular speed of rotation: omega = 2.91+/-0.01[micro rad/ day], and: A = -0.65+/-0/01 [micro rad/day] were obtained. Solving second inverse problem - Busso's equation, were derived characteristic equatorial periods for different latitudes, from sunspots meridional motion. We obtained values between 32 day on the pole, and 400 years for latitude 2.5 degree. Also, covariance of spot motions along equator and meridian is calculated for all 5744 spots in 90 degree of latitude, which fully confirmed Ward's model of angular moment transport.

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