Sunspot Statistical Properties in the Cycle 23 from the Solar Feature Catalogue

Details Sunspot Statistical Properties in the Cycle 23 from the Solar Feature Catalogue Sunspot Statistical Properties in the Cycle 23 from the Solar Feature Catalogue

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp32a..05z&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP32A-05

Physics

7529 Photosphere, 7536 Solar Activity Cycle (2162), 7894 Instruments And Techniques

Scientific paper

The statistical analysis of sunspot area and magnetic field distributions in 1996-2004 are presented. The sunspot parameters are automatically extracted from the SOHO/NDI white light solar images (4 per day) and magnetograms (15 per day) and stored in the Solar Feature Catalogues (SFC). The number of sunspots is found to increase exponentially with the area decrease with a slightly increasing index from the solar minimum to its maximum. The N-S asymmetry in sunspot area distributions and its periodicity for different phases of the solar cycle and hemispheres is investigated with the period deduced. Longitudinal sunspot distributions also reveal a strong North-South asymmetry in the active longitude appearance and the relation to latitudinal distributions that depends on the phase of the solar cycle. The magnetic field distributions for the total and excess fluxes as a function of the sunspot heliospheric longitude and latitude are also presented for different phases of the solar cycle. These statistical properties of sunspots and their magnetic field are tested versus those predicted by the turbulent dynamo theory.

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