N-S asymmetry, area and longitudinal distributions of sunspots and their magnetic fields in different phases on the solar cycle 23.

Details N-S asymmetry, area and longitudinal distributions of sunspots and their magnetic fields in different phases on the solar cycle 23. N-S asymmetry, area and longitudinal distributions of sunspots and their magnetic fields in different phases on the solar cycle 23.

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh31a..06z&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH31A-06

Physics

7529 Photosphere, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance, 7544 Stellar Interiors And Dynamo Theory, 7594 Instruments And Techniques

Scientific paper

The statistical analysis of sunspot area and their magnetic field distributions are presented for the 1996-2004 data in the Solar Feature Catalogues (SFC) automatically extracted from the SOHO/NDI white light solar images and magnetograms. 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. There is also a strong North-South asymmetry in the longitudes of sunspots appearance that varies with the phase of the solar cycle. The magnetic field distributions for the total and excess fluxes on the sunspot heliospheric longitude and latitude are presented for different phases of the solar cycle. These statistical properties of sunspots and their magnetic field are discusses in compariosn with those predicted by the turbulent dynamo theory.

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