Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ijga....7i2003t&link_type=abstract
International Journal of Geomagnetism and Aeronomy, Volume 7, Issue 2, CiteID GI2003
Astronomy and Astrophysics
Astrophysics
Solar Physics, Astrophysics, And Astronomy: Solar Activity Cycle (2162), Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Solar Irradiance
Scientific paper
[1] New solar activity indices for the sunspot cycle minima were obtained from the Hα synoptic charts for 1887-2005, Ca II K observational data of the solar disk at Kodaikanal for 1907-1995. The Apz index determines the area of the polar zone occupied by the magnetic field of one polarity, and A(t) is the sum of squares of dipole and octupole magnetic moments. The L(t) index is the total length of magnetic neutral lines on the Hα synoptic chart, and K(t) characterizes the complexity of the topology pattern of the general magnetic field of the Sun. It is determined by the inverse number of crossings of neutral lines with the meridian net on the Hα chart. The R(t) index characterizes the correlation factor of the magnetic field polarities in the latitude zones +/-40o. The solar rotation index SSPD(t) is determined by the sum of the spectral density of the power of the magnetic field sector structures. The area of the Ca II K bright points at high latitudes is the S K (t) index. It has been shown that the 11-year cycles of Apz(t), A(t), L(t), K(t), R(t), SSPD(t), and S K (t) have maxima at the sunspot activity minimum and that they are ahead of the cycles of Wolf numbers, W(t), by 5-6 years.
Makarov Valentin I.
Tlatov Andrej G.
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