On the Sun's magnetic field prior to maximum of the cycle 23

Astronomy and Astrophysics – Astronomy

Scientific paper

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Solar Magnetic Field, Solar Activity Cycles

Scientific paper

The large number of measurements of the mean magnetic field (MMF) of the Sun were made in the CrAO in 1999. These data are analysed together with the like measurements performed at four solar observatories in 1968 - 1999. It is shown that (1) during total 32-year interval the predominance of longitudinal magnetic field of southern polarity was observed on the Sun with the mean value of -0.009±0.005 Gs, (2) in 1999, MMF exhibited 4-sector structure which is more characteristic of epochs near minima of solar activity, (3) the standard deviation of MMF in 1999 equals to 0.48 Gs was significantly lower than that usually observed before solar activity maximum (≍0.82 Gs).

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