Polar magnetic field and impulses of solar activity.
Abstract
Polar magnetic field on the Sun has been changing their polarity every 11th year sunspot cycle. We have presented the results of analysis the polar magnetic field and their relation to mid-latitude 'impulses of solar activity' in 1996-2003. Using the SOHO/MDI data the flux of radial component of the magnetic field has been estimated for different latitudinal zones. It is found that the magnetic flux for north polar zone (from 78deg to 88deg) equals to about 1.5-1.7 x 10^22 Mx and it is about 2.3-2.5 x 10^22 Mx for south polar zone (from -88deg to -78deg). It is also revealed that the polar magnetic flux does not show any significant variations during the polar magnetic field reversals in both hemispheres, while the positive and negative parts of the magnetic flux do changing. For mid and low latitude regions the situation has been changing. Magnetic flux shows the solar cycle dependence and manifests 'impulses of solar activity'. The evolution of the polar magnetic field, magnetic flux at the photosphere and their relation to the coronal structures during the solar cycle are discussed, also.
- Publication:
-
35th COSPAR Scientific Assembly
- Pub Date:
- 2004
- Bibcode:
- 2004cosp...35.2089B