Certain characteristics of large-scale magnetic fields on the sun
Abstract
The characteristics are obtained by comparing the sun's general magnetic field, measured with a magnetograph, with the background field, determined on the basis of H-alpha maps. The average intensity of the magnetic field in the photosphere is found to be approximately 2.2 gauss. The intensity in the regions occupied by the S field is somewhat greater than in the regions of the N field. During the years 1973-1976, the primary period for the rotation of the large-scale fields was approximately 27.04-27.15 d; in 1976-1978, two period were observed, 26.75 d and 29.30 d. This is seen as the result of a shift toward the equator of the large-scale structures of the magnetic field of the old 11-year cycle and the formation of the high-latitude structures of a new cycle. It is also found that the background field in the N hemisphere, on the average, is positive (approximately +0.14 gauss), whereas in the S hemisphere it is negative (approximately -0.14 gauss). In the southern hemisphere, the magnetic structures are found to rotate somewhat faster than in the northern hemisphere. It is noted that this would be the case if the structures in the S hemisphere were closer to the equator than in the N hemisphere.
- Publication:
-
Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii
- Pub Date:
- 1980
- Bibcode:
- 1980IzKry..62..117K
- Keywords:
-
- Magnetic Field Configurations;
- Magnetic Measurement;
- Solar Activity;
- Solar Magnetic Field;
- Field Strength;
- Northern Hemisphere;
- Photosphere;
- Southern Hemisphere;
- Solar Physics