Frequency composition of long-period magnetic field variations of the sun as a star
Abstract
The frequency composition of the general magnetic field of the sun as a star is determined on the basis of Stanford observations, as well as linear and square-law detection of the field during the period June 1975-December 1990. Four groups of significant harmonics are identified: long-period (greater than about 1 yr), and 27-, 13-, and 9-d variations. A detailed analysis of the spectrum of diurnal values of B(s), B(s)-parallel, and B(s)-squared, as well as of their semiannual mean values and dispersions reveals a complex structure of long-period B(s) variations (about 20-, 6-, 2-, and 1-yr variations). The agreement of frequency characteristics of long-period B(s) variations with those of the interplanetary magnetic field is discussed. The cause of the 11-yr cyclicity appearing in the detected B(s) values is analyzed.
- Publication:
-
Astronomicheskii Zhurnal
- Pub Date:
- October 1992
- Bibcode:
- 1992AZh....69.1083R
- Keywords:
-
- Annual Variations;
- Magnetic Measurement;
- Photosphere;
- Solar Magnetic Field;
- Diurnal Variations;
- Frequency Distribution;
- Stellar Magnetic Fields;
- Solar Physics