Variations of two-level magnetic fields and Halpha -observations of the spot group on August 18 - 30, 1971.
Abstract
Results are reported for H-alpha observations of a large sunspot group and measurements of the magnetic field strengths in the 6302-A Fe I and 6103-A Ca I lines. Analysis of all the observational data shows that (1) all centers of activity in the group are situated in regions of contact between fields of opposite polarities; (2) sunspot activity increases both with the formation of new magnetic hills and spots in which the magnetic fields have the opposite polarity of the surrounding field and with separation from the main group of nuclei whose magnetic fields also have the opposite polarity of the surrounding field; (3) the upper-level magnetic field (measured in the 6103-A line) is greater than the lower-level one (measured in the 6302-A line) prior to flare activity in nearby sunspots; and (4) an increase in the strength of the upper-level field is also observed in connection with absorption ejecta and arched filamentary systems.
- Publication:
-
Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii
- Pub Date:
- 1974
- Bibcode:
- 1974IzKry..52...92B
- Keywords:
-
- Magnetic Variations;
- Solar Magnetic Field;
- Solar Spectra;
- Sunspots;
- Field Strength;
- H Alpha Line;
- Magnetic Field Configurations;
- Solar Activity;
- Solar Flares;
- Solar Physics