Parameters of Forbush Decreases and their Parent Flares in the Solar Cycle 1965-1976
Abstract
A total of 225 Forbush decrease effects (FD) were processed, for 115 of which corresponding flares were determined. The following parameters of FDs were determined from cosmic ray recordings at Deep River (1965 to 1972) and Calgary (1972-1976): the time lag of the beginning of FD behind the flare, the duration of the descending phase, the maximum decrease of FD in percent and the rate of decline phase. The number of FDs in the years of the 20th solar cycle (max. in 1970) and the distribution of flares over the disk was treated (including NS and EW asymmetry). The statistical distribution of the individual parameters of FDs and their mutual relations were investigated. The values of the FD parameters were also investigated with regard to the importance and to the longitudinal position of the flares. Some other relevant relations were interpreted from the point of view of the characteristics and shape of the magnetic plasma cloud.
- Publication:
-
Bulletin of the Astronomical Institutes of Czechoslovakia
- Pub Date:
- 1978
- Bibcode:
- 1978BAICz..29...30K
- Keywords:
-
- Forbush Decreases;
- Solar Cycles;
- Solar Flares;
- Cosmic Rays;
- Data Processing;
- Solar Activity Effects;
- Solar Radio Bursts;
- Statistical Distributions;
- Time Lag;
- Solar Physics