Solar cycle variation in energetic particle emissivity of the sun
Abstract
The present work analyzes the solar cosmic ray, PCA, and geomagnetic data obtained during the last three solar cycles in order to clarify the solar cycle variation in the energetic particle emissivity of the sun. Plots of the variations in annual mean of Zurich sunspot numbers, number of solar proton events per year, number of relativistic proton events (GLE's), and annual mean of the 27-day autocorrelation coefficient of the summation of Kp in the years 1941 through 1973 are presented. Longitudinal distributions of the central meridian passage dates of PCA-producing flares along the 27-day rotation chart are given for three periods and the whole 19th solar cycle. Also, the number of proton events per year, the months and element number of polyplet events, and the percentage of polyplet events among all the events per year for 1954 through 1964 are tabulated.
- Publication:
-
Solar-Terrestrial Physics, Volume 1
- Pub Date:
- 1974
- Bibcode:
- 1974stp.....1....1H
- Keywords:
-
- Emissivity;
- Proton Energy;
- Relativistic Particles;
- Solar Cycles;
- Solar Protons;
- Periodic Variations;
- Polar Cap Absorption;
- Solar Corpuscular Radiation;
- Solar Cosmic Rays;
- Solar Flares;
- Twenty-Seven Day Variation;
- Solar Physics