Short and long-term variations in the cosmic ray intensity and their connection with the 5303 Å coronal line intensity in solar cycle No. 20
✍ Scribed by N. Iucci; M. Parisi; G. Villoresi
- Publisher
- Springer
- Year
- 1973
- Tongue
- English
- Weight
- 664 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0038-0938
No coin nor oath required. For personal study only.
✦ Synopsis
The cosmic ray modulation in the period 1965-70 is investigated by the comparison of the intensity data of groundbased stations with different response to primaries. The socalled step-like modulation, already observed by other authors, is found to be produced by the overlapping between the quasi-stationary solar cycle modulation and the Forbush decrease events. Moreover a good correlation between the cosmic-ray variance (Forbush decrease index) and the 25303 coronal intensity at middle heliolatitudes (17.5~
~ is found, while the quasi-stationary solar cycle modulation is well correlated with the 25303 intensity near the solar equator (0~176
The different time behaviour of the solar activity at different heliolatitudes causes the step-like modulation.