High energy solar cosmic rays detection by the Baksan air shower arrays, Andyrchy and Carpet , during 23rd solar cycle
Abstract
Total counting rate of two scintillation Baksan air shower arrays "Andyrchy" and "Carpet" was examined during Ground Level Enhancements (GLEs) observed in the 23rd cycle of solar activity. Significant excesses above the galactic cosmic ray background have been found during several GLE events. The magnitude of increases at the peak of intensity-time profiles during different GLEs amounts to 4-14 st.dev. (0.12-0.44% excess) by the 15-min data of "Andyrchy". The "Carpet" array has two times higher statistical accuracy than "Andyrchy" under the same observation conditions. The data of both Baksan shower arrays are compared with the neutron monitors data at Apatity and Moscow. The total counting rate of both arrays consists mainly of single detector events(one-fold). The counting rate of two-fold, three-fold and greater events are few percents of total one. One-fold component is produced by secondary single muons and by small local air showers (electrons and gamma rays). The energy of primary hadrons caused one- fold component is higher than that for neutron monitors and amounts a few tens of GeV. The data of two air shower arrays, "Andyrchy" and "Carpet", open a new interesting possibility to study solar cosmic rays in the energy range of few tens of GeV.
- Publication:
-
34th COSPAR Scientific Assembly
- Pub Date:
- 2002
- Bibcode:
- 2002cosp...34E.490A