Arrival Directions of Large Air Showers Observed in the Southern Hemisphere
Abstract
The distributions of arrival directions of air showers above 10 to the 17th eV, observed until 1979 at Chacaltaya, are reported and compared with those obtained in the Southern Hemisphere by the Sydney group (Bray et al., 1975) and in the Northern Hemisphere by the Leeds, Volcano Ranch, and Yakutsk groups (Lapikens, 1979). The dependence of anisotropies in the arrival directions on primary energies, and the correlation between the anisotropies and the Galactic magnetic field are discussed. Results show that at 10 to the 17th eV to 10 to the 18th eV, an overlapped region of directions of first harmonics by the Chacaltaya and Leeds groups coincides with the North spur, while at 10 to the 18th eV to 10 to the 19th eV, two overlapped regions of directions of second harmonics by the Chacaltaya and Leeds groups coincide with the North spur and the Southern spur. As the primary energy increases from an order of 10 to the 18th eV to an order of 10 to the 19th eV, arrivals of cosmic rays disappear from the directions where the excesses of arrivals are observed at 10 to the 17th to 10 the 19th eV.
- Publication:
-
International Cosmic Ray Conference
- Pub Date:
- 1981
- Bibcode:
- 1981ICRC....2..164A
- Keywords:
-
- Cosmic Ray Showers;
- Incident Radiation;
- Southern Hemisphere;
- Anisotropic Media;
- Galactic Radiation;
- Interstellar Magnetic Fields;
- Northern Hemisphere;
- Space Radiation;
- COSMIC RAY SHOWERS;
- INCIDENT RADIATION;
- SOUTHERN HEMISPHERE;
- ANISOTROPIC MEDIA;
- GALACTIC RADIATION;
- INTERSTELLAR MAGNETIC FIELDS;
- NORTHERN HEMISPHERE