The Sidereal Anisotropy of Cosmic Rays around 3. 10**15 EV Observed at Middle North Latitude
Abstract
The sidereal time variation of cosmic rays (median primary energy : 3 10 to the 15th power eV) is investigated with air shower observations at Akeno, Japan (900 m a.s.l.) which started in September 1981. Air showers are detected by a coincidence requirement on several muon detectors. The result obtained for three years is suggestive of a big semi-diurnal variation (0.37 % in amplitude). On the other hand, the diurnal variation is rather small than the semi-diurnal one. The feature of the sidereal anisotropy supposed from the present result looks quite different from that below 10 to the 14th power eV.
- Publication:
-
19th International Cosmic Ray Conference (ICRC19), Volume 2
- Pub Date:
- August 1985
- Bibcode:
- 1985ICRC....2..250M
- Keywords:
-
- Anisotropy;
- Cosmic Ray Showers;
- Detectors;
- Muons;
- Sidereal Time;
- Background Radiation;
- Diurnal Variations;
- Vectors (Mathematics);
- Space Radiation