| Autor: |
Chihiro Kato, M. Koyama, J. E. Humble, Kazuoki Munakata, S. Yasue, Z. Fujii, H. Ueno, Satoru Mori, K. B. Fenton, A. G. Fenton, M. L. Duldig, S. Akahane |
| Rok vydání: |
1995 |
| Předmět: |
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| Zdroj: |
Journal of geomagnetism and geoelectricity. 47:1103-1106 |
| ISSN: |
0022-1392 |
| Popis: |
A new underground moon telescope system installed at a depth of 154 m.w.e. at Liapootah, central Tasmania, has been continuously monitoring cosmic ray intensity since December 1991. In two hemisphere observations, this telescope plays an important roll as a conjugate station to Matsushiro in Japan, which has been operating at a similar depth (220 m.w.e.) since April 1984. In this paper, we analyze data recorded at Liapootah during 33 months from January 1992 to October 1994, to test the north-south asymmetry in the sidereal diurnal variation caused by galactic anisotropy of high energy cosmic ray intensity. W e find average sidereal variation (0.041 ± 0.006%, 3.5 ± 0.6 hr) being observed by the vertical component telescope (median latitude of viewing λE = 36.2°S). Comparison with the sidereal diurnal variation (0.028 ± 0.006%, 2.6 ± 0.8 hr) observed by Matsushiro λE = 34.5°N) during the same period confirms the existence of a north-south asymmetry in which the amplitude of the variation increases as the median direction of viewing moves southward over the equator. This is the first positive result indicating the north-south sidereal asymmetry by two hemisphere observations. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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