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Two Hemisphere Observations of the North-South Sidereal Assymetry at ~1TeV
journal contribution
posted on 2023-05-16, 09:52 authored by Munakata, K, Yasue, S, Mori, S, Kato, C, Koyama, M, Akahane, S, Fujii, Z, Ueno, H, John Humble, Fenton, AG, Fenton, KB, Marcus DuldigMarcus DuldigA 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. We find average sidereal variation (0.041 ± 0.006%, 3.5 ± 0.6 hr) being observed by the vertical component telescope (median latitude of viewing λ e = 36.2°S). Comparison with the sidereal diurnal variation (0.028 ± 0.006%, 2.6 ± 0.8 hr) observed by Matsushiro λ e = 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. © 1995, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.
History
Publication title
Journal of Geomagnetism and GeoelectricityVolume
47Issue
11Pagination
1103-1106ISSN
0022-1392Department/School
School of Natural SciencesPublisher
Terra Scientific Publishing CompanyPlace of publication
Tokyo, JapanRepository Status
- Restricted