The seasonal variation of cosmic ray intensity at a depth of 60 m.w.e. underground in london

Details The seasonal variation of cosmic ray intensity at a depth of 60 m.w.e. underground in london The seasonal variation of cosmic ray intensity at a depth of 60 m.w.e. underground in london

Jan 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968jatp...30....1d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 30, no. 1, pp. 1-10

Physics

Scientific paper

An array of six vertical scintillation counter telescopes of semi-cubical geometry has been operating continuously at a depth of 60 m.w.e. underground during the period August 1963-July 1964. After correction for barometer changes the results show a seasonal variation of amplitude about 0.2 per cent with the maximum intensity in May. An additional correction for the muon decay effect enhances the amplitude to about 0.3 per cent and causes the maximum intensity to occur in June. A linear correction applied to allow for a possible solar cycle variation in the underground intensity modifies the results only slightly. Even though the corrected seasonal wave shows good positive correlation with the seasonal variation in the temperature of the atmospheric layer bounded by the 200 mb and 70 mb isobers, the interpretation of the seasonal wave in cosmic ray intensity in terms of Duperier's positive temperature effect encounters some difficulty because the temperature coefficient yielded by the seasonal analysis has a significantly higher value (by a factor of about 1.7) than that obtained from the day-by-day analysis. The possible origin of this discrepancy is discussed. The seasonal wave in cosmic ray intensity which is to be expected from the temperature data when Dorman's densities of temperature coefficients are utilized agrees fairly well with the observed seasonal wave and this indicates that the latter may be entirely of atmospheric origin. Rainfall and geomagnetic activity do not show any close relationship with the cosmic ray seasonal wave.

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