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Correlation Between the Cosmic-ray Solar Daily Variation Underground and Geomagnetic Activity

  • A. G. Fenton (a1)

Extract

Since 1957, the University of Tasmania has operated cosmic-ray meson telescopes at an underground site near Hobart for the purpose of monitoring the intensity variations in the high energy component of the primary flux near the Earth. Details relating to the site, equipment, and meteorological influences on the observed intensity have been given previously. At a depth equivalent to 36m of water (36 m.w.e.), the equipment responds to an effective primary spectrum having a mean particle energy in the vicinity of 200 GeV and falling off rapidly at low energies, so that about 90% of the primaries have energy exceeding 50 GeV. The corresponding mean energy of response for surface muon telescopes at Hobart is about 25 GeV, while a neutron monitor at Hobart has a mean response at about 7 GeV.

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1 Fenton, A. G., Jacklyn, R. M. and Taylor, R. B., Il Nuovo Cimento, 22, 285 (1961).
2 Fenton, A. G., Proc. Int. Conf. on Cosmic Rays, Jaipur, India, 2, 185 (1963).
3 Parker, E. N., Planet. Space Sci., 12, 735 (1964).
4 Axford, W. I., Planet. Space Sci., 13, 115 (1965).
5 Ness, N. F., Scearce, C. S. and Seek, J. B., J. Geophys. Res., 69, 17, 3531 (1964).
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7 Snyder, C. W., Neugebauer, M. and Rao, U. R., J. Geophys. Res., 68, 6361 (1963).
8 Jacklyn, R. M. and Humble, J. E., Aust. J. Phys., 18, 451 (1965).
9 Peacock, D. S. and Thambyahpillai, T., Nature, 215, 146 (1967).

Correlation Between the Cosmic-ray Solar Daily Variation Underground and Geomagnetic Activity

  • A. G. Fenton (a1)

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