Extensions to the Coupling Coefficient Calculations for Muon Telescopes

Abstract

The calculation of coupling coefficients for muon telescopes has previously used interpolation from a limited set of asymptotic directions of arrival of primary particles. Furthermore, these calculations have not incorporated curvature of the atmosphere and thus diverge from the true response at zenith angles greater than about 75 degrees. The necessary extensions to calculate coupling coefficients at arbitrary zenith angles are given, including an improved method of incorporating the asymptotic directions of the primary particles. It is shown, using this method, that certain coupling coefficients are highly sensitive to small changes in asymptotic directions for some telescope configurations.

Enhanced Cosmic Ray Diurnal Variations in Mawson and Hobart Neutron Monitor and Underground Data Records

“…It will be necessary to reduce these data further to obtain the free space amplitudes outside the geomagnetic field. Using the coupling coefficients of Yasue et al (1982) for the neutron monitors and those of Baker et al (1989) and Fujimoto et al (1984) for the underground detectors and following the technique of Jacklyn and Humble (1965) it should be possible to derive the rigidity dependent, upper limiting rigidity and free space parameters of the anisotropy for each of the periods described. Where the data exist, it should also be possible to compare these parameters with the inter-planetary magnetic field and solar wind and plasma data.…”

“…The present work is an extension ; of a preliminary analysis of such enhancements in muon data from the Mawson underground north and Hobart vertical telescopes and data from the Mawson and Mt. Wellington neutron monitors (Humble et al 1989) for the period 1982-1988. i…”