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Research by the Tasmanian cosmic ray group during the International Geophysical Year

journal contribution
posted on 2023-05-17, 00:34 authored by McCracken, KG, John Humble, Marcus DuldigMarcus Duldig
Systematic recording of the cosmic radiation commenced in Hobart in 1946 and at Mawson in Antarctica in 1955, making these two of the longest running cosmic ray observatories in the world. For the IGY, observations were also made at a sub-Antarctic island and near the equator, and an airborne survey of the nucleonic component was made from Geomagnetic Latitude −60°, south of Australia, to Japan and back. At Hobart there were neutron monitors, vertical and inclined muon telescopes, an ionization chamber, and two muon telescopes at 40 m of water equivalent underground. The research based on these and other observations determined the energy dependence of the Forbush and 11-year variations and concentrated, in particular, on understanding the anisotropic nature of galactic cosmic rays up to 150 GeV; the anisotropies in the onset phase of Forbush decreases; and the anisotropies in solar cosmic ray events. An investigation was initiated to calculate the trajectories and cutoff rigidities of cosmic rays in a high order simulation of the geomagnetic field. This was completed in 1959–60.

History

Publication title

Advances in Space Research

Volume

44

Issue

10

Pagination

1144-1154

ISSN

0273-1177

Department/School

School of Natural Sciences

Publisher

Elsevier Science Ltd

Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England

Rights statement

The definitive version is available at http://www.sciencedirect.com

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

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