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


McCracken, KG and Humble, JE and Duldig, ML, Research by the Tasmanian cosmic ray group during the International Geophysical Year, Advances in Space Research, 44, (10) pp. 1144-1154. ISSN 0273-1177 (2009) [Refereed Article]

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DOI: doi:10.1016/j.asr.2009.02.020


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 195960.

Item Details

Item Type:Refereed Article
Keywords:cosmic rays, Internationa geophysical year, neutron monitor, meson telescope, muon telescope, asymptotic directions
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:High energy astrophysics and galactic cosmic rays
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Humble, JE (Dr John Humble)
UTAS Author:Duldig, ML (Dr Marc Duldig)
ID Code:58891
Year Published:2009
Deposited By:Physics
Deposited On:2009-11-04
Last Modified:2011-09-29

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