Computer Science
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..434c&link_type=abstract
Nature (ISSN 0028-0836), vol. 322, July 31, 1986, p. 434-436.
Computer Science
15
Compton Effect, Cosmic Rays, Earth Motion, Muons, Relativistic Effects, Solar Orbits, Diurnal Variations, Orbital Velocity, Particle Intensity
Scientific paper
The Compton-Getting effect is the intensification of the energy threshold of a cosmic ray detector when it is moved along its direction of maximum sensitivity relative to the rest frame of the cosmic ray plasma. An analytical model is defined for quantifying the enhancement which occurs. The model was applied to muon data from a cosmic ray anisotropy detector located in a Utah mine. The detector has three layers of 100 plastic scintillators with a sensitivity threshold at 128 GeV. Approximately 480 million muons were recorded from 1978-83, and exhibited a fractional diurnal amplitude modulation of 0.00019-0.00032. The variation reached a maximum at about 0600 LT, in line with prediction of the model for a detector on the earth brought by the rotation of the planet to a position where its most sensitive direction is parallel to that of the earth's velocity. The presence of the effect is confirmed after accounting for the effects of meteorology, solar activity and the geomagnetic field.
Cutler D. J.
Groom Don E.
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