Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1073s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, July 1990, p. 1073-1075.
Physics
35
Ion Temperature, Polar Regions, Solar Cosmic Rays, Solar Flares, Solar Neutrons, Solar Protons, Earth Atmosphere, Earth Surface, Radiation Counters, Relativistic Particles
Scientific paper
Ground-level solar cosmic-ray events are usually observed by high-latitude neutron monitors at relatively low rigidities (greater than 1 GV) and are not usually observed by underground cosmic-ray detectors because of their much higher threshold rigidity. However, the September 29, 1989 ground-level event was sufficiently large and unusual that it was recorded by the Embudo, NM underground muon telescope which has a threshold rigidity of 19 GV. The observed increase was 2.2 + or - 0.2 percent from 1100 to 1200 UT. There was no statistically significant increase in the data from the Socorro underground muon telescope which has a threshold rigidity of 45 GV. This is the first detection of a ground-level solar cosmic ray event by any underground cosmic-ray muon telescope where the event has been clearly distinguishable above the background cosmic-ray intensity.
Shea Margaret Ann
Swinson Derek B.
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