Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4189b&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
The solar neutron telescope (SONTEL) at Gornergrat, Switzerland, has been in operation since 1998 as the Europ ean cornerstone of a worldwide network for the study of high-energy neutrons produced in energetic processes at the Sun. During the GLE on April 15, 2001, the proportional counters of SONTEL showed a large count rate increase that started several hours before the GLE onset and that had a much longer duration compared to the GLE response as recorded by the other detector channels. Simultaneously, an increased level of environmental radioactivity was measured in the detector housing. Since April 2001 further events of enhanced environmental radioactivity have been observed which were not associated with a GLE. For the investigation of these enigmatic increases we additionally made measurements of the radon concentration in the detector housing. In this paper we compare the different measurements and discuss possible causes for the unusual increases in the count rates of the SONTEL proportional counters.
Bütikofer Rolf
Desorgher Laurent
Fluckiger Erwin O.
Matsubara Yoshimi
Moser Michael R.
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