Physics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....5..274t&link_type=abstract
In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5 p 274-277 (SEE N85-34991 23-93)
Physics
Cosmic Rays, Energy Spectra, Hadrons, Neutron Counters, Periodic Variations, Frequency Modulation, Sea Level, Statistical Analysis
Scientific paper
Modulation of cosmic-ray energy spectrum was studied by using the Turku double neutron monitor. The multiplicity region of detected neutrons produced by cosmic ray hadrons in the monitor was divided into seven categories corresponding to mean energies 0.1, 0.3, 1.0, 3.2, 8.6, 21, and 94 GeV of hadrons at sea level. Based on 24-hour frequencies, a statistical analysis showed that modulation of the intensity in all categories occurred during several periods in the fall 1984. The magnitude of the variation was a few per cent.
Arvela H.
Lumme M.
Nieminen M.
Peltonen Juhani
Torsti Jarmo
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