The attenuation coefficient for Oulu neutron monitor

Details The attenuation coefficient for Oulu neutron monitor The attenuation coefficient for Oulu neutron monitor

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3852m&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The attenuation coefficient (α) for the Oulu neutron monitor data was investigated during all the different phases of the solar cycle n. 22 to establish the nong-term time variability of the α-coefficient. The yearly data sets were divided into quarterly subsets, and using some auxiliary cosmic ray stations we derived an estimation of the annual α values. We show that the value α = 0.74 %/hPa, used for the ordinary data correction, is reliable only for low solar activity years. Whereas, during the maximum phase of the solar activity cycle the attenuation coefficient should be smaller than the used one (α = 0.72 %/hPa). Moreover, we found the imprint of the Gnevyshev gap effects on the cosmic radiation clearly discernible in the α-error.

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