Physics – Plasma Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10912106b&link_type=abstract
Journal of Geophysical Research, Volume 109, Issue A12, CiteID A12106
Physics
Plasma Physics
6
Interplanetary Physics: Cosmic Rays, Ionosphere: Solar Radiation And Cosmic Ray Effects, Marine Geology And Geophysics: Geomagnetism (1550), Space Plasma Physics: Charged Particle Motion And Acceleration, Atmospheric Composition And Structure: Pressure, Density, And Temperature
Scientific paper
We have recently augmented the electronics for our neutron monitor (NM) latitude survey so as to record the elapsed time (δT) between detected neutrons in each proportional tube, in order to examine time correlations in the data as a function of cutoff rigidity and primary spectrum. We quantify the dependence of counting rate on dead time, with particular focus on the longer dead times that were once employed in FSU/Russian stations. Our observations show that monitor dead time has little influence on the observed depth of Forbush decreases, indicating that the cosmic ray spectral shape is little changed in the decrease. However, the use of a different dead time significantly alters the response of the monitor as a function of cutoff rigidity. In spite of the general success of our calculation in reproducing the data, unexplained discrepancies are still present.
Bieber John W.
Clem John Mason
Duldig Marc L.
Evenson Paul A.
Humble John E.
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