A solar cycle variation in the barometer coefficients of high latitude neutron monitors

Physics

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Atmospheric Pressure, Cosmic Rays, Neutron Counters, Polar Regions, Solar Cycles, Solar Terrestrial Interactions, Barometers, Data Correlation, Ground Stations, Harmonic Analysis, Particle Intensity, Solar Activity Effects, Spherical Harmonics

Scientific paper

Results obtained by spherical harmonic analysis which is performed on the basis of the neutron monitor records from 20 stations at high latitudes, where the cutoff rigidities are below 2.3 GV, are used to reevaluate the barometer coefficients of neutron monitors. By using the same method for 12 years, from January 1966 to December 1977, the time variation of the barometer coefficient over one solar cycle, is investigated. The averages of yearly mean data of eight stations show that the absolute value of the barometer coefficient is in positive correlation with the cosmic ray intensity. The variation rate of the barometer coefficient to the neutron intensity is larger in the solar quiet period than in the solar active period. A list of the residual barometer coefficients is given.

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