Solar modulation of galactic cosmic-ray intensity as seen by neutron monitors during 1990–1999 – I. Rigidity Dependence and Correlations with Solar Activity Parameters |
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| Authors: | Caballero R Valdés-Galicia JF |
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| Institution: | (1) Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico D.F., 04510, Mexico |
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| Abstract: | We analyze the evolution of cosmic ray intensity detected by six neutron monitors located at high altitude from 1990 to 1999,
that includes most of solar cycle 22 and the start of cycle 23. This set of neutron monitors covers a wide range of geomagnetic
cutoff rigidities. We discuss the most significant characteristics of the cosmic ray modulation during the period as: the
extraordinary decreases produced by the events of the first half of 1991, the significant two step evolution of the recovery
phase of solar cycle 22 and the start of cycle 23. We also determine the rigidity dependence of the different phases of the
modulation cycle. Cosmic ray intensity correlations with several solar activity parameters as sunspots, microwave flux at
10.7 cm and solar flares and with the intensity of the interplanetary magnetic field are studied. |
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