Correlation of the cosmic-ray intensity with solar-terrestrial parameters

Journal Article · Wed Jul 01 04:00:00 EDT 1981 · Geophys. Res. Lett.; (United States)

DOI:https://doi.org/10.1029/GL008i007p00837· OSTI ID:5427340

Jokipii, J R

Shea and Smart (1981) have shown that the correlation between the Mt Washington neutron monitor counting rate and the geomagnetic aa index changes significantly from the eleven-year period centered on one solar minimum to the next such period. They suggested that this may be a manifestation of cosmic-ray drift in the interplanetary magnetic field. This letter reports the results of numerical simulations of cosmic-ray modulation, including drift, which verify that drifts can indeed produce the sense of the observed effect. Perturbations in the heliospheric equatorial regions affect galactic cosmic rays observed near the equator more effectively if the northern hemisphere heliospheric magnetic field is inward than if it is outward. Perturbations in K/sub perpendicular/ are substantially more effective than perturbations in the solar wind velocity or in K/sub parallel/.

• Research Organization: Departments of Planetary Sciences and Astronomy, University of Arizona, Tucson, Az. 85721
• OSTI ID: 5427340
• Journal Information: Geophys. Res. Lett.; (United States), Journal Name: Geophys. Res. Lett.; (United States) Vol. 8:7; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

640101* -- Astrophysics & Cosmology-- Cosmic Radiation
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORRELATIONS
COSMIC RADIATION
COSMIC RAY PROPAGATION
GEOGRAPHICAL VARIATIONS
INTERPLANETARY MAGNETIC FIELDS
IONIZING RADIATIONS
LATITUDE EFFECT
MAGNETIC FIELDS
NUMERICAL SOLUTION
RADIATIONS
SOLAR CYCLE
VARIATIONS