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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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 are substantially more effective than perturbations in the solar wind velocity or in K.

Original languageEnglish (US)
Pages (from-to)837-839
Number of pages3
JournalGeophysical Research Letters
Volume8
Issue number7
DOIs
StatePublished - 1981
Externally publishedYes

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perturbation
magnetic field
solar wind velocity
equatorial regions
interplanetary magnetic fields
Northern Hemisphere
equators
cosmic ray
monitors
solar wind
counting
wind velocity
modulation
neutrons
magnetic fields
simulation
parameter
index
rate
effect

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Correlation of the cosmic‐ray intensity with solar‐terrestrial parameters. / Jokipii, J. Randy.

In: Geophysical Research Letters, Vol. 8, No. 7, 1981, p. 837-839.

Research output: Contribution to journalArticle

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