Abstract
High-speed solar-wind streams coming from coronal holes produce, in the interplanetary space, a quasi-stationary modulation of galactic cosmic rays. The Rome cosmic-ray group has analysed this modulation taking into account not only the charged-particle isotropic intensity but also the North-South anisotropy (A NS), derived from ground-based measurements. The obtained results for the period October 1964–December 1987 are summarized. Data from the Bartels solar rotation no. 2034 (May 23–June 18, 1982) are used to illustrate theA NS phenomenology.
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