High-Speed Solar-Wind Streams from Coronal Holes and Modulation of Cosmic Ray Diurnal Anisotropy

Details High-Speed Solar-Wind Streams from Coronal Holes and Modulation of Cosmic Ray Diurnal Anisotropy High-Speed Solar-Wind Streams from Coronal Holes and Modulation of Cosmic Ray Diurnal Anisotropy

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3925m&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

1

Scientific paper

We analyze the solar modulation of cosmic ray diurnal anisotropy for the year 1974, an epoch with considerable high-sp eed solar-wind streams (HSSs) activity, which show pronounced 27-day recurrence. Coincidentally, enhanced diurnal wave trains of cosmic ray intensity also persist with a 27-day recurrence. On close insp ection of both data of neutron monitor (NM) and muon telescope (MU), we remark that the modulation of the diurnal anisotropy by the HSS may occur through two different processes; one is that many already reported that with the development of the HSS the diurnal waves are enhanced, and are observed by both NM and MU, and the other is our finding that along with the decline in the HSS the diurnal waves are again enhanced, and are rather observed by NM.

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