Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...563l.179r&link_type=abstract
The Astrophysical Journal, Volume 563, Issue 2, pp. L179-L182.
Astronomy and Astrophysics
Astronomy
9
Ism: Cosmic Rays, Interplanetary Medium, Sun: Solar Wind, Sun: Magnetic Fields
Scientific paper
We report on the 27 day oscillations in the intensities of He and O ions of the anomalous cosmic rays (ACRs) observed near Earth by the Wind spacecraft during the 1995-1997 solar minimum period. Oscillations persist throughout the period with amplitudes as large as 50%. Galactic cosmic ray (GCR) oscillations, observed by neutron monitors, are in phase with the ACRs, but with much smaller amplitude (2%-3%). For a sustained period of almost a year, peak intensities occur near north-to-south crossings of the heliospheric current sheet and valleys near south-to-north crossings. In GCR observations in the 1974-1976 solar minimum, 27 day oscillations with a similar phase are seen. Understanding these observations poses a severe challenge for models of solar modulation as well as for models of the solar and heliospheric magnetic fields.
Ng Chee K.
Reames Donald. V.
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