Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.1101a&link_type=abstract
American Astronomical Society Meeting 208, #11.01; Bulletin of the American Astronomical Society, Vol. 38, p.90
Astronomy and Astrophysics
Astronomy
Scientific paper
The intensity of galactic cosmic rays in the inner heliosphere is modulated by the cosmic ray's interaction with the solar magnetic field and solar wind, with lower levels of modulation generally occurring during solar minimum. During solar minimum, the intensity of cosmic rays is often observed to be periodic with a period that matches the solar rotation period, indicating that the periodicity is produced by enhanced modulation in corotating interaction regions that occur at the interface between the slow and fast solar wind. I present an analysis of low energy cosmic ray observations obtained with MARIE (an instrument aboard Mars Odyssey) for three extended time periods in 2003 during which there were no solar particle events. Comparison of these data with data from SIS aboard ACE show that are short term modulation features (timescales of days) that persist over timescales of 1 solar rotation, indicating that structures in the heliosphere are producing short term modulation effects at times far from solar minimum.
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