Step decreases observed at 1 AU and in the distant heliosphere: 1997 - 2002

Details Step decreases observed at 1 AU and in the distant heliosphere: 1997 - 2002 Step decreases observed at 1 AU and in the distant heliosphere: 1997 - 2002

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003adspr..32..627c&link_type=abstract

Advances in Space Research, Volume 32, Issue 4, p. 627-632.

Computer Science

4

Scientific paper

The period 1997 - 2002, spans the time from the solar minimum of cycle 22 through that of solar maximum for cycle 23. At 1 AU the intensity of 265 MeV/n galactic cosmic rays (GCR) He decreased by a factor of 5.06 +/- 0.07 over this period through a series of some 5 step decreases. At this time Voyagers 1 and 2 were moving between 50 and 84 AU. These modulation features are convected out to the distant heliosphere but the step size for GCR He and H is much smaller than that observed at 1 AU. At 80 AU the intensity of GCR He decreased by a factor of 1.28 +/- 0.02 from, solar minimum to solar maximum. For the lower rigidity cosmic rays the modulation features are similar to those at 1 AU except that the magnitude of the step decreases are much smaller. In this study we compare the 1 AU step decreases with those in the distant heliosphere as a function of particle rigidity. The solar activity that may be producing these decreases is also investigated.

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