Voyager measurements of galactic cosmic rays and implications for modulation in the heliosheath and beyond

Details Voyager measurements of galactic cosmic rays and implications for modulation in the heliosheath and beyond Voyager measurements of galactic cosmic rays and implications for modulation in the heliosheath and beyond

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..858..135w&link_type=abstract

PHYSICS OF THE INNER HELIOSHEATH: Voyager Observations, Theory, and Future Prospects; 5th Annual IGPP International Astrophysics

Astronomy and Astrophysics

Astrophysics

2

Heliopause And Solar Wind Termination, Interplanetary Propagation And Effects, Heliosphere/Interstellar Medium Interactions, Solar Cycle Variations

Scientific paper

One year has passed since V1 crossed the heliospheric termination shock at a distance ~94 AU. During this time the intensities of galactic protons and electrons at V1 have increased at an unprecedented rate; >70 MeV particles have increased by nearly 40%, 175 MeV protons have more than doubled and 10 MeV electrons have increased by a factor ~4. If these increases seen at V1 continue for another 2 years during the expected recovery phase of this interstellar 11-year modulation cycle, then the intensities at V1 will be near recent estimates of the IS proton spectrum based on direct spectral measurements above several GeV where the modulation is small, and simple Leaky Box galactic propagation models. At this time V1 will be 108 AU from the Sun and solar activity will be nearing its minimum in the 11-year cycle. Intensity increases in these components are also observed at V2, but are generally smaller. In 2008 V2 will be at ~87 AU and possibly near the heliospheric termination shock itself. The intensity differences between V1 and V2 now and in the ensuing 2-3 years will thus be a measure of the heliosheath modulation of galactic cosmic rays near a time of minimum modulation.

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