Physics – Plasma Physics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9911547c&link_type=abstract
Journal of Geophysical Research, Volume 99, Issue A6, p. 11547-11552
Physics
Plasma Physics
36
Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Interstellar Gas, Space Plasma Physics: Charged Particle Motion And Acceleration
Scientific paper
We use observations of the intensity of anomalous cosmic ray helium and oxygen in the outer heliosphere near the last solar minimum period, in conjunction with solar observations of the tilt of the neutral current sheet, to estimate that the solar wind termination shock was at 67+/-5 AU during the time period 1986.7-1988.5. We find the source flux of anomalous cosmic rays at the shock to be 1.7+/-0.3 (m2 ssr MeV/nucleon)-1 for 7.1-17.1 MeV/nucleon anomalous cosmic ray oxygen and 4.3+/-0.8 (m2 ssr MeV/nucleon)-1 for 31-57 MeV/nucleon anomalous cosmic ray helium. We also estimate a source flux of anomalous cosmic ray hydrogen of 2.3+/-0.6 (m2 ssr MeV)-1 at 134 MeV. The resulting energy density of anomalous cosmic rays at the solar wind termination shock is ~0.03 eV/cm3, approximately 2% of the energy density of the solar wind at 67 AU.
Cummings Alan C.
Stone Edward C.
Webber William R.
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