The interstellar cosmic ray spectrum and energy density. Interplanetary cosmic ray gradients and a new estimate of the boundary of the heliosphere

Details The interstellar cosmic ray spectrum and energy density. Interplanetary cosmic ray gradients and a new estimate of the boundary of the heliosphere The interstellar cosmic ray spectrum and energy density. Interplanetary cosmic ray gradients and a new estimate of the boundary of the heliosphere

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...179..277w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 179, no. 1-2, June 1987, p. 277-284.

Astronomy and Astrophysics

Astrophysics

64

Galactic Cosmic Rays, Heliosphere, Interplanetary Space, Interstellar Radiation, Radiant Flux Density, Solar Terrestrial Interactions, Energy Spectra, Radiation Pressure, Solar Radiation, Solar Wind

Scientific paper

The author has used two new sets of cosmic ray measurements to estimate the distance to the heliospheric pressure balance boundary, defined here as the distance to the expected termination shock. These include: (1) measurements of the interplanetary radial cosmic ray gradient made using Voyager and Pioneer spacecraft, (2) measurements of the rigidity spectra of proton and helium nuclei using a magnetic spectrometer which can be related to the predicted spectra from supernova shock acceleration theories. These measurements lead to a self consistent picture for an average boundary distance ≡46 - 56 AU at sunspot minimum. This analysis also leads to an interstellar galactic cosmic ray energy density of ≡1.5 eV cm-3, compared with cosmic ray energy densities of 0.98 eV cm-3 at earth at sunspot minimum and 0.78 eV cm-3 at sunspot maximum. The local interstellar parameters that determine the location of the heliospheric boundary are not greatly different from those deduced by a variety of methods on a scale of a few hundred parsec.

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