Physics – Geophysics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990rvgeo..28...97s&link_type=abstract
Reviews of Geophysics (ISSN 8755-1209), vol. 28, Feb. 1990, p. 97-115. Research supported by NASA.
Physics
Geophysics
116
Heliosphere, Interplanetary Magnetic Fields, Interstellar Magnetic Fields, Interstellar Matter, Solar Wind, Fluid Flow, Galactic Cosmic Rays, Lyman Spectra, Neutral Gases, Plasma Waves, Shock Waves, Solar Radio Emission
Scientific paper
A Pioneer or Voyager spacecraft will soon pass through one of the last major frontiers in the solar system - the heliospheric terminal shock. Some unknown, but perhaps small, distance beyond the terminal shock is the heliopause, marking the final boundary between solar-wind and Galactic plasmas and the final goal of these spacecraft. This occasion offers an opportunity to obtain a wealth of information on the properties of the Galaxy, the interstellar medium, and the large-scale interactions of that medium with stellar winds. Several tentative remote detections of the shock place it just beyond the present spacecraft locations. However, uncertainties in the physical processes and parameters that determine the location of the boundary lead to equal uncertainties in predicting which of the spacecraft will reach it first.
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