Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..173g&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 6, p. 173-178.
Astronomy and Astrophysics
Astrophysics
2
Emission Spectra, Hydrogen Atoms, Interstellar Matter, Lyman Alpha Radiation, Shock Discontinuity, Solar Wind, Backscattering, Cosmic Plasma, Neutral Gases
Scientific paper
The location of the termination shock is a problem of great interest in astrophysics and the current availability of deep space probes with UV detectors has made it possible in principle to remotely sense the termination shock. The method depends upon a measurement of the neutral hydrogen distribution which results from the presence of the heliospheric plasma structure. The charge exchange interaction between the inflowing neutral hydrogen and the plasma structure leads to an observable modification of the inflowing hydrogen distribution. Hence, both the radial dependence of the backscattered Lyman-alpha glow and the absolute difference in the upstream and downstream glow brightness are modified. Recent Voyager 1 and 2 and Pioneer 10 spacecraft data are consistent with the presence of a termination shock. The observational evidence and theoretical models from which a termination shock is inferred will be presented.
Gangopadhyay Pradip
Judge Darrell L.
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