Deceleration of interstellar hydrogen at heliopause crossing suggested by Lyman-alpha spectral observations

Details Deceleration of interstellar hydrogen at heliopause crossing suggested by Lyman-alpha spectral observations Deceleration of interstellar hydrogen at heliopause crossing suggested by Lyman-alpha spectral observations

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231l...3l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 1, May 1990, p. L3-L6. Research supported by CNES.

Astronomy and Astrophysics

Astrophysics

18

Hydrogen Atoms, Interstellar Matter, Lyman Alpha Radiation, Lyman Spectra, Solar Magnetic Field, Interplanetary Medium, Line Spectra, Neutral Gases, Solar Cycles, Stagnation Point

Scientific paper

It is shown here that, due to ionization by the sun, H atoms which are observed in the so-called 'upwind' direction come from the 'nose' of the heliopause, while those observed in the opposite direction come from the sides of the heliospheric boundary. This very simple 'umbrella' effect of the sun is independent of the size of the heliosphere. If there are perturbations of neutrals which are different at theta = 0 deg and theta greater than 0 deg, they will be imprinted on the spectral shape of interplanetary Lyman-alpha, whatever the solar distance to the heliopause. These results show that strong constraints on the nature and effects of the heliospheric surface are implied by the line shape measurements of interplanetary Lyman-alpha. The Prognoz-Lyman-alpha spectral measurements are reinterpreted, and it is shown that the data are consistent with a bulk velocity increase of the inflowing neutrals when moving out from the stagnation line.

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