Evidence of a nearby solar wind shock as obtained from distant Pioneer 10 ultraviolet glow data

Astronomy and Astrophysics – Astrophysics

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Plasma Interactions, Shock Waves, Solar Activity Effects, Solar Wind, Interstellar Magnetic Fields, Interstellar Matter, Pioneer 10 Space Probe, Stellar Models, Ultraviolet Photometry

Scientific paper

Pioneer 10 UV photometric data are used to study the nature of the heliospheric boundary interactions between solar wind and inflowing partially ionized interstellar wind and the interstellar magnetic field. The radial intensity dependence of solar Ly-alpha photons backscattered by inflowing interstellar hydrogen atoms is observed. The data in the downstream direction at distances greater than about 37 AU show a distortion of the incoming hydrogen atom density profile. It is suggested that this is characteristic of a nearby solar wind shock probably located about 50 AU from the sun in January 1987.

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