Detection of the local interstellar cloud from high-resolution spectroscopy of nearby stars - Inferences on the heliospheric interface

Details Detection of the local interstellar cloud from high-resolution spectroscopy of nearby stars - Inferences on the heliospheric interface Detection of the local interstellar cloud from high-resolution spectroscopy of nearby stars - Inferences on the heliospheric interface

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815193b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A9, p. 15,193-15,197.

Physics

51

Heliosphere, Interstellar Matter, Magnetohydrodynamic Flow, Plasma Composition, Solar Wind, Flow Velocity, Helium, Plasma Clouds, Velocity Measurement

Scientific paper

High-resolution spectroscopic observations of the local interstellar medium between the sun and nearby stars have been recorded and used to identify and characterize the local interstellar cloud (LIC) in which the sun is embedded. The 'Doppler triangulation' shows that the local cloud flows toward lambda = 74.9 deg; beta = -7.8 deg at a velocity of 25.7 +/-1.0 km/s with respect to the sun. The recent detection of interstellar neutral helium inside the heliosphere, found to flow at 26.0 +/-1.0 km/s with the Ulysses Neutral Gas Experiment, brings a definitive proof of this identification. As a consequence of the LIC velocity determination, the interstellar neutral hydrogen found to flow at 20 km/s through the solar system is shown to be decelerated by 6 km/s and slightly heated up to 8000 K due to coupling with the plasma at the heliospheric interface.

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