Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227..331w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, July 15, 1987, p. 331-339.
Astronomy and Astrophysics
Astronomy
3
Charged Particles, Cosmic Dust, Interstellar Matter, Solar System, Solar Terrestrial Interactions, Magnetic Dipoles, Magnetic Flux, Molecular Clouds, Solar Wind
Scientific paper
The electric and magnetic fields associated with the solar wind prevent interstellar submicron dust from reaching the neighborhood of the earth, primarily because the charged dust grains have large gyroradii and move down the electric field. During passage through an interstellar cloud, the degree of heliosphere contraction (solar wind restriction) depends on the helium gas component, as accelerated in the sun's gravitational field. For cloud densities exceeding 100/cu cm, the dust component reaches the earth with little depletion, at least on the upstream part of the earth's orbit. Formulas are developed for grain densities in the sun's gravitationally focused wake, as limited by the electromagnetic scattering. Since this is a sensitive function of grain size, space-borne detectors that discriminate sizes in the 1-10-micron region would test the theory and establish interstellar dust parameters.
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