Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121...10w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 1, May 1983, p. 10-14.
Astronomy and Astrophysics
Astrophysics
18
Comet Heads, Comet Nuclei, Cosmic Dust, Electric Charge, Electrodynamics, Halley'S Comet, Cometary Atmospheres, Electric Potential, Electromagnetic Shielding, Giotto Mission, Secondary Emission, Solar Wind Velocity, Spacecraft Shielding, Vega Project, Comets, Comae, Electromagnetic Effects, Dust, Solar Wind, Grains, Size, Composition, Plasmas, Radiation, Pressure, Accelerations, Charged Particles, Giotto Mission, Vega Mission, Electrodynamics
Scientific paper
Electromagnetic forces derived from the solar wind fields act strongly on submicron dust grains in the cometary coma. The grain charge and thus the forces are sensitive to composition and cometary plasma conditions, as well as to grain size. For dielectric grains of 0.1 μm and conducting grains of 0.3 μm or less, the electromagnetic forces dominate over radiation pressure. The stronger accelerations may produce fan-like structures as sometimes observed. They would also cause grains to circumvent the shields designed to protect the Giotto and Vega spacecrafts speeding through comet Halley's dust coma.
Hassan Mohammed H. A.
Wallis Max K.
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