Physics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987s%26t....73..252s&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 73, March 1987, p. 252-255.
Physics
Comet Tails, Halley'S Comet, Plasma Interactions, Solar Wind, Bow Waves, Magnetohydrodynamic Waves, Plasma Dynamics, Shock Wave Interaction, Comets, Halley, Solar Wind, Popular, Diagrams, Interactions, Photographs, Plasma, Dynamics, Spacecraft Observations, Giotto, Vega Missions, Comae, Radiation, Gases, Magnetic Properties, Charged Particles, Comet Tails, Theoretical Studies, Ice Mission, Giacobini-Zinner, Formation, Turbulence, Ions, Magnetic Fields, Bow Shock, Boundaries, Electromagnetic Properties, Plas
Scientific paper
A qualitative model is presented for the formation and phenomena of a cometary tail. A comet encounters outward moving solar magnetic field lines. Gas and dust from the comet expand outward for several million kilometers and encounter and are stripped into ions by the solar wind. The particles become entwined in the broken solar field lines and spiral away from the sun, beyond the comet, at velocities of 400-500 km/sec, forming a plasma tail. Interplanetary magnetic field perturbations which result were, e.g., detected by the ICE spacecraft 28 million km from Comet Halley. Interactions among the comet bow shock, the solar wind, the IMF lines, and the outward flowing cometary material produce turbulence such as that observed in the tail of Comet Giacobini-Zinner.
Galeev A. A.
Sagdeev Roal'd. Z.
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