The comet Halley diamagnetic cavity boundary

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Boundary Layer Transition, Cavities, Comet Nuclei, Diamagnetism, Electron-Ion Recombination, Halley'S Comet, Ions, Computerized Simulation, Giotto Mission, Magnetohydrodynamics, Magnetometers, Plasma Density

Scientific paper

The magnetometer onboard the Giotto spacecraft observed a diamagnetic cavity surrounding the nucleus of comet Halley. A narrow transition layer with enhanced plasma density is formed at this shock-like boundary as a flux of cometary ions flowing into it from within the cavity is removed by electron-ion recombination. We examine the structure of this layer using both a two-dimensional magnetohydrodynamical model and a one- dimensional hybrid code.

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