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COMETARY SCIENCE Birth of a comet magnetosphere:

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Abstract

heliocentric distance of>3.6 astronomical units through perihelion passage at 1.25 astronomical units, spanning low and maximum activity levels. Initially, the solar wind permeates the thin comet atmosphere formed from sublimation, until the size and plasma pressure of the ionized atmosphere define its boundaries: A magnetosphere is born. Using the Rosetta Plasma Consortium ion composition analyzer, we trace the evolution from the first detection of water ions to when the atmosphere begins repelling the solar wind (~3.3 astronomical units), and we report the spatial structure of this early interaction. The near-comet water population comprises accelerated ions (<800 electron volts), produced upstream of Rosetta, and lower energy locally produced ions; we estimate the fluxes of both ion species and energetic neutral atoms. A n active comet emits gas and dust that ex-pand into the surrounding space and form the comet atmosphere or coma. Its neutral component—which is mainly composed o

Year: 2016
OAI identifier: oai:CiteSeerX.psu:10.1.1.944.5388
Provided by: CiteSeerX
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