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Birth of a comet magnetosphere: A spring of water ions
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2015 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 347, no 6220, UNSP aaa0571Article in journal (Refereed) Published
Abstract [en]

The Rosetta mission shall accompany comet 67P/Churyumov-Gerasimenko from a 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 (similar to 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.

Place, publisher, year, edition, pages
2015. Vol. 347, no 6220, UNSP aaa0571
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Physical Sciences
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URN: urn:nbn:se:uu:diva-247153DOI: 10.1126/science.aaa0571ISI: 000348225800033OAI: oai:DiVA.org:uu-247153DiVA: diva2:795942
Available from: 2015-03-17 Created: 2015-03-13 Last updated: 2017-12-04Bibliographically approved

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Eriksson, AndersEdberg, Niklas

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