Birth of a comet magnetosphere: A spring of water ions

Hans Nilsson; G. Stenberg Wieser; E. Behar; C. S. Wedlund; H. Gunell; M. Yamauchi; R. Lundin; S. Barabash; M. Wieser; C. Carr; Emanuele Cupido; James L. Burch; A. Fedorov; J.-A. Sauvaud; H. Koskinen; E. Kallio; J.-P. Lebreton; A. Eriksson; N. Edberg; Raymond Goldstein; Pierre Henri; Christoph Koenders; Pat Mokashi; Zoltán Nemeth; Ingo Richter; K. Szego; M. Volwerk; C. Vallat; M. Rubin

doi:10.1126/science.aaa0571

Birth of a comet magnetosphere: A spring of water ions

Hans Nilsson ¹ G. Stenberg Wieser ¹ E. Behar ¹ C. S. Wedlund H. Gunell ² M. Yamauchi ¹ R. Lundin ¹ S. Barabash ¹ M. Wieser ¹ C. Carr ³ Emanuele Cupido ³ James L. Burch ⁴ A. Fedorov ⁵ J.-A. Sauvaud ⁵ H. Koskinen ⁶ E. Kallio ⁷ J.-P. Lebreton ⁸ A. Eriksson N. Edberg ⁹ Raymond Goldstein ¹⁰ Pierre Henri ⁸ Christoph Koenders ¹¹ Pat Mokashi ¹⁰ Zoltán Nemeth ¹² Ingo Richter ¹¹ K. Szego ¹² M. Volwerk ¹³ C. Vallat ¹⁴ M. Rubin ¹⁵

1 IRF - Swedish Institute of Space Physics [Uppsala]

2 BIRA-IASB - Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique

3 Blackett Laboratory

4 Space Science Division [San Antonio]

5 IRAP - Institut de recherche en astrophysique et planétologie

6 FMI - Finnish Meteorological Institute

7 School of Electrical Engineering [Aalto]

8 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace

9 IRF - Swedish Institute of Space Physics [Kiruna]

10 SwRI - Southwest Research Institute [San Antonio]

11 Technische Universität Braunschweig [Braunschweig]

12 Wigner Research Center for Physics [Budapest]

13 OeAW - Austrian Academy of Sciences

14 European Space Astronomy Centre - Rosetta Science Ground Segment

15 Physikalisches Institut [Bern]

Abstract : 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.

Type de document :

Article dans une revue

Science, American Association for the Advancement of Science, 2015, 347 (6220), pp.UNSP aaa0571. 〈10.1126/science.aaa0571〉

Domaine :

Planète et Univers [physics]

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https://hal-insu.archives-ouvertes.fr/insu-01256291
Contributeur : Nathalie Pothier <>
Soumis le : jeudi 14 janvier 2016 - 15:48:56
Dernière modification le : jeudi 7 février 2019 - 17:06:55

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