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          Institute: MPI für extraterrestrische Physik     Collection: Space Plasma Physics     Display Documents

ID: 12956.0, MPI für extraterrestrische Physik / Space Plasma Physics
Motion of auroral ion outflow structures observed with CLUSTER and IMAGE FUV
Authors:Kistler, L. M.; Frey, H. U.; Möbius, E.; Mouikis, C.; Quinn, J. M.; Klecker, B.; Reme, H.; Bosqued, J. M.; Dandouras, I.; Sauvaud, J. A.; Di Lellis, A. M.; Formisano, V.; Marcucci, M. F.; Carlson, C. W.; McFadden, J. P.; Parks, G. K.; McCarthy, M.; Korth, A.; Eliasson, L.; Lundin, R.; Paschmann, G.; Popecki, M. A.; Mende, S. B.; Winningham, J. D.; Fazakerley, A. N.
Date of Publication (YYYY-MM-DD):2002-10
Title of Journal:Journal of Geophysical Research A
Journal Abbrev.:J. Geophys. Res. A
Issue / Number:A8
End Page:1186
Sequence Number of Article:1186
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:[1] During February 2001 the CLUSTER satellites recorded a number of perigee passes through the midnight auroral zone. We concentrate on one pass, on 23 February 2001, when structured outflow was observed. Simultaneous observations of the aurora were available from the FUV instrument on IMAGE. The features in the ion outflow observed by the Cluster Ion Spectrometry (CIS) experiment are compared with the auroral activity. Observations from the multiple CLUSTER spacecraft are used to determine the velocity of the outflow structures. We find a good correspondence between the observed ion outflow and the auroral arcs, with the highest energy outflow corresponding to the brightest arcs. The features at the equatorward edge, which are trapped precipitating ions, are stationary. In addition, the increased velocity structure at the poleward edge is also stationary. However, the bulk of the ion outflow structures, which are observed between these boundaries, are moving equatorward with a velocity of roughly 7 km/s, which corresponds to a velocity of 0.7 km/s at 100 km. One feature is observed moving poleward, at the same time that the auroral arc is expanding poleward. Comparisons with the motion of the auroral arcs and with the convection velocity measured by the EDI instrument on CLUSTER show that the motion of the structures in general agrees with the convective motion of the field lines.
Free Keywords:CLUSTER; aurora; ion; outflow
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Univ New Hampshire, Ctr Space Sci, 410 Morse Hall, Durham, NH; 03824 USA; Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA; Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA; Max Planck Inst Extraterr Phys, D-85740 Garching, Germany; Ctr Etud Spatiale Rayonnements, F-31029 Toulouse, France; Ist Fis Spazio Interplanetario, I-00133 Rome, Italy; Univ Washington, Geophys Program, Seattle, WA 98195 USA; Max Planck Inst Aeron, D-37191 Katlenburg Lindau, Germany; Swedish Inst Space Phys, S-98128 Kiruna, Sweden; SW Res Inst, Dept Space Sci, San Antonio, TX 78284 USA; Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
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