Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.585 IF 1.585
  • IF 5-year value: 1.698 IF 5-year
    1.698
  • CiteScore value: 1.62 CiteScore
    1.62
  • SNIP value: 0.820 SNIP 0.820
  • IPP value: 1.52 IPP 1.52
  • SJR value: 0.781 SJR 0.781
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 83 Scimago H
    index 83
  • h5-index value: 24 h5-index 24
Volume 23, issue 5
Ann. Geophys., 23, 1909–1916, 2005
https://doi.org/10.5194/angeo-23-1909-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 1909–1916, 2005
https://doi.org/10.5194/angeo-23-1909-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 Jul 2005

28 Jul 2005

Statistics of high-altitude and high-latitude O+ ion outflows observed by Cluster/CIS

S. Arvelius1, M. Yamauchi1, H. Nilsson1, R. Lundin1, Y. Hobara1, H. Rème2, M.B. Bavassano-Cattaneo3, G. Paschmann4, A. Korth5, L. M. Kistler6, and G. K. Parks7 S. Arvelius et al.
  • 1Swedish Institute of Space Physics (IRF), Box 812, 98128 Kiruna, Sweden
  • 2Centre d’Etude Spatiale des Rayonnements, Toulouse, France
  • 3Instituto di Fisica dello Spazio Interplanetario, Roma, Italy
  • 4Max-Planck-Institut für Extraterrestrische Physik, Garching, Germany
  • 5Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
  • 6University of New Hampshire, Durham, USA
  • 7Space Science Laboratory, UC Berkeley, USA

Abstract. The persistent outflows of O+ ions observed by the Cluster CIS/CODIF instrument were studied statistically in the high-altitude (from 3 up to 11 RE) and high-latitude (from 70 to ~90 deg invariant latitude, ILAT) polar region. The principal results are: (1) Outflowing O+ ions with more than 1keV are observed above 10 RE geocentric distance and above 85deg ILAT location; (2) at 6-8 RE geocentric distance, the latitudinal distribution of O+ ion outflow is consistent with velocity filter dispersion from a source equatorward and below the spacecraft (e.g. the cusp/cleft); (3) however, at 8-12 RE geocentric distance the distribution of O+ outflows cannot be explained by velocity filter only. The results suggest that additional energization or acceleration processes for outflowing O+ ions occur at high altitudes and high latitudes in the dayside polar region.

Keywords. Magnetospheric physics (Magnetospheric configuration and dynamics, Solar wind-magnetosphere interactions)

Publications Copernicus
Download
Citation