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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 2
Ann. Geophys., 25, 543-555, 2007
https://doi.org/10.5194/angeo-25-543-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 543-555, 2007
https://doi.org/10.5194/angeo-25-543-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 Mar 2007

08 Mar 2007

Polar and Cluster observations of a dayside inverted-V during conjunction

J. D. Menietti1, R. A. Frahm2, A. Korth3, F. S. Mozer4, and Y. Khotyaintsev5 J. D. Menietti et al.
  • 1University of Iowa, Department of Physics and Astronomy, Iowa City, IA, USA
  • 2Southwest Research Institute, 6220 Culebra Road, San Antonio, TX, USA
  • 3Max-Planck-Institut fur Sonnensystemforschung, Katlenburg-Lindau, Germany
  • 4Space Science Lab, University of California, Berlekey, CA, USA
  • 5Institutet fur rymdfysik (IRFU), Uppsala, Sweden

Abstract. We investigate particle and fields data during a conjunction of the Polar and Cluster spacecraft. This conjunction occurs near the dayside cusp boundary layer when a dayside inverted-V was observed in the particle data of both satellites. Electron, ion, electric field, and magnetic field data from each satellite confirm that the dayside inverted-V (DSIV) structure is present at the location of both satellites and the electric fields persist from the altitude of the Polar (lower) spacecraft to the altitude of the Cluster spacecraft. We observe accelerated, precipitating electrons and upward ions along the magnetic field. In addition, large amplitude electric fields perpendicular to the ambient magnetic field seen by Polar and by Cluster suggest significant parallel electric fields associated with these events. For similar DSIV events observed by the Polar spacecraft, plasma waves (identified as possible Alfvén waves) have been observed to propagate in both directions along the magnetic field line. Future conjunctions will be necessary to confirm that DSIVs are associated with reconnection sites.

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