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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 2
Ann. Geophys., 20, 281-287, 2002
https://doi.org/10.5194/angeo-20-281-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 281-287, 2002
https://doi.org/10.5194/angeo-20-281-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 Feb 2002

28 Feb 2002

Letter to the Editor
Simultaneous observations of the ionospheric footprint of flux transfer events and dispersed ion signatures

G. Provan, S. E. Milan, M. Lester, T. K. Yeoman, and H. Khan G. Provan et al.
  • Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
  • Correspondence to: G. Provan: gp3@ion.le.ac.uk)

Abstract. We perform a case study of a favourable conjunction of overpasses of the DMSP F11 and F13 spacecraft with the field of view of the Hankasalmi HF coherent scatter. At the time, pulsed ionospheric flows (PIFs) were clearly observed at a high-latitude in the radar field of view. The PIFs were associated with medium spectral width values and were identified as the fossilized signatures of pulsed dayside reconnection. Simultaneously, DMSP spectrograms from the two spacecraft showed dispersed ion signatures, observed equatorwards of the PIF signatures. We identified dayside high-latitude magnetosphere boundaries; these boundaries agreed well with those defined using the algorithm on the JHU/APL auroral particle website (Haerendel et al., 1978; Newell and Meng, 1988, 1995; Newell et al., 1991a, 1991b, 1991c; Traver et al., 1991). We conclude that in this case study the dispersed ion signatures map to regions of very newly-opened flux. It is only when this flux has convected polewards that the signatures of the PIFs with medium spectral widths are observed by the HF radars. These particular PIF signatures map to regions of mantle precipitation, i.e. recently reconnected flux.

Key words. Ionosphere (ionosphere-magnetosphere interaction) – Magnetospheric physics (magnetopause, cusp and boundary layers; plasma convection)

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