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

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journal contribution
posted on 09.01.2017, 16:26 by G. Provan, S. E. Milan, M. Lester, T. K. Yeoman, H. Khan
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.


CUTLASS is supported by the Particle Physics and Astronomy Research Council (PPARC grant PPA/R/R/1997/00256), UK, the Swedish Institute for Space Physics, Uppsala, and the Finnish Meteorological Institute, Helsinki. GP, SEM and HK are supported by PPARC grant PPA/G/O/1999/00181. The authors wish to thank P. T. Newell for providing DMSP data. We are grateful to Ron Lepping and Keith Ogilvie, principal investigators on the WIND spacecraft MFI and SWE instruments respectively.



Annales Geophysicae, 2002, 20 (2), pp. 281-287 (7)

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/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy


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Annales Geophysicae


European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany)





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