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| Titel |
Letter to the Editor Simultaneous observations of the ionospheric footprint of flux transfer events and dispersed ion signatures |
| VerfasserIn |
G. Provan, S. E. Milan, Mark Lester, T. K. Yeoman, H. Khan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 20, no. 2 ; Nr. 20, no. 2, S.281-287 |
| Datensatznummer |
250014363
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| Publikation (Nr.) |
 copernicus.org/angeo-20-281-2002.pdf |
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| Zusammenfassung |
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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