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| Titel |
Multi-instrument probing of the polar ionosphere under steady northward IMF |
| VerfasserIn |
S. E. Pryse, A. M. Smith, L. Kersley, I. K. Walker, C. N. Mitchell, J. Moen, R. W. Smith |
| 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 ; 18, no. 1 ; Nr. 18, no. 1, S.90-98 |
| Datensatznummer |
250013885
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| Publikation (Nr.) |
 copernicus.org/angeo-18-90-2000.pdf |
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| Zusammenfassung |
Observations are presented of the polar
ionosphere under steady, northward IMF. The measurements, made by six
complementary experimental techniques, including radio tomography, all-sky and
meridian scanning photometer optical imaging, incoherent and coherent scatter
radars and satellite particle detection, reveal plasma parameters consistent
with ionospheric signatures of lobe reconnection. The optical green-line
footprint of the reconnection site is seen to lie in the sunward plasma
convection of the lobe cells. Downstream in the region of softer precipitation
the reverse energy dispersion of the incoming ions can be identified. A steep
latitudinal density gradient at the equatorward edge of the precipitation
identifies the general location of an adiaroic boundary, separating the open
field lines of polar lobe cells from the closed field of viscous-driven cells.
Enhancements in plasma density to the south of the gradient are interpreted as
ionisation being reconfigured as it is thrust against the boundary by the
antisunward flow of the viscous cells near noon. Each of the instruments
individually provides valuable information on certain aspects of the ionosphere,
but the paper demonstrates that taken together the different experiments
complement each other to give a consistent and comprehensive picture of the
dayside polar ionosphere..
Key words. Ionosphere (polar ionosphere) ·
Magnetospheric physics (magnetosphere-ionosphere interactions; polar cap
phenomena) |
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