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| Titel |
Polar lacuna on ionograms. E- or F-region processes? |
| VerfasserIn |
P. Stauning |
| 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 ; 13, no. 4 ; Nr. 13, no. 4, S.450-453 |
| Datensatznummer |
250011825
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| Publikation (Nr.) |
 copernicus.org/angeo-13-450-1995.pdf |
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| Zusammenfassung |
| Lacuna on ionograms indicate conditions where
the usual ionospheric reflections of vertically propagating radio waves
transmitted from and subsequently received by an ionosonde are missing over a
range of frequencies. Reflections from the lowermost E-region should still be
observable contrary to the more usual cases where absorption processes in the
underlying D-region removes the low-frequency part of the ionospheric
reflections appearing in ionograms. It is emphasized below that lacuna cases
related to E-region processes should be distinguished from lacunae related to
processes in the F1 and F2 regions. This distinction appears to have been
neglected in a recent paper. |
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