Irregular structures of the F layer at high latitudes during ionospheric heating
Results on heating the ionospheric F region above Tromsø, Norway are presented. The ionosphere was monitored by satellite tomography and amplitude scintillation methods as well as the EISCAT incoherent scatter radar. No effect of heating was observed in the daytime. In the evening and in the pre...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2000-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/18/1197/2000/angeo-18-1197-2000.pdf |
| Summary: | Results on heating the ionospheric F region
above Tromsø, Norway are presented. The ionosphere was monitored by satellite
tomography and amplitude scintillation methods as well as the EISCAT incoherent
scatter radar. No effect of heating was observed in the daytime. In the evening
and in the pre-midnight sector, noticeable tilts of the F region were observed
during heating periods. The tilts overlapped the heating cone, where the
electron density decreased and irregularities exceeding 10 km in size appeared.
Between the heating periods the F layer was restored to its horizontal shape.
The anisotropic parameters of small-scale irregularities with scale lengths of
hundreds of metres were also determined. It was found that the perpendicular
anisotropy points in the direction of F region plasma flow. In some cases the
results can be explained by assuming that the small-scale irregularities were
generated within the heating cone and drifted out of the heating region where
they were subsequently observed.<br><br><b>Key words:</b> Ionosphere (active experiments; auroral
ionosphere; ionospheric irregularities) |
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| ISSN: | 0992-7689 1432-0576 |