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| Titel |
Letter to the editorCUTLASS observations of a high-m ULF wave and its consequences for the DOPE HF Doppler sounder |
| VerfasserIn |
D. M. Wright, T. K. Yeoman |
| 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 ; 17, no. 11 ; Nr. 17, no. 11, S.1493-1497 |
| Datensatznummer |
250013841
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| Publikation (Nr.) |
 copernicus.org/angeo-17-1493-1999.pdf |
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| Zusammenfassung |
The CUTLASS
(Co-operative UK Twin Located Auroral Sounding System)
Finland HF radar, whilst operating in a high spatial and
temporal resolution mode, has measured the ionospheric signature of a naturally
occurring ULF wave in scatter artificially generated by
the Tromsù Heater. The wave had a period of 100 s and
exhibited curved phase fronts across the heated volume
(about 180 km along a single radar beam). Spatial
information provided by CUTLASS has enabled an m-number
for the wave of about 38 to be determined. This high-m
wave was not detected by the IMAGE (International Monitor
for Auroral Geomagnetic Efects) network of ground magnetometers, as expected
for a wave of a small spatial scale size. These observations
over the first independent confirmation of the existence
of the ground uncorrelated ULF wave signatures previously
reported in measurements recorded from an HF Doppler sounder located in the
vicinity of Tromsö. These results both demonstrate a new
capability for geophysical exploration from the combined CUTLASS-EISCAT
ionospheric Heater experiment, and provide a verification of the HF Doppler
technique for the investigation of small scale ULF waves.
Key words.
Ionosphere (ionosphere – magnetosphere interactions)
. Magnetospheric
physics (magnetosphere – ionosphere
interactions; MHD waves and instabilities) |
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