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| Titel |
A comparison of velocity measurements from the CUTLASS Finland radar and the EISCAT UHF system |
| VerfasserIn |
J. A. Davies, Mark Lester, S. E. Milan, 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. 7 ; Nr. 17, no. 7, S.892-902 |
| Datensatznummer |
250013785
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| Publikation (Nr.) |
 copernicus.org/angeo-17-892-1999.pdf |
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| Zusammenfassung |
The CUTLASS Finland radar, which comprises an
integral part of the SuperDARN system of HF coherent radars, provides near
continuous observations of high-latitude plasma irregularities within a
field-of-view which extends over some four million square kilometres. Within the
Finland radar field-of-view lie both the EISCAT mainland and EISCAT Svalbard
incoherent scatter radar facilities. Since the CUTLASS Finland radar commenced
operation, in February 1995, the mainland EISCAT UHF radar has been run in
common programme 1 and 2 modes for a total duration exceeding 1000 h.
Simultaneous and spatially coincident returns from these two radars over this
period provide the basis for a comparison of irregularity drift velocity and
F-region ion velocity. Initial comparison is limited to velocities from four
intervals of simultaneous radar returns; intervals are selected such that they
exhibit a variety of velocity signatures including that characteristic of the
convection reversal and a rapidly fluctuating velocity feature. Subsequent
comparison is on a statistical basis. The velocities measured by the two systems
demonstrate reasonable correspondence over the velocity regime encountered
during the simultaneous occurrence of coherent and incoherent scatter;
differences between the EISCAT UHF measurements of F-region ion drift and the
irregularity drift velocities from the Finland radar are explained in terms of a
number of contributing factors including contamination of the latter by E-region
echoes, a factor which is investigated further, and the potentially deleterious
effect of discrepant volume and time sampling intervals.
Key words. Ionosphere (ionospheric irregularities;
plasma convection) |
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