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| Titel |
New techniques for auroral irregularity studies with COSCAT |
| VerfasserIn |
P. Eglitis, I. W. McCrea, T. R. Robinson, T. Nygrén, K. Schlegel, T. Turunen, T. B. Jones |
| 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 ; 16, no. 10 ; Nr. 16, no. 10, S.1241-1250 |
| Datensatznummer |
250013493
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| Publikation (Nr.) |
 copernicus.org/angeo-16-1241-1998.pdf |
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| Zusammenfassung |
The COSCAT system enables the detection of
E-region auroral backscatter with the EISCAT remote receivers at magnetic aspect
angles close to
90 °. This is achieved by utilising a low-power transmitter
stationed in Oulu, Finland. Many important observations of E-region
irregularities have been achieved with this simple experiment. Recent studies
have attempted to push the COSCAT system to its experimental limits. Firstly,
the CW signal has been phase-modulated with 13-bit Barker codes with baud
lengths of 40, 70 and 100 µs. Interpretation of the received power allows the
spatial distribution of the auroral scatterers to be determined. The second
advance is in the use of a sophisticated correlator program which allows data to
be buffered within the correlator at very high time resolution. This enables the
coherent backscatter power to be sampled every 12.5 ms and the full
auto-correlation function to be measured every 100 ms. These measurements allow
the COSCAT system to be employed for the first time in an investigation of the
growth and decay of the auroral irregularities.
Key words. Ionosphere (ionospheric irregularities) ·
Radio science (Instruments and techniques) |
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