Development of scanning narrow beam riometer
A new riometer system of high spatial resolution by means of a scanning narrow beam method is in operation at Syowa Station, Antarctica (69.0°S, 36.6°E, L=6.1) since February 1985. Ionospheric absorption of cosmic radio noise over Syowa Station within 120km in geomagnetic north-south and east-west d...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
National Institute of Polar Research
1989
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| Subjects: | |
| Online Access: | https://doi.org/10.15094/00008617 https://doaj.org/article/ba0880e9c215403099233569a8ab46d7 |
| Summary: | A new riometer system of high spatial resolution by means of a scanning narrow beam method is in operation at Syowa Station, Antarctica (69.0°S, 36.6°E, L=6.1) since February 1985. Ionospheric absorption of cosmic radio noise over Syowa Station within 120km in geomagnetic north-south and east-west directions, can be measured with a spatial resolution of 10km and a temporal resolution of 10s. The antenna system has four other fixed-direction beams pointing to the zenith and to the magnetic north, south and west with a zenith angle of 30°. Each signal from these fixed beams, constituting a separate riometer, is used for higher time resolution (0.25s) observation. This riometer system can discriminate a small-scale absorption region of a few tens of kilometers, which cannot be seen by a conventional broad beam riometer. This riometer system can also detect a drift velocity of pulsative absorption with a short wavelength of ∿100km. Comparing simultaneous observations of this riometer and a scanning photometer at Syowa Station, we found a considerable difference in spatial distribution between auroral absorption region and auroral emission region. |
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