First VHF radar observation of midlatitude F‐region field‐aligned irregularities
Fukao, S.; McClure, J. P.; Ito, A.; Sato, T.; Kimura, I.; Tsuda, T.; Kato, S.; Fukao, S.; Radio Atmospheric Science Center, Kyoto University; McClure, J. P.; Center for Space Science, University of Texas at Dallas; Ito, A.; Department of Electrical Engineering, Kyoto University; Sato, T.; Radio Atmospheric Science Center, Kyoto University; Kimura, I.; Department of Electrical Engineering, Kyoto University; Tsuda, T.; Radio Atmospheric Science Center, Kyoto University; Kato, S.; Radio Atmospheric Science Center, Kyoto University
Журнал:
Geophysical Research Letters
Дата:
1988
Аннотация:
We describe the first midlatitude F‐region VHF radar observations of small‐scale Field‐Aligned Irregularities (FAI). Looking northward at ∼ 34° elevation the locus of perpendicularity with the geomagnetic field B remains inside the radar beam, such that FAI can be observed, at radar ranges from 350 to over 800 km or F region altitudes from 200 to 500 km, approximately. The preliminary results presented here show the large‐scale (> 20 km) configuration of small‐scale (322.6 cm, half the radar wavelength) F‐region irregularities as well as typical spectral results. Our most important finding is that at least on some occasions there is a quasi‐periodic variation in time and space, on scales of approximately 12 minutes and 50 km, of the observed plasma instabilities.
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