First VHF radar observation of midlatitude F‐region field‐aligned irregularities

S. Fukao, J. P. McClure, A. Ito, T. Sato, I. Kimura, T. Tsuda, S. Kato

doi:10.1029/gl015i008p00768

First VHF radar observation of midlatitude F‐region field‐aligned irregularities

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書誌事項

公開日: 1988-08

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/gl015i008p00768

公開者: American Geophysical Union (AGU)

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説明

<jats:p>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.</jats:p>