Dynamics and anisotropy of traveling ionospheric disturbances as deduced from transionospheric sounding data
書誌事項
- 公開日
- 1999-03
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/1998rs900004
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>This paper presents the diurnal and seasonal statistics for the dynamics and anisotropy of medium‐scale traveling ionospheric disturbances (MS TIDs) in comparison with the dynamics of small‐scale irregularities (SSIs), using data from an annual run of ETS 2 radio signal polarization, angle‐of‐arrival, and scintillation measurements at 136 MHz in Irkutsk, Russia (52°N, 104°E). In daytime, phase interference patterns have the form of traveling waves with the mean propagation direction ψ equal to 160° and rms of 68°, and phase velocity of 133 ± 62 m/s. The mean value of ψ increases in a clockwise direction from southeastward to southward and opposite to the calculated direction of the neutral wind, with the spread not exceeding 10°–30°. This result is in agreement with the hypothesis of neutral wind‐induced filtering of atmospheric gravity waves (AGW) and MS TIDs caused by them. It was found that at night, MS TIDs are characterized by a strong anisotropy; the direction of elongation (modulo 180°) is, on average, 25° less than for SSIs. This difference can be explained by assuming that medium‐scale phase disturbances detected at night are caused by magnetic‐field‐aligned irregularities located in the plasmasphere.</jats:p>
収録刊行物
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- Radio Science
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Radio Science 34 (2), 477-487, 1999-03
American Geophysical Union (AGU)
