On the visibility and zenithal confinement of 150 km (F1) radar echoes
Five‐beam radar measurements of the so‐called 150 km (or F1) echoes, from Pohnpei (7.0°N, 158.2°E, geographic; 0.6°N dip latitude), are used to show, for the first time, that they are weaker and occur much less frequently at zenith angles of ±30°, than those that are observed overhead or at zenith a...
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| Veröffentlicht in: | Geophysical research letters 2007-11, Vol.34 (21), p.n/a |
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| creator | Tsunoda, Roland T. Ecklund, Warner L. |
| description | Five‐beam radar measurements of the so‐called 150 km (or F1) echoes, from Pohnpei (7.0°N, 158.2°E, geographic; 0.6°N dip latitude), are used to show, for the first time, that they are weaker and occur much less frequently at zenith angles of ±30°, than those that are observed overhead or at zenith angles of ±14°, in the vertical east‐west plane. This confinement of F1 echoes to a narrow range of zenith angles is interpreted in terms of an angular spectrum of plane plasma waves with wave vectors that are similarly restricted in zenith angle. Another manifestation of this viewing aspect sensitivity could be the appearance of F1 echoes as bands, when plotted as a function of altitude and local time. Although the exact nature of this process is not known, a two‐step interchange process acting on a solar‐produced gradient in plasma density is suggested as a working hypothesis. |
| doi_str_mv | 10.1029/2007GL031276 |
| format | Article |
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This confinement of F1 echoes to a narrow range of zenith angles is interpreted in terms of an angular spectrum of plane plasma waves with wave vectors that are similarly restricted in zenith angle. Another manifestation of this viewing aspect sensitivity could be the appearance of F1 echoes as bands, when plotted as a function of altitude and local time. 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| source | Wiley Journals; Wiley-Blackwell AGU Digital Library; EZB-FREE-00999 freely available EZB journals; Wiley Online Library (Open Access Collection) |
| subjects | 150 km echoes Earth sciences Earth, ocean, space equatorial F region Exact sciences and technology ionospheric irregularities |
| title | On the visibility and zenithal confinement of 150 km (F1) radar echoes |
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