HF radar observation of ionospheric irregularities with unusual behaviour
HF radar observation of ionospheric irregularities with unusual behaviour
- Author(s): A. Bourdillon ; P. Dorey ; S. Saillant
- DOI: 10.1049/cp.2009.0022
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- Author(s): A. Bourdillon ; P. Dorey ; S. Saillant Source: IET 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009), 2009 p. 1 – 3
- Conference: IET 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009)
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- DOI: 10.1049/cp.2009.0022
- ISBN: 978 1 84919 123 4
- Location: Edinburgh, UK
- Conference date: 28-30 April 2009
- Format: PDF
HF radar ionospheric echoes have been observed at mid latitudes, exhibiting a very unusual behaviour in the RTI (Range-Time-Intensity) display with fast quasi-periodic variations of the power of the echoes in the range 1-10 seconds. A wavelet analysis reveals that periodicities are in fact present in the data ranging from 1 second up to 400 seconds, depending on the time of observation. The strongest radar echoes were recorded during the first 40 minutes of the experiment. The radar used for these observations offers the possibility to perform scanning in elevation and in azimuth by software. Elevation scans have been used to estimate the height of the echoing region. Apparently the echoes are not coming exactly from the aspect-sensitive region. This result must be considered carefully because at HF frequencies refraction of radio waves easily produces ray bending.
Inspec keywords: HF radio propagation; ionospheric electromagnetic wave propagation; radar cross-sections; ionospheric disturbances
Subjects: Atmospheric, ionospheric and magnetospheric techniques and equipment; Radiowave propagation; Radiowave and rocket soundings of the ionosphere; Ionospheric disturbances and modification experiments; Ionospheric electromagnetic wave propagation
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