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Study of mid-latitude nighttime enhancement in F-region electron density using tomographic images over the UK

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Fig. 1. Map showing the locations of the sites with tomography receiving equipment in the UK.
Fig. 2. Examples of mid-latitude nighttime enhancements in F-region electron density of the ionosphere, along with the occurrences of the mid-latitude trough (a) on 16 October 1998 at 02:17 UT and (b) on 27 November 1997 at 00:17 UT.
Fig. 3. Histograms showing (a) local time occurrences of nighttime enhancements and (b) their monthly occurrences during the four representative months.
Fig. 4. Plot showing the latitudes of nighttime enhancements versus local time.
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