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Isolated lower mesospheric echoes seen by medium frequency radar at 70° N, 19° E

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Table 1. Notable ILME events since 2001.
Fig. 2. Three examples of multi-day sequences of isolated lower mesospheric echo occurrence
Fig. 3. Yearly tables of month versus day for Tromsø the period 2001-5 inclusive. For days when ILME were detected (by our criteria) the total numbers of hours are indicated
Fig. 5. Electron-neutral collision frequencies as a function of sea- sea-son and altitude, obtained by combining the NRLMSIS-00 model atmosphere (Picone et al., 2002) with expressions found in Brekke (1997).
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