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Table 2 Linear fit line slopes of the echo occurrence decline in 2015–2017 (Fig. 4c, d) for various time*** sectors and radars. The time sectors were selected according to the local solar time ± 3 h

From: Occurrence of F region echoes for the polar cap SuperDARN radars

  Echo occurrence decrease slope in % per year (bands)
  CLY RKN INV DCE MCM SPS AVG
Night (0 ± 3) LT − 8.19 − 5.30 − 6.16 − 6.69 − 5.59 − 4.76 − 6.11
Dawn (9 ± 3) LT − 5.91 − 2.52 − 5.17 − 8.16 − 5.86 − 6.04 − 5.61
Day (12 ± 3) LT − 5.65 − 5.55 − 7.50 − 10.32 − 10.39 − 6.58 − 7.67
Dusk (18 ± 3) LT − 7.63 − 5.13 − 5.53 − 9.85 − 11.16 − 8.11 − 7.90
Afternoon (15 ± 3) LT − 6.3 − 4.5 − 7.0 − 10.4 − 10.8 − 9.2 − 8.03
Average (0 ± 24) LT − 6.84 − 4.63 − 6.09 − 8.75 − 8.25 − 6.37 − 6.82
  1. The bottom and the right lines show the average value of the slopes