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Table 3 Slopes in %/(km/s) and intercepts in % of a linear fit to scatter plots of echo occurrence rate versus E × B magnitude for near noon observations

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

Density bin

Spring slope/intercept

Summer slope/intercept

Fall slope/intercept

Winter slope/intercept

\( N_{\text{e}} < 2 \times 10^{11} {\text{m}}^{ - 3} \)

8.7/16

30.6/14

21.3/17

− 10.3/39

\( 2 \le N_{\text{e}} < 3 \times 10^{11} {\text{m}}^{ - 3} \)

27.5/27

38.4/18

29.0/24

− 4.6/49

\( 3 \le N_{\text{e}} < 4 \times 10^{11} {\text{m}}^{ - 3} \)

20.3/36

29.2/31

24.9/33

1.7/53

\( N_{\text{e}} > 4 \times 10^{11} {\text{m}}^{ - 3} \)

17.2/40

17.2/40

20.8/37

9.5/48