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Fig. 13.


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TID occurrence and solar spot numbers in 1987–2010: 1 – linear regression of TID occurrence; 2 – W/100, W is yearly average Wolf number; 3 – TID occurrence without a linear trend, 4 – the occurrence of TIDs propagating in waveguide and free-wave modes and their linear regressions for the period from 1997 to 2010.

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