Seasonal occurrence of TIDs, propagating in waveguide (WGM) and free-wave mode (FWM).
|Solar activity cycle||Total sample size for the period||Winter
|WGM||FWM||FWM/WGM||Sample size||WGM||FWM||FWM/WGM||Sample size||WGM||FWM||FWM/WGM||Sample size|
|1997–1999 Moderate solar activity||351||0.05||0.95||17.5||74||0.18||0.74||2.8||115||0.18||0.81||4.6||162|
|2009–2010 Low solar activity||185||0.21||0.79||3.7||42||0.9||0.1||0.1||20||0.26||0.74||2.8||123|
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