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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

From: Solar activity dependence of medium-scale traveling ionospheric disturbances using GPS receivers in Japan

Fig. 6

Twenty-two year variations of yearly mean of a solar activity index, F10.7; b MSTID activity; c MSTID occurrence rate; d and e horizontal propagation direction (azimuth clockwise from due north) and phase velocity of MSTID, respectively, between 1998 and 2019. Red and blue curves represent daytime (average over 09–15 LT between May and August) and nighttime (average over 19–01 LT on January and December) MSTIDs, respectively

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