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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

a Latitudinal and b longitudinal lag numbers of the maximum ACF at each time epoch for the time lag from − 50 to 50 min at an interval of 10 min for the detrended TEC within the area of 133.0°–137.0° E and 33.0°–37.0° N between 14:00 and 16:00 UT on 8 June 2019. Solid line in each panel represents regression line of latitudinal (longitudinal) lag number with respect to the lag time of the maximum ACF, assuming that the regression line passes the origin. To obtain the regression line, inverse of lag number in latitude (longitude) was used as a weighting function

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