Figure 4
From: Long-term variation in the upper atmosphere as seen in the geomagnetic solar quiet daily variation
Long-term variation in the solar F10.7 index and Sq amplitude. Long-term variation in the solar F10.7 index (a) and Sq amplitude obtained at Chambon-La-Foret (b), Niemegk (c), Furstenfeldbruck (d), and Memanbetsu (e) in the middle-latitude region. The format of this figure is the same as that of Figure 1. The solar F10.7 index a displays the same data as that in panel a of Figure 1.