Figure 1From: Long-term variation in the upper atmosphere as seen in the geomagnetic solar quiet daily variationSpatial distribution of the geomagnetic stations. Spatial distribution of the geomagnetic stations that observed the linear or nonlinear relationships between the solar F10.7 index and Sq amplitude. The geomagnetic stations are plotted as blue and red triangles on the world map. The blue and red colors indicate the linear and nonlinear relationships, respectively.Back to article page