Figure 6From: Long-term variation in the upper atmosphere as seen in the geomagnetic solar quiet daily variationLong-term variation in the residual Sq amplitude obtained at six geomagnetic stations. (Addis Ababa, Trivandrum, Kakioka, San Juan, Chambon-La-Foret, and Niemegk). These stations cover a wide latitudinal region from the dip equator to middle latitudes. The vertical scale is ±40 nT for all the stations.Back to article page