This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Ionosfri kihistus peval. et Kihtide nimetused vabade elektronide kontsentratsiooni jaotus ja domineerivad ioonid erinevatel krgustel IonosphereProfileNOAA Dave Anderson and Tim FullerRowell PDUSGov Uploaded with Ionosphere Diagrams in Estonian
Page 2023 Free-images.com. All images are Public Domain