1. Institute for Atmospheric Science and Climate ISAC‐CNR Rome Italy
2. Department of Physics and Astronomy University of Bologna Bologna Italy
3. Birkeland Centre for Space Science, Department of Physics and Technology University of Bergen Bergen Norway
4. INAF‐OAS National Institute for Astrophysics Bologna Italy
5. INAF‐IAPS National Institute for Astrophysics Rome Italy
6. Earth Networks Germantown Maryland USA