1. INAF‐IAPS, National Institute for Astrophysics Rome Italy
2. Birkeland Centre for Space Science University of Bergen Bergen Norway
3. INAF‐Osservatorio di Astrofisica e Scienza dello Spazio di Bologna (OAS) National Institute for Astrophysics Bologna Italy
4. ISAC‐CNR, Institute for Atmospheric Science and Climate Rome Italy
5. Dipartimento di Fisica Università di Roma “Tor Vergata” Rome Italy
6. Dipartimento di Fisica e Scienze della Terra University of Ferrara Ferrara Italy
7. Department of Physics and Astronomy University of Bologna Bologna Italy