Received: 3 January 2019
Accepted: 6 June 2019
First Online: 21 June 2019
Availability of data and materials
: All the Cluster data can be retrieved online from the Cluster Science Archive (CSA) website ExternalRef removed. The solar wind data were retrieved from the OMNIWeb online database ExternalRef removed. Finally, the TIMED data (used to estimate the EUV intensity and flux) were retrieved for SEE instrument; ExternalRef removed
: The authors declare that they have no competing interests.