This segment covers the period from 06 June 2020 to 11 September 2020 (before the eclipse season) and has 130-135% data volume as a baseline, however in some orbits the data rate was increased above the baseline value.

For the eclipse season the payload will be off, the preliminary dates for the payload to be switched off before the eclipse season are: on C34 - 04/02/2020(the first eclipse is on 05/09/2020 10:09/10:24) and on C12 - 06/09/2020 (the first eclipse is on 07/09/2020 14:48/15:04).

There are manoeuvres on C2 on 12/06/2020; on C2 on 08/08/2020; on C1 on 08/01/2020; and on C2 on 15/08/2020; for more information ​http://jsocwiki.rl.ac.uk/attachment/wiki/WikiStart/manoeuvres_may2020_dec2020.pdf.

Cluster crosses the magnetopause until mid-June and starts to cross neutral sheet from 10/11 July 2020. Primary science targets are skimming magnetopause, neutral sheet and ECS GI programme on sub-ion magnetic holes in the plasma sheet.