This segment covers the period from 13 March 2021 to 05 June 2021 (after and including part of the short eclipse season 2021) and has 140% data volume as a baseline.

There are manoeuvres on C1 and C2 on 29/03/2021; on C1 and C2 on 09/04/2021; and on C1 and C2 on 24/05/2021; and on C1, C2 and C3 on 02/06/2021; the list of the exact manoeuvres' times is included here ​http://jsocwiki.rl.ac.uk/attachment/wiki/WikiStart/manoeuvres_aug2020_nov2021.pdf.

Cluster crosses the magnetopause through the whole segment's period, and the last predicted bow shock crossings are: 05/05/2021 on SC3 and SC4, 12/05/2020 on SC1, and 16/05/2021 on SC2.

Preliminary main science targets are magnetopause, bow shock, and inner magnetosphere hiss origin region. The BM1 data for the PEACE/WHISPER cross-calibration in the magnetosheath also will be collected.