This segment covers the period from 05 June 2021 to 10 September 2021 (before and including part of the long eclipse season 2021) and has 140% data volume as a baseline.

For the eclipse season the payload will be off, the preliminary dates are:

• C1: 09/09/2021 21:00 - 19/09/2021 00:00
• C2: 09/09/2021 21:00 - 16/09/2021 18:00
• C34: 07/09/2021 19:00 - 14/09/2021 16:00

There are no moon eclipses during this segment.

There will be manoeuvres on 11th June 2021 on C123, the full list of manoeuvres for this period is included here ​http://jsocwiki.rl.ac.uk/attachment/wiki/WikiStart/manoeuvres_aug2020_nov2021.pdf.

Cluster crosses the predicted magnetopause until: C1 - 21/06/2021, C2 - 24/06/2021, C34 - 17/06/2021. Cluster crosses the predicted neutral sheet from: C12 - 09/07/2021, C34 - 10/07/2021.

The main science targets are the Cluster/MMS conjunctions at the magnetopause and inside the magnetosheath, skimming magnetopause, conjunctions in the plasmasheet between Cluster with MMS and/or THEMIS, and hiss origin. The BM1 data for the PEACE/WHISPER cross-calibration in the magnetosheath also will be collected.