This segment covers the period from 03 December 2021 to 19 March 2022(before and including majority of the long eclipses season 2021) and has 140% data volume as a baseline.

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

• C1: 26/02/2022 06:00 - 29/03/2022 10:00
• C2: 24/02/2022 00:00 - 31/03/2022 10:00
• C34: 26/02/2022 06:00 - 22/03/2022 16:00

There is no moon eclipses during this segment.

There will be manoeuvres 10/02/2022 on C134, on 17/02/2022 on C1234, on 24/02/2022 on C3, the full list of manoeuvres for this period is included here ​​http://jsocwiki.rl.ac.uk/attachment/wiki/WikiStart/manoeuvres_mar2021_apr2022.pdf.

Cluster crosses the predicted bow shock from: C2 - 24/12/2021, C1 - 26/12/2021, C34 - 04/01/2022.

The main science targets are the magnetopause, bow shock, magnetosheath, conjunctions between Cluster with MMS and/or THEMIS, and hiss origin. The primary science target is magnetosheath high-speed plasma jets. The BM1 data for the PEACE/WHISPER cross-calibration in the magnetosheath also will be collected.

Special operations for two BM1 intervals with good conjunctions between Cluster, MMS and THEMIS during eclipse season are also planned.

Manoeuvres plan, manoeuvres_mar2021_apr2022.pdf, was updated in October 2021, with originally planned slew manoeuvres on 09/02/2022 on SC134 being moved to 10/02/2022 to accommodate good triple conjunction between Cluster, THEMIS and MMS.

The MSP46.1 segment science planning was updated on 26/10/2021 to maximize triple conjunctions between Cluster, THEMIS and MMS for the studies of the magnetosheath high-speed plasma jets. The changes are reflected in the tables marked by version 1, *v1* in the file name, and in the Bryant plots with the MSP version 4611, v4611.

Science planning for orbit 3415 (PP1110) was changed on 09/12/2021, with BM2 mode reduction by 5 mins: 04/02/2022 09:15-10:10 BM2 for the equatorial chorus, reflected in the attached 4SC BM2 table with *v3* in the name.

* Science planning for the last PP of the segment, PP1113, orbits 3422-3434, was changed on 21/12/2021 to reflect the start dates for the eclipse season issued by ESOC and changes in the BM1 mode operations during eclipse season. Attached files *byorbit*v3* and *4SC_BM1*v3* reflect the changes.