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Swarm Bravo: STR instrument set at 2 Hz rate from 17 October 2018

18 January 2019

We would like to inform Swarm data users that from 17 October 2018, at 08:24:51 UTC, the attitude information of the Star Tracker instrument on board Swarm Bravo is provided at 2 Hz rate, instead of the previous 1 Hz.

This change required an update in the Level 1b processing of the rotation angles from the three Camera Head Unit (CHU) reference frames to Star Tracker Common Reference Frame, update deployed in operations on 30 December 2018.

To benefit from this rotation update, all the Swarm Bravo L1B data from 17 October to 29 December 2018 were regenerated and are now available on the Swarm FTP server with increased File Counter.

The effect of this update is a difference of no more than 2 nT in the B_NEC (North-Earth-Center frame) with respect to data available before the update.