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The end of GRACE

19 December 2017

GRACE, part of ESA's Third Party Missions programme, came to an end on 27 October. This joint mission of DLR and NASA measured the Earth's gravity field for fifteen years, much longer than the five years the satellites were expected to operate.

GRACE Operational: Planned switch-off of MWA

03 July 2017

The GRACE-A and B Microwave Assemblies (MWA) have been switched-off on 29 June 2017 13:40 UTC (GRACE-A) and 30 June 2017 18:37 UTC (GRACE-B), respectively. The GRACE-B Accelerometer Instrument Control Unit (ICU) on GRACE-B is off since 24 May 2017, the GRACE-A ICU has been switched-off on 29 June 2017 13:40 UTC.

Both activities are related to battery load reduction.

The switch-on of both MWAs is planned for approximately mid-August 2017.

GRACE operational issue: Planned switch-on and switch-off of Accelerometer Instrument Control Units

07 June 2017

The GRACE-B Accelerometer Instrument Control Unit (ICU) has been switched-on again on 02 May 2017 at 12:08 and switched-off on 24 May 2017 at 18:40.

GRACE operational issue: Planned switch-on of MWA

20 March 2017

The GRACE-A and B Microwave Assemblies (MWA) have been switched-on again on 17 March (the 15th birthday of the satellite mission!) and began operations in sunlight.

GRACE operational issue: Planned switch-off of MWA

15 February 2017

The GRACE-A and B Microwave Assemblies (MWA) were switched-off on 5 February 2017, at 00:01 UTC, and 3 February 2017, at 22:00 UTC, respectively. The GRACE-B Accelerometer Instrument Control Unit (ICU) remains off.

GRACE - Planned switch-on of MWA / ICU

21 October 2016

The GRACE-A and -B Microwave Assemblies (MWA) and the GRACE-A Accelerometer Instrument Control Unit (ICU) have been switched-on again.

GRACE operational issue: Planned switch-off of MWA/ICU

06 September 2016

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-off on 03 September 2016, 12:12 UTC.

Both activities are related to battery load reduction.

The switch-on of both MWAs and ICUs is planned for approximately beginning of October 2016.

GRACE operational issue: Planned switch-on of Microwave Assemblies and Accelerometer Instrument Control Units

11 May 2016

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-on again

  • 5 May 2016, 10:36 UTC: GRACE-B ICU
  • 5 May 2016, 10:46 UTC: GRACE-A ICU
  • 6 May 2016, 09:49 UTC: GRACE-A MWA
  • 7 May 2016, 11:00 UTC: GRACE-B MWA

GRACE operational issue: Planned switch-off of MWA/ICU

05 April 2016

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-off on:

  • 31 March 2016, 15:55 UTC: GRACE-A MWA
  • 31 March 2016, 16:05 UTC: GRACE-B MWA
  • 1 April 2016, 16:26 UTC: GRACE-A ICU
  • 1 April 2016, 16:35 UTC: GRACE-B ICU

GRACE operational: Switch-on of MWA/ICU and orbit manoeuvre

18 December 2015

Following the switch-off in October, the GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-on again.

GRACE operational issue: Planned switch-off of MWA/ICU

08 October 2015

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-off on:

  • 27 September 2015, 11:20 UTC: GRACE-B MWA
  • 27 September 2015, 13:00 UTC: GRACE-B ICU
  • 5 October 2015, 15:30 UTC: GRACE-A MWA
  • 7 October 2015, 13:40 UTC: GRACE-A ICU

GRACE operational issue: Switch-on of MWA / ICU and orbit manoeuvre

01 July 2015

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-on again on:

  • 22 June 2015, 07:22 UTC: GRACE-A and GRACE-B ICU
  • 26 June 2015, 12:02 UTC: GRACE-A MWA
  • 28 June 2015, 12:00 UTC: GRACE-B MWA

GRACE operational issue: Planned switch-off of Microwave Assemblies

14 May 2015

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) were switched-off on:

  • 11 May 2015, 07:05 UTC: GRACE-B MWA
  • 11 May 2015, 07:27 UTC: GRACE-A MWA
  • 13 May 2015, 06:36 UTC: GRACE-A and GRACE-B ICU

Both activities are related to battery load reduction.

GRACE operational issue: Planned switch-on of Microwave Assemblies

19 January 2015

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-on again on:

  • 07 January 2015, 12:03 UTC: GRACE-A and GRACE-B ICU
  • 13 January 2015, 5:32 UTC: GRACE-A MWA (continuously on since 23:40, before ca. 7-12 minutes off each orbit)
  • 13 January 2015, 5:32 UTC: GRACE-B MWA (continuously on since 06:42)

GRACE operational issue: Planned switch-off of Microwave Assemblies

10 December 2014

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) were switched-off on:

  • 3 December 2014, 14:58 UTC: GRACE-B MWA
  • 4 December 2014, 14:09 UTC: GRACE-A MWA
  • 6 December 2014, 14:04 UTC: GRACE-A and GRACE-B ICU

Both activities are related to battery load reduction.

GRACE Operational Issue: Planned switch-on of Microwave Assemblies

05 August 2014

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-on again on the below dates:

  • 31 July 2014, 14:00 UTC: GRACE-A and GRACE-B MWA (80% average on-time)
  • 02 August 2014, 14:00 UTC: GRACE-A and GRACE-B MWA (continuously on)
  • 28 July 2014, 13:11 UTC: GRACE-A and GRACE-B ICU

GRACE operational issue: Planned switch-off of Microwave Assemblies

30 June 2014

The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-off on the below dates:

  • 25 June 2014, 16:56 UTC: GRACE-A MWA
  • 24 June 2014, 17:42 UTC: GRACE-B MWA
  • 27 June 2014, 16:59 UTC: GRACE-A ICU
  • 26 June 2014, 17:44 UTC: GRACE-B ICU

GRACE operational issue: Switch-on of Microwave Assemblies

25 February 2014

Following the planned switch-off of the GRACE-A and -B Microwave Assemblies (MWA) for battery load reduction (see related news of 23 January 2014), both MWAs have been switched-on again on the below dates:

  • 21 February 2014, 07:06 UTC: GRACE-A MWA
  • 23 February 2014, 07:14 UTC: GRACE-B MWA

GRACE operational issue: Planned switch-off of Microwave Assemblies

23 January 2014

The GRACE-A and -B Microwave Assemblies (MWA) have been switched-off on the below dates:

  • 17 January 2014, 11:50 UTC: GRACE-A MWA
  • 19 January 2014, 11:58 UTC: GRACE-B MWA

GRACE issue solved - switch-on of GRACE-2 MWA

02 January 2014

On December 28 at 14:53 UTC the GRACE-2 MWA (Microwave Assembly) has been switched on again, thus re-enabling K-band SST observations between the twin satellites.

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