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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.

GRACE Operational Issue: Unplanned switch-off of GRACE-2 ICU and MWA

30 December 2013

On 24 December at 21:00 UTC a weak battery cell on GRACE-2 caused a voltage drop, triggering a controlled switch off of the ICU (Instrument Control Unit) and MWA (Microwave Assembly).

GRACE - Switch-on of ICU and MWA

25 September 2013

Following the planned switch-off of the GRACE Accelerometer ICUs and Microwave Assemblies for battery load reduction (see related news of 8 August 2013), all instruments have now resumed operations.

GRACE - Planned switch-off of ICUs and MWA

08 August 2013

The GRACE-A and -B accelerometer Instrument Control Units (ICU) and Microwave Assemblies (MWA) have been switched-off for battery load reduction.

The switch-on of both ICUs and MWAs is planned for approximately mid of September 2013.

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