Paul Scherrer Institut

SREM Webmaster



  • 14 May 2009
Planck and Herschel have been launched together with an Ariane 5 from Europe's Spaceport in French Guiana.
  • 20 February 2009
Planck and Herschel will be launched on April 16, 2009. And each of them will have an SREM aboard.
  • 2 May 2008
SREM is planed to be switched-on on Wednesday, 07 May, 2008.
  • 26 April 2008
The GIOVE-B satellite with a SREM aboard was successfully launched with a Soyuz/Fregat launcher from Baikonur cosmodrome in Kazakhstan by launch operator Starsem. Lift-off occurred at 04:16 local time on 27 April (00:16 Central European Summer Time).
  • 17 November 2004
The SREM web site was updated with the data from SREM aboard Rosetta. After some modifications of the onboard software to control SREM, which were carried out during the summer, the instrument was switched on on 21 October 2004 and is planed to be continuously operated in the future.
  • 02 March 2004
Rosetta was successfully launched from Europe's Spaceport at Kourou this morning at 08:17 CET.
  • 27 February 2004
The launch of Flight 158 with the Rosetta spacecraft is delayed by a few days.
SREM aboard
SREM aboard Rosetta
  • 01 June 2003
The launch of an SREM aboard Rosetta is now scheduled for February 2004!
  • 14 Jan 2003
The launch of Rosetta has been postponed by a year or so.
  • 14 Jan 2003
Having considered the conclusions of the Review Board set up to advise on the launch of Rosetta, Arianespace and the European Space Agency have decided on a postponement.
  • 12 Jan 2003
Arianespace has decided to create a Review Board to make a decision on Tuesday, January 14 regarding Rosetta's launch date.
  • 01 Jan 2003
The IREM data is now available on this site at the DATA section.

The launch of an SREM aboard Rosetta is scheduled for 13 January 2003!

  • 01 Nov 2003
Already 9 hours after launch of INTEGRAL, IREM (Integral's Radiation Environment Monitor) was switched on and is working fine since then. The following graphs show IREM count rates for the first 5 perigee passages.

1. perige passage, 2. perige passage, 3. perige passage, 4. perige passage, 5. perige passage
S14 shows protons at > 20 MeV and TC3 shows electrons at > 0.5 MeV plus the protons.

  • 21 Apr 2002
The main test phase of PROBA 1 has been completed and SREM is planned to be operated now on a regular basis. New SREM data can be expected to be processed and put on this site in intervalls of approximately 10 days.
  • 05 Apr 2002
Since December 2001 SREM was continued to be operated only sporadically. The data accumulated so far is now available for download in the DATA section. A few PowerPoint slides showing some of the data are also available.
  • 12 Dec 2001
Commissioning phase with only sporadic operation of SREM is still continuing. So far SREM was only switched on a few times.
  • 14 Nov 2001
While commissioning tests are carried out on PROBA 1, SREM is switched off since 8 November 2001. SREM will be switched on again after the tests have been finished.
  • 09 Nov 2001
More test runs of PROBA1/SREM have been carried between November 1 and 7. The measurements have been interrupted a few times by the occurrence of a 'watch-dog elapsed' error. Nevertheless the gathered data looks good! Results are summarized in a short report.
  • 01 Nov 2001
Short test runs of PROBA1/SREM have been carried out on October 28 and 29. Preliminary results indicate that the instrument works well.
  • 22 Oct 2001
Launch of Indian rocket PSLV-C3 with PROBA aboard!!

Updates on the status can be found at the home page of the Indian Space Research Organization ISRO and at the PROBA home page.

  • 11 Oct 2001
Launch of Proba now fixed to 22 October 2001 .
  • 04 Sep 2001
Launch of Proba delayed again. New launch window between 8 and 14 October 2001 .
  • 28 Aug 2001
SREM web site migrated to new server!
  • 13 July 2001
Proba flight acceptance review. New schedule: ship 27 Aug - 1 Sept, and launch 25 Sept. However, the board did not think risks should be introduced by trying to meet the schedule. So there will be a delta review just before the shipping.
  • 10 July 2001
Launch of Integral delayed. New launch date is 17 October 2002 .
  • 22 May 2001
Launch of PROBA with Indian rocket PSLV-C3 scheduled for August 2001. PROBA will be launched together with the BIRD satellite from DLR.
  • 22 Mar 2001
Final report on Strv1c/d anomaly was published and is available on request.
In summary: Recovery of the missions is not expected!!
  • 28 Feb 2001
The Strv1c/d anomaly was reproduced with flight spare hardware. Some further tests are needed to identify precisely which component has failed and determine the failure mechanism. See status report.
The target for the final report of the investigation is now 15 March 2001.
  • 21 Dec 2000
Ongoing investigations of the cause of the Strv1c/d receiver problem. Final results not to be expected before end of February 2001. See status report.
  • 14 Dec 2000
Cause for Strv1c/d receiver problem not identified yet, but progress was made in eliminating possibilities and focusing the investigation. See status report.
  • 07 Dec 2000
Problems with Strv1c/d spacecrafts. Receivers powered down between link sessions. Tests are going on to identify the cause. See status report.
  • 01 Dec 2000
Routine operation of the Strv1c instrument has started yesterday. New SREM data is expected to arrive in a few days.
  • 30 Nov 2000
First data from SREM. During the check-out of all STRV-1c & d experiments, SREM has been switched on and was operated for a short period. The data indicate that SREM is fine and works well. A summary report is available.
  • 16 Nov 2000
Successful launch of Strv-1c and Strv-1d !!

See Strv1c/d status reports

  • 15 Nov 2000
The launch of Arianespace Flight 135 has been postponed for one day following an anomaly in the ground-based infrastructure at the Spaceport in French Guiana. This anomaly, which affected the telemetry link with the PAS-1R satellite, occurred during the final countdown on Nov. 14.
As a result, Flight 135 has been delayed for 24 hours. The launch window is (Paris time) from 2:07 a.m. to 3:03 a.m. on November 16.
  • 09 Nov 2000
Flight 135's Ariane 5G
Flight 135's Ariane 5G moves from the integration building to the final assembly on the new mobile launch table. In foreground is the no. 1 Ariane 5 launch table, which will be moved into the integration building to prepare for the next Ariane 5 mission.
  • 10 Oct 2000
There was a delay in the shipment of Panamsat to French Guiana and associated with this Arianespace introduced an Ariane-4 launch into the gap in the manifest. This launch occurred successfully at the weekend, and another Ariane-4 is still scheduled at the end of the month. The STRV flight, Ariane-507, is now scheduled for 14 November, 2000
  • 07 Oct 2000
Successful SREM tests at launch site in Kourou
  • 15 Aug 2000
Launch of Strv-1c is scheduled for 31 October, 2000.
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Strv 1c/d status reports

Richard Blott
Business Group Manager Research Satellites and Propulsion
Tel: +44 (0) 1252 395698, FAX: +44 (0)1252 375329,

  • STRV 1C&D STATUS - 27 Feb 2001
  • STRV 1C&D STATUS - 21 Dec 2000
  • STRV 1C&D STATUS - 13 Dec 2000
  • STRV 1C&D STATUS - 06 Dec 2000
  • STRV 1C&D STATUS - 24 Nov 2000
  • STRV 1C&D STATUS - 22 Nov 2000
  • STRV 1C&D STATUS - 17 Nov 2000
  • STRV 1C&D LAUNCH - 15 Nov 2000

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