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SREM onboard STRV1-c 


1. Description of activity

The next two microsatellites in the Space Technology and Research Vehicle (STRV) programme of the UK Defense Evaluation and Research Agency (DERA), STRV1-c and STRV1-d, will be launched into geostationary transfer orbit in 1999. One of the two satellites, the STRV1-c, will be carrying ESA's Standard Radiation Environment Monitor (SREM) unit to measure energetic electrons, protons, and heavy ions, as well as the total accumulated dose, encountered during the mission. This information will be made available in real time to the other experimenters onboard the satellite and, in due course, implemented as a part of the overall SREM measurement data base at the Paul Scherrer Institute (PSI), Switzerland, together with data from other SREM units in other missions. 

In many ways, the SREM/STRV1-c mission can be seen as a follow-on activity to the successful REM flights onboard STRV1-b and the Russian space station MIR. Valuable new results concerning e.g. flux anisotropy, electron belt dynamism, and seasonal changes have been obtained, and it is anticipated that such discoveries will be continued to be made by the SREM during the STRV1-c mission.


2. Team responsible

The operator and owner of the STRV1-c&d spacecraft is DERA, while the SREM data will be handled by PSI. The mission requirements of the SREM have been defined by ESTEC (TEC-EES). The contact persons are :

  • A. Mohammadzadeh, ESTEC (TEC-QCA), SREM project manager for STRV-1c
  • E. Daly, ESTEC (TEC-EES), co-investigator, mission definition
  • P. Nieminen, ESTEC (TEC-EES), co-investigator, mission definition
  • Pierrik Vuilleumier, ESTEC (TEC-SP), SREM engineering designer
  • Roberto Aceti, ESTEC (IMT-TTD), SREM sponsor
  • Paul Buehler, PSI, SREM principal investigator
  • Alex Zehnder, PSI, co-investigator
  • Wojtek Hajdas, PSI, co-investigator, simulations
  • Angela Cant, DERA, STRV1-c spacecraft manager

3. Meetings

  • 1st STRV1-c&d Quarterly Progress Meeting, Farnborough, 4 June 1997
  • STRV1-c&d Radiation Experiments Group meeting, Farnborough, 4 June 1997
  • 2nd STRV1-c&d Quarterly Progress Meeting, Farnborough, 9 September 1997
  • STRV1-c&d Radiation Experiments Group meeting, Farnborough, 10 September 1997
  • 3rd STRV1-c&d Quarterly Progress Meeting, Farnborough, 9 December 1997
  • 4rd STRV1-c&d Quarterly Progress Meeting, Farnborough, 2 April 1998
  • 5th STRV1-c&d Quarterly Progress Meeting, Farnborough, 30 June 1998
  • 6th STRV1-c&d Quarterly Progress Meeting, Portsdown, 9 September 1998
  • STRV1-c&d Radiation Experiments Group video conference, Farnborough, 7 December 1998
  • 7th STRV1-c&d Quarterly Progress Meeting, Farnborough, 8 December 1998

The minutes of the meetings are maintained by DERA in their ftp site. If these, or some of the other documentation is required, please contact P. Nieminen at ESTEC (TEC-EES).


4. Energy binning

The table below summarises the envisaged proton and electron energy binning of SREM onboard STRV1-c. There is room for adjustments in the discriminator levels, such that other binning schemes, more suitable to other types of radiation environments than the GTO, can also be implemented. For more information on the technical details of the SREM, please contact H.J. Schneider at the SREM manufacturer Oerlikon-Contraves.
 

 

Logic 

dE discr.  level [MeV] 

Particle 

E min  [MeV] 

E max  [MeV] 

1.

D1 

0.085 

Proton  Electron

20 1.0

Inf.

2.

D1 

0.25

Proton 

20 

550

3.

D1 

0.6

Proton 

20 

120

4.

D1 

2.0

Proton

20 

27

5.

D1 

3.0

Proton

20 

34

6.

D2 

0.085

Proton

39 

Inf.

7.

D2 

9.0

Ions

Dep. on Z 

Dep. on Z

8.

D1*D2 

0.6, 2.0

Proton  coincidence

40 

50

9.

D1*D2 

0.6, 1.1-2.0

Proton  coincidence

50 

70

10.

D1*D2 

0.6, 0.6-1.1

Proton  coincidence

70 

120

11.

D1*D2 

0.085-0.6,  0.085-0.6

Proton  coincidence

130 

Inf.

12.

D3 

0.085

Electron Proton

0.5 10

Inf.

13.

D3 

0.25

Electron

0.55 

2.3

14.

D3 

0.75

Proton

11 

90

15.

D3 

2.0

Proton

11 

30


5. Additional information

Other missions/experiments that in future will fly one or more SREM units are:
 

  Integral

International Space Station (ISS), two units in the CREEP package on the Technology Exposure Facility (TEF) are likely

PROBA    

 

Additionally, the possibility of including an SREM in some or all of the following projects is at this point investigated:
 
 

  Rosetta

 
  Smart-1 

Mars Express

FIRST/Planck

Bepi Colombo


 P. Nieminen  (TEC-EES)
16 December 1998

04-Oct-2007

 

 
 

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