EFW%20operational%20on%20all%20four%20SC

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Welcome to Uppsala!
Mats André mats.andre_at_irfu.se

• Thursday May 18
• 1300, room Å4003
• 1500 Coffee
• (1730 Dinner)
• Friday May 19
• 0900, room Å4003
• 1000 Coffee
• splinters (other locations)
• 1130 Lunch
• 1300 Room Å4003
• splinters (other locations)
• 1530 end meeting

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Draft Agenda May 18

• Welcome, Cluster and EFW basics and status (MA)
• EFW modes and operations (AIE)
• EFW internal burst mode statistics (NE)
• EFW SC 1 and 3 operations (AIE, YK)
• Cluster data sets CDs, DDS, CSDS, CAA (PAL)
• The CAA where we are and where we are going (HL)
• Data exchange (beyond standard archives) (AV,
  SB)
• Coffee
• CAA data production (YK)
• Revised look at plasma densities from Cluster SC
  potential (AP)
• Polar wind measurements from wake studies (AIE)
• ISADT analysis software (AIE, YK. RG)
• Publications and future meetings (MA)
• AOB

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Cluster Mission Overview

• Launch summer 2000
• Nominal mission 2001 and 2002 (50)
• Extension 1 2002 to 2005 (100)
• Extension 2 2005 to 2009 (100)
• All spacecraft fully operational

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Separation distance strategy
C1,C2,C3
C3,C4
d
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Tail 2005
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Cluster Instrument Status

• Most instruments are operational
• Not operational
• ASPOC C1 (presently no ASPOC running)
• CIS C2
• EDI C4

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EFWElectric Field and Wave
www.cluster.irfu.se/efw gt operations gt EFW for
Dummies
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Common EFW Modes

• Normal Mode Telemetry (full orbit)
• 2 E-field signals, 25 samples/s
• 4 single probe signals, 5 samples/s
• Burst Mode 1 Telemetry (hour)
• 2 E-field signals, 450 samples/s
• 4 single probe signals, 5 samples/s
• Internal EFW burst (around 10 s)
• 4 single probe signals, few 1000 samples/s

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EFW operational on all four SC

• SC 1 Problem probe 1, 2001-12-28,
• somewhat reduced science data.
• SC 2 Filter problem, 2001-07-25.
• Solution use 180 Hz filter also
• in NM (25 samples/s) on all probes.
• SC 3 Problem probe 1, 2002-07-29,
• somewhat reduced science data.
• SC 4 OK

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SC 1, probe 1 and SC 3, probe 1

• First workaround use only probe pair 34
• EFW prime parameters (4s) OK
• Reprogrammed to use 3 probes to get
• 2 orthogonal E (routine operations from
• late September 2003)
• From January 2006
• In NM, use only probe pair 34 for E
• use probe 2 to get SC potential at 25
  samples/s

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SC spin axis tiltWHISPER proposal
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SC spin axis tilt

• Tilt is feasible
• Thermal
• main constraint
• Decide later
• Duration
• a few weeks
• 45 degrees?
• Apil 2007?

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http//sprg.ssl.berkeley.edu/themis/flash.html
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EFW webpage

• www.cluster.irfu.se