1. THEMIS peer Instrument CDR 1 CETP, Paris, April 8, 2004 THEMIS Mission Status at Peer UCB Instrument Critical Design Review UCB, April 19/20, 2004 Vassilis Angelopoulos University of California - Berkeley

2. THEMIS peer Instrument CDR 2 CETP, Paris, April 8, 2004 Past to ~present Phase B selection: Mar 22, 2003 Science/Systems Requirements Review – Jun/Jul 2003 PDR – peer: Oct 8/9/15/16, 2003, Mission: Nov 13-14, 2003 Confirmation Readiness Review – GSFC, Feb 4, 2004 Confirmation Review – First attempt: HQ, Mar 4, 2004 (Aborted) –GSFC felt necessary to further reduce schedule risk –Developed better I&T flow, increased work, validated by GSFC Engineering –Developed 2 month slack in I&T flow, pushing launch to Oct 21 –Added P1 magnetics verification and calibration test –Added P1 EMC/EMI verification and calibration test –Added pressurant tank: increased mission deltaV to help: »mass posture (refocus bus on instrument hosting); »bus development schedule; »a compressed ascend and commissioning scenario –Lost dawn sector conjunctions; kept ascend schedule contingency –Instrument work kept-on full steam (ETU production & testing) –Test plans being detailed; test GSE/software being built –Test facilities being refurbished, procured or built –ETU vibration tests start April 21; electrical tests ongoing; TV: May

3. THEMIS peer Instrument CDR 3 CETP, Paris, April 8, 2004 ~Present to near future Peer FGM/SCM CDR – Berlin, Paris, Apr 6/8, 2004 Peer EFI/SST/ESA CDR – UCB, Apr 19/20, 2004 Peer GBO CDR – Calgary, Apr 26/27, 2004 Confirmation Review – HQ, Apr 22, 2004 –Baring further GSFC thunderbolts or risky reviews –Authority to spend >25% of cost –Can commit launch vehicle and launch date Mission CDR: UCB Jun 15/16, 2003 –Design supported by ETU results satisfies requirements –Interfaces tested and per ICD –Flight test plans detailed and to environments expected –Probe I&T plans detailed;can test compliance with instr. Req’s ETU Instrument Deliveries: April 2 nd – Jun 3 rd, 2004 ETU Instrument I&T – starts May 28 th, 2004 F1 deliveries Aug 10 th – Sep 27 th, 2004 F1 I&T at UCB mid-Aug to mid-Nov, 2004 F1 EMI/MAG testing at UCB: Oct 22/26, 2004

4. THEMIS peer Instrument CDR 4 CETP, Paris, April 8, 2004 Outlook We are relatively on-track despite 2-3 month delays in reviews We turn adversity into opportunity and –enhance technical margins –improve development program quality –increase science capacity A tribute to: –Explorer program support –Funds keep flowing – ensuring no delays –Engineering talent present and eager –Management support in scheduling and tracking –Tenacity, commitment and experience of team –Engineering excellence and success oriented attitude Expect on time delivery of Integrated Suite at end of year: –EMI/MAG testing complete on instrument suite –Bugs worked out with principal attributes of IDPU-BAU interaction