THEMIS FRRSC - 1 KSC, Feb 12, 2007 SPACECRAFT OVERVIEW/STATUS Peter R Harvey THEMIS Project Manager

THEMIS FRRSC - 2 KSC, Feb 12, 2007 Mission Overview Flight Systems Processing Ground Systems Reviews Summary Agenda

THEMIS FRRSC - 3 KSC, Feb 12, 2007 Probe conjunctions along Sun-Earth line recur once per 4 days over North America. Ground based observatories completely cover North American sector; can determine auroral breakup within 1-5s … … while THEMIS’s space-based probes determine onset of Current Disruption and Reconnection each within <10s. : Ground Based Observatory Mission Science

THEMIS FRRSC - 4 KSC, Feb 12, 2007 Launch Vehicle:Delta II, Eastern Range Apogee: km ± 9567 km Perigee:435 km ± 10 km (500 km ± 7 km on or after 3/1/2007) Inclination:16.0 deg ± 0.5 deg Date:February 15, 2007 Space Segment Spacecraft:5 Spinning Probes with Fuel for Orbit & Attitude Adjust Instruments:3-Axis Electric Field, Magnetic Field 3-D Ion & Electron Particle Detectors Spin Rate:20 RPM Orbit Period(s):1, 2 and 4 days Orientation:Ecliptic Normal Ground Segment Observatories:20 Northern with All Sky Imagers and Magnetometers Control Facilities:Mission and Science Operations Centers Operations Phases:L&EO, Cruise, Ascent, Campaigns, De-orbit Lifetime:2.3 years Mission Summary

THEMIS FRRSC - 5 KSC, Feb 12, 2007 Instrument Configuration IDPU: Instrument Data Processor Unit SPB : Spin Plane Booms (4x) AXB : Axial Booms (2x) SST : Solid State Telescope (2x) ESA : Electrostatic Analyzer FGM : Fluxgate Magnetometer SCM : Search Coil Magnetometer

THEMIS FRRSC - 6 KSC, Feb 12, 2007 Fuel Tank ESA EFI SPB Thruster T1 EFI Axial Booms (2, Stowed) Battery BAU Repress Tank Miniature Sun Sensor Transponder Thruster T2 IDPU Fuel Tank Antenna EFI SPB Thruster A1 Thruster A2 AEB Gyros Probe Configuration

THEMIS FRRSC - 7 KSC, Feb 12, 2007 Standard Delta 10 ft. Fairing Static Envelope 3712 PAF Probe Carrier Assembly (PCA = 5 Probes + Probe Carrier) on L/V Probe Carrier Assembly (PCA = 5 Probes + Probe Carrier) on L/V THEMIS Launch Configuration Probe Carrier Assembly (PCA) on Delta 3 rd Stage Launch Configuration Dedicated launch accommodated within standard Delta vehicle configuration and services 10’ Composite Fairing required to accommodate five Probes on the Probe Carrier in the “Wedding Cake” configuration PC stays attached to Delta 3 rd stage after probe dispense Each probe dispense from the PCA is coordinated with but independent of the other probes No single probe anomaly precludes dispense of remaining probes Star 48 3 rd Stage

THEMIS FRRSC - 8 KSC, Feb 12, 2007 Environments Thermal Vacuum Acoustics Spin Balance EMC Vibration Magnetics

THEMIS FRRSC - 9 KSC, Feb 12, 2007 Probe Processing Bolt Cutter Installation Performance Tests Solar Array Illumination Delivery to ASO

THEMIS FRRSC - 10 KSC, Feb 12, 2007 Probe Fueling Vibration Thermal Vacuum Acoustics Spin Balance Storage Dry Weigh & Pressurize Fueling

THEMIS FRRSC - 11 KSC, Feb 12, 2007 PCA Processing Vibration Acoustics Spin Balance Storage SSS Installation Ready for Probes Final checks Spin Balance PCA Integration Fairing Installation

THEMIS FRRSC - 12 KSC, Feb 12, 2007 Ground System Diagram Ground System Elements Ground Stations Ground Network Space Network Mission Operations Center Science Operations Center Flight Dynamics Center Including Mission Design Orbit & Attitude Determination Maneuver Planning Limit Detection and Notification Network Security

THEMIS FRRSC - 13 KSC, Feb 12, 2007 Mission Operations Center BGS Antenna, Equipment Racks and FOT Workstations at the Mission Operations Center

THEMIS FRRSC - 14 KSC, Feb 12, 2007 Ground Stations Ground Station Station Designator Figure of Merit LocationFunction Berkeley, CABGS 11-m24.0 dB/K ° N ° W Primary TLM/CMD/TRK Wallops Island, VAWGS 11-m23.0 dB/K ° N ° W Secondary TLM/CMD/TRK Merritt Island, FLMILA 9-m 1/221.6 dB/K ° N ° W Secondary TLM/CMD/TRK Santiago, ChileAGO 9-m21.6 dB/K ° S ° W Secondary TLM/CMD/TRK Hartebeesthoek, SAHBK 10-m20.4 dB/K ° S ° E Secondary TLM/CMD/TRK Mission Supported by 5 Ground Stations Ground Stations: BGS, WGS, MILA, AGO, HBK GN, SN and FDF Support Documented in PSLA All Stations Have Successfully Flowed Data with MOC

THEMIS FRRSC - 15 KSC, Feb 12, 2007 LEO Acquistion LEO Acquisition Multiple Ground Assets Have Good View Following Launch Probe Attitude Around 1:30 MET is Poor for Telemetry Probes Contacted at 4Kbps for 5 Minutes each from 1:20 to 1:40

THEMIS FRRSC - 16 KSC, Feb 12, 2007 Mission Profile

THEMIS FRRSC - 17 KSC, Feb 12, 2007 LEO Early Orbit Early Orbit Activities TDRSS Pass to Observe Separation at T+73 min Round-robin Contacts –Starting at T+81min, Each Probe Will Be Contacted for 5 Mins –Expected Battery SOC to Remain > 87% Initial Orbit and Attitude Determination –Record and Process Two-way Doppler Data –Perform Attitude Determination in Real-time –Both UCB and GSFC FDF Function in Parallel Round-Robin Checkout of Key Systems on Each Probe –Reaction Control System Readiness –Attitude Sensors Functionality Perform Attitude Maneuver to Ecliptic Normal Systematic Instrument Power-up and Check-out –Leads to Decision of Probe Orbit Placement in Appx 26 Days

THEMIS FRRSC - 18 KSC, Feb 12, 2007 Ground Based Observatories UCB has Delivered All 20 GBO (GMAG and ASI) units 19 Have Been Installed, 1 Needs Repair Automatic Data Collection and Archiving in Progress Remote Commanding and Diagnostics Working Expect to be Fully Functional at Winter 2008 Courtesy H.Frey, UCB Geographic Longitude 324° Geographic Longitude 195° Geomagnetic North Pole Geographic North Pole

THEMIS FRRSC - 19 KSC, Feb 12, 2007 IIRT RFA Status IIRT Performed 27 Formal Reviews of THEMIS IIRT Issued 308 Requests for Action Project Completed all 308 IIRT Concurred on all 308 Final Two Closed since MRR RCS Proof Launch Window Analysis

THEMIS FRRSC - 20 KSC, Feb 12, 2007 Reviews Ahead

THEMIS FRRSC - 21 KSC, Feb 12, 2007 Summary Issues  Bolt Cutter Taping – Closed  P1115 Connector Demated – Closed  PCA-3 rd Stage CG Offset – Closed Summary Status  Probes and Probe Carrier are Flight Ready  Mission Operations is Complete  Launch Team and Operations Teams are Ready Readiness Statement  THEMIS is Ready to Continue Processing for Launch