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THEMIS Instrumentation Dr. John Bonnell Space Sciences Laboratory, UC Berkeley

THEMIS Instrumentation Dr. John Bonnell Space Sciences Laboratory, UC Berkeley. Mission Objectives and Measurements: THEMIS=Time History of Events and Macroscale Interactions during Substorms What Events to Register? What Interactions to Monitor?

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THEMIS Instrumentation Dr. John Bonnell Space Sciences Laboratory, UC Berkeley

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  1. THEMIS Instrumentation Dr. John Bonnell Space Sciences Laboratory, UC Berkeley • Mission Objectives and Measurements: • THEMIS=Time History of Events and Macroscale Interactions during Substorms • What Events to Register? • What Interactions to Monitor? • What Instruments are Required to Perceive Them? THEMIS Instrumentation - 1

  2. Mission Objectives and Measurements • THEMIS = Time History of Events and Macroscale Interactions during Substorms • What Events? • Substorm Onset (GBO All-Sky Cameras and Mags) • Current Disruption and Redirection (THEMIS Probes) • Magnetic Reconnection (THEMIS Probes) P3,P4,P5 P2 P1 1000-1500 km/s! THEMIS Instrumentation - 2

  3. Mission Objectives and Measurements • What Interactions? Plasma Flows Plasma Waves Plasma Heating Magnetic Field Reconfiguration (Reconnection, Current Diversion/Disruption) THEMIS Instrumentation - 3

  4. 2x Top Solar Panels Axial EFIBooms Top Deck SCM Boom 4x Side Solar Panels FGM Boom ESA 4x Radial EFIs 2x SSTs 2x Tang. Thruster RCS Fill / Drain Valves Probe Carrier and Probes Oblique, external view of THEMIS probe Antenna Sun Sensor IRU 2X Propulsion Tanks ESA/IDPU Radial EFIs Transponder Single Point Ground Harness Bridge (harness not shown) BAU Battery Oblique view of THEMIS probes mounted On Probe Carrier (modified D-II 3rd Stage) Shunt Top cut-away view of THEMIS probe THEMIS Instrumentation - 4

  5. EFIs EFIa SCM ESA SST FGM Tspin=3s Mission Objectives and Measurements What Instruments on the Probes? Electrostatic Analyzer (ESA) 3D e- and i+ from 5-30,000 eV Once per spin (3-s period) Electric Field Instrument (EFI) 3-axis E-Field 0-4000 Hz Search Coil Magnetometer (SCM) 3-axis B-Field 10-4000 Hz Solid State Telescope (SST) 3D e- 25-800 keV 3D i+ 25 keV- 6 MeV Once per spin (3-s period) Flux Gate Magnetometer (FGM) 3-axis B-Field 0-128 Hz THEMIS Instrumentation - 5

  6. Mission Objectives and Measurements Electric Field Instrument (EFI) 3-axis E-Field 0-4000 Hz Electrostatic Analyzer (ESA) 3D e- and i+ from 5-30,000 eV Once per spin (3-s period) Plasma Flows Plasma Waves Plasma Heating Magnetic Field Reconfiguration (Reconnection, Current Diversion/Disruption) Search Coil Magnetometer (SCM) 3-axis B-Field 10-4000 Hz Solid State Telescope (SST) 3D e- 25-800 keV 3D i+ 25 keV- 6 MeV Once per spin (3-s period) Flux Gate Magnetometer (FGM) 3-axis B-Field 0-128 Hz THEMIS Instrumentation - 6

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