THEMIS SWG, April 9-11, 2008 THEMIS E/PO THEMIS E/PO M. B. Moldwin, and L. M. Peticolas URL: .
THEMIS Instrumentation Dr. John Bonnell Space Sciences Laboratory, UC Berkeley
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Transcript of THEMIS Instrumentation Dr. John Bonnell Space Sciences Laboratory, UC Berkeley
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THEMIS Instrumentation - 1Polar Gateways 200823-29 Jan 2008
THEMIS InstrumentationDr. 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?
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THEMIS Instrumentation - 2Polar Gateways 200823-29 Jan 2008
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)
P1P3,P4,P5 P21000-1500 km/s!
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THEMIS Instrumentation - 3Polar Gateways 200823-29 Jan 2008
•What Interactions?
Mission Objectives and Measurements
PlasmaHeating
Plasma Flows
Plasma Waves
Magnetic Field Reconfiguration(Reconnection, Current Diversion/Disruption)
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THEMIS Instrumentation - 4Polar Gateways 200823-29 Jan 2008
Antenna
4x Side Solar Panels
Top Deck
4x Radial EFIs
Axial EFIBooms
SCM Boom
FGM Boom
2x Top Solar Panels
2x SSTs2x Tang. Thruster
RCS Fill / Drain Valves
ESA
Shunt
2X Propulsion Tanks
Transponder
Battery
Sun Sensor
ESA/IDPU
BAU
IRU
Single PointGround Harness
Bridge (harness
not shown)
Radial EFIs
Probe Carrier and Probes
Top cut-away view of THEMIS probe
Oblique, external view of THEMIS probe
Oblique view of THEMIS probes mountedOn Probe Carrier (modified D-II 3rd Stage)
THEMIS Stats
Probe Dimensions 80x80x40 cm
Instrument Package 25.7 kg
Probe Dry Mass (Instruments+SC) 77.0 kg
Probe Fuel 49.0 kg
Probe Wet Mass (Dry+Fuel) 126.0 kg
Instrument+SC Power 33.6 W
Data Volume per Orbit 370 Mbits
Data Rate to Ground 1 kbps
to 1 Mbps
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THEMIS Instrumentation - 5Polar Gateways 200823-29 Jan 2008
SST
ESA
EFIa
EFIs
FGM
SCM
Tspin=3s
What Instruments on the Probes?
Mission Objectives and Measurements
Electrostatic Analyzer (ESA)3D e- and i+ from 5-30,000 eVOnce per spin (3-s period)
Solid State Telescope (SST)3D e- 25-800 keV3D i+ 25 keV- 6 MeVOnce per spin (3-s period)
Flux Gate Magnetometer (FGM)3-axis B-Field0-128 Hz
Search Coil Magnetometer (SCM)3-axis B-Field10-4000 Hz
Electric Field Instrument (EFI)3-axis E-Field0-4000 Hz
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THEMIS Instrumentation - 6Polar Gateways 200823-29 Jan 2008
Mission Objectives and Measurements
PlasmaHeating
Plasma Flows
Plasma Waves
Magnetic Field Reconfiguration(Reconnection, Current Diversion/Disruption)
Electrostatic Analyzer (ESA)3D e- and i+ from 5-30,000 eVOnce per spin (3-s period)
Solid State Telescope (SST)3D e- 25-800 keV3D i+ 25 keV- 6 MeVOnce per spin (3-s period)
Flux Gate Magnetometer (FGM)3-axis B-Field0-128 Hz
Search Coil Magnetometer (SCM)3-axis B-Field10-4000 Hz
Electric Field Instrument (EFI)3-axis E-Field0-4000 Hz