The Electric and Magnetic Field Instrument Suite and Integrated Science on the Radiation Belt Storm Probes C. A. Kletzing Department of Physics and Astronomy The University of Iowa craig-kletzing@uiowa.edu T HE U NIVERSITY OF I OWA 1 ICRBSW 2012 1
EMFISIS Science Overview • RBSP Mission Overarching Science Questions • Which physical processes produce radiation belt enhancement events? • What are the dominant mechanisms for relativistic electron loss? • How do ring current and other geomagnetic processes affect radiation belt behavior? EMFISIS makes critical contributions to all of these science questions by identifying and determining the properties of the w ave fields (both E and B) that interact w ith radiation belt particles over frequencies of DC – 12 kHz. EMFISIS provides essential magnetic field measurements to understand global effects of ring current variations as w ell as the orientation for the RBSP particle measurements. T HE U NIVERSITY OF I OWA 2 ICRBSW 2012 2
Key Wave Regions Wave-particle interactions are involved in both acceleration and loss of radiation belt particles Two identically instrumented satellites is a first! T HE U NIVERSITY OF I OWA 3 ICRBSW 2012 3
Radiation Belt Waves T HE U NIVERSITY OF I OWA 4 ICRBSW 2012 4
EMIC Waves T HE U NIVERSITY OF I OWA 5 ICRBSW 2012 5
Magnetosonic Equatorial Noise Signature • Santolik, 2004 analyzed 781 intvervalsof Cluster data • Limited to below 4 kHz T HE U NIVERSITY OF I OWA 6 ICRBSW 2012 6
RBSP Satellite Configuration EFW Axial Boom (fwd and aft) EMFISIS MAG Boom EFW Spin Plane Wire Boom (4x) EMFISIS Search Coil Boom ECT MagEIS (High and Medium 35) ECT REPT ECT MagEIS RPS (Low 75 and Medium 75) ECT HOPE RB-Spice T HE U NIVERSITY OF I OWA 7 ICRBSW 2012 7
EMFISIS Team Leads University of Iowa: Dr. Craig Kletzing, EMFISIS PI Dr. William Kurth, Waves Lead Goddard Space Flight Center: Dr. R. MacDowall MAG lead University of New Hampshire: Dr. Roy B. Torbert, CDPU Lead UC, Los Angles Dr. Richard Thorne Los Alamos National Lab Dr. Vania Jordanova T HE U NIVERSITY OF I OWA 8 ICRBSW 2012 8
Fields Capabilities DC Magnetic EMFISIS FGM EMFISIS SCM AC Magnetic Fields & Waves EFW Perp 2D Sensors DC Electric EMFISIS/MAG EFW Par 1D EMFISIS/Waves EFW EFW AC 3D EFW E-fld Spectra 2D AC Electric EMFISIS Waves EMFISIS Waves EMFISIS Density EFW cold plasma density Density ~DC 10Hz 1kHz 1MHz T HE U NIVERSITY OF I OWA 9 ICRBSW 2012 9
EMFISIS Components and Performance Triaxial Magnetometer (MAG): – vector B, DC-30 Hz; – 3 ranges: ± 256 nT, ± 4,096 nT and ± 65,536 nT with corresponding resolutions: ±0.008 nT, ±0.125 nT ±2nT Waves: – Magnetic field: vector B. 10 Hz-12 kHz and sensitivity: 3x10 -11 nT 2 Hz -1 @1 kHz. – Electric field : vector E from double probe experiment. 10 Hz-12 kHz (vector),\10-400 kHz (single channel) sensitivity: 3x10 -17 V 2 m -2 Hz -1 @ 1 kHz, EMFISIS data rate : 31.6 kbits/s . T HE U NIVERSITY OF I OWA 10 ICRBSW 2012 10
Data Taking Modes MAG – 64 vectors per second, always. Survey: ~0.5 s wave snapshot every six seconds: spectral matrix for 10 Hz -12 khZ and single electric field 10-400 kHz spectrum Burst waveform: steady, 3-E, 3-B waveforms. Storage up to 40 m of data, BUT, it takes 3 days to dump 30 ms mode: 30 ms resolution, somewhat limited spectral range, full spectral matrices. Total capacity: ~1.5 hours, BUT, 3 days to dump Burst triiggers: – Deterministic, location driven – Event driven: wave power, B change T HE U NIVERSITY OF I OWA 11 ICRBSW 2012 11
Survey Data Products HFR-spectra-merged Single axis spectra (selectable axis: Eu, Ev, Ew) 10 kHz to 400 kHz 1 spectra every 6 seconds plus 1 spectra every 0.5 seconds when fast survey is active. WFR-spectra-lite E-Total, B-Total, (Eu, Ev, Ew), (Bu, Bv, Bw). 4 Hz to 12 kHz 1 matrix every 6 seconds plus 1 spectra every second when fast survey is active. WFR-spectral-matrix merged Full spectral matrix from the two vector measurements (E and B) 4 Hz to 12 kHz 1 matrix every 6 seconds plus 1 spectra every second when fast survey is active. Mag-uvw] _emfisis_L1b 64 vectors a second (unless in failsafe mode then 1 vector per second) Quicklook - calibrations not verified! Not for use in scientific analysis. Mag-uvw_emfisis_L2 64 vectors a second in uvw coordinate system Includes any boom alignment adjustments T HE U NIVERSITY OF I OWA 12 ICRBSW 2012 12
Burst Data Products & Access Burst waveforms Full 3-axis E and 3-axis B 35,000 ksamples/s ~ 6 s duration, repeatable with small gap 30 ms mode Full spectral matrix from both vector measurements (E and B) 0.1 f ce to 0.7 f ce 1 matrix every 30 ms from 1024 samples All data accessible using Autoplot EMFISIS web page: http://emfisis.physics.uiowa.edu/ T HE U NIVERSITY OF I OWA 13 ICRBSW 2012 13
Space Weather Data Products MAG 1 vector every 12 s in spinning UVW coordinates Spectral bands 1 set of 5 bands every 12 s – B tot autospectra from 0.1 f ce to 0.5 f ce – E tot autospectra from 0.1 f ce to 0.5 f ce – B tot autospectra from 0.5 f ce to 0.7 f ce – E tot autospectra from 0.5 f ce to 0.7 f ce – B tot autospectra from 10 Hz to f ce – E tot autospectra from 10 Hz to f ce T HE U NIVERSITY OF I OWA 14 ICRBSW 2012 14
Flight Sensors MAG and MSC sensors fully tested and integrated on the spacecraft. T HE U NIVERSITY OF I OWA 15 ICRBSW 2012 15
Status Spacecraft are Kennedy Space Center. All instruments and subsystems installed Final full system testing starts beginning of June. Final Swing Test will verify clean spacecraft T HE U NIVERSITY OF I OWA 16 ICRBSW 2012 16
Conclusions Need for wave parameters is key for constraining models and understanding wave-particle interactions. EMFISIS provides full vector E and vector B over the VLF range gives us the ability to determine key wave propagation parameters. Upper hybrid gives us good density measurement. Space weather broadcast gives key parameters immediately. RBSP provides the needed set of measurements to advance our understanding of wave generation mechanisms and particle acceleration models. T HE U NIVERSITY OF I OWA 17 ICRBSW 2012 17
That’s all folks! T HE U NIVERSITY OF I OWA 18 ICRBSW 2012 18
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