The Electric and Magnetic Field Instrument Suite and Integrated - - PowerPoint PPT Presentation

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The Electric and Magnetic Field Instrument Suite and Integrated - - PowerPoint PPT Presentation

Apr 07, 2023 373 likes •573 views

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

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The Electric and Magnetic Field Instrument Suite and Integrated Science

  • n the Radiation Belt Storm Probes
  • C. A. Kletzing

Department of Physics and Astronomy The University of Iowa craig-kletzing@uiowa.edu

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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.

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Key Wave Regions

Wave-particle interactions are involved in both acceleration and loss of radiation belt particles

Two identically instrumented satellites is a first!

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Radiation Belt Waves

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EMIC Waves

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Magnetosonic Equatorial Noise Signature

  • Santolik, 2004 analyzed 781 intvervalsof Cluster data
  • Limited to below 4 kHz
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RBSP Satellite Configuration

ECT REPT

EMFISIS MAG Boom

ECT MagEIS (Low 75 and Medium 75) ECT HOPE ECT MagEIS (High and Medium 35) RPS EFW Spin Plane Wire Boom (4x) EFW Axial Boom (fwd and aft) RB-Spice

EMFISIS Search Coil Boom

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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
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Fields Capabilities

DC Magnetic DC Electric AC Magnetic Density

EMFISIS FGM EFW Perp 2D EFW AC 3D EMFISIS Waves EMFISIS SCM

Fields & Waves Sensors EMFISIS/MAG EMFISIS/Waves EFW

~DC 10Hz 1kHz 1MHz

AC Electric

EFW Par 1D EFW E-fld Spectra 2D

EFW cold plasma density

EMFISIS Waves

EMFISIS Density

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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 nT2Hz-1 @1 kHz.

– Electric field:

  • vector E from double probe experiment.
  • 10 Hz-12 kHz (vector),\10-400 kHz (single channel)
  • sensitivity: 3x10-17 V2m-2Hz-1 @ 1 kHz,
  • EMFISIS data rate: 31.6 kbits/s.
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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

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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
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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 fce to 0.7 fce
  • 1 matrix every 30 ms from 1024 samples

All data accessible using Autoplot EMFISIS web page: http://emfisis.physics.uiowa.edu/

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Space Weather Data Products

MAG

  • 1 vector every 12 s in spinning UVW coordinates

Spectral bands

  • 1 set of 5 bands every 12 s

– Btot autospectra from 0.1 fce to 0.5 fce – Etot autospectra from 0.1 fce to 0.5 fce – Btot autospectra from 0.5 fce to 0.7 fce – Etot autospectra from 0.5 fce to 0.7 fce – Btot autospectra from 10 Hz to fce – Etot autospectra from 10 Hz to fce

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Flight Sensors

  • MAG and MSC sensors fully tested and integrated on

the spacecraft.

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Status

Final Swing Test will verify clean spacecraft

  • Spacecraft are Kennedy Space Center.
  • All instruments and subsystems installed
  • Final full system testing starts beginning of June.
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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.

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That’s all folks!