Stuart D. BaleFIELDS iCDR – Science Requirements Solar Probe Plus FIELDS Instrument CDR Science...
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Stuart D. Bale FIELDS iCDR – Science Requirements Solar Probe Plus FIELDS Instrument CDR Science and Instrument Overview Science Requirements Stuart D. Bale FIELDS Principal Investigator University of California, Berkeley [email protected]1
Stuart D. BaleFIELDS iCDR – Science Requirements Solar Probe Plus FIELDS Instrument CDR Science and Instrument Overview Science Requirements Stuart D
Stuart D. BaleFIELDS iCDR Science Requirements Solar Probe Plus
FIELDS Instrument CDR Science and Instrument Overview Science
Requirements Stuart D. Bale FIELDS Principal Investigator
University of California, Berkeley [email protected] 1
Slide 2
Stuart D. BaleFIELDS iCDR Science Requirements Outline 2
Overview and Requirements SPP/FIELDS Science Requirements FIELDS
Science Plasma environment of the inner heliosphere Instrument
Level-1 Requirements Instrument Concept and Block Diagram
Measurements Concept Block Diagram CONOPS Overview The FIELDS
Team
Slide 3
Stuart D. BaleFIELDS iCDR Science Requirements FIELDS at the
Mission Level 3
Slide 4
Stuart D. BaleFIELDS iCDR Science Requirements FIELDS Top Level
Description The SPP/FIELDS experiment will measure directly:
1.DC/Low Frequency Electric Fields 2.DC/Low Frequency Magnetic
Fields 3.Plasma wave (E and B) waveforms, spectra, and
cross-spectra 4.Spacecraft floating potential 5.Solar and
interplanetary radio (e/m) emissions and by analysis:
1.Perpendicular electron velocity and its spectrum 2.Very accurate
electron density and temperature 3.Rapid (~kHz) density
fluctuations and spectrum 4.Voltage signatures of interplanetary
dust 4
Slide 5
Stuart D. BaleFIELDS iCDR Science Requirements FIELDS Science
Objectives 1.Trace the flow of energy that heats and accelerates
the solar corona and solar wind FIELDS will measure : 1.Alfven
waves and Poynting (energy) flux 2.Turbulent cascade and
dissipation 3.Compressive waves and cyclotron damping 4.Magnetic
reconnection and collisionless shocks 5.Velocity-space (expansion)
instabilities 6.Signatures of ambipolar/IP potential Outward waves
Inward waves (Alfven waves in SDO/AIA - McIntosh et al., 2011)
5
Slide 6
Stuart D. BaleFIELDS iCDR Science Requirements 2.Determine the
structure and dynamics of the plasma and magnetic fields at the
sources of the solar wind FIELDS will measure : 1.Magnetic field
polarity and flux tube structure 2.Reconnection current sheets
3.Statistics of (Parker) nano-/micro-flares 4.Streamer belt
reconnection 5.Streamer belt latitudinal extent Parker micro-flares
will appear like a type III radio storm against the galactic
background 6 FIELDS Science Objectives
Slide 7
Stuart D. BaleFIELDS iCDR Science Requirements 2.Determine the
structure and dynamics of the plasma and magnetic fields at the
sources of the solar wind FIELDS will measure : -The plasma density
to ~1-2% accuracy over the science orbit -The core electron
temperature to ~5-10% accuracy over the science orbit Quasi-thermal
noise measurements of plasma parameters - antenna geometry is
critical - no s/c potential effects. This is good! 7 FIELDS Science
Objectives 10 Rs 35 Rs 55 Rs
Slide 8
Stuart D. BaleFIELDS iCDR Science Requirements 3.Explore
mechanisms that accelerate and transport energetic particles FIELDS
will measure: 1.Interplanetary shocks 2.Type II and type III radio
bursts 3.Solar wind magnetic reconnection 4.Stochastic (turbulent)
acceleration > 0.1G > 1V SPP/FIELDS will see very large
electric and magnetic fields and compressions: ~1+ V and ~1000+ nT
at strong shocks 1 AU 9.5 Rs 8 FIELDS Science Objectives
Slide 9
Stuart D. BaleFIELDS iCDR Science Requirements 9 FIELDS Plasma
Environment The Helios (0.29 AU) and remote sensing measurements
extrapolated into 10 Rs 9 Helios - Magnetic field - Velocity -
Proton density - Proton temperature Helios + models - Electron
temperature
Slide 10
Stuart D. BaleFIELDS iCDR Science Requirements 10 FIELDS Plasma
Environment - High cadence sampling -Burst memory system -Floating
voltage preamps -Large dynamic range 10
Slide 11
Stuart D. BaleFIELDS iCDR Science Requirements FIELDS Electric
Field Measurements 11
Slide 12
Stuart D. BaleFIELDS iCDR Science Requirements FIELDS cares
about EMC 12 RE02 spec requires controlled power supplies 150 kHz +
n*50kHz
Slide 13
Stuart D. BaleFIELDS iCDR Science Requirements FIELDS Magnetic
Field Measurements 13
Slide 14
Stuart D. BaleFIELDS iCDR Science Requirements FIELDS Level-1
Requirements 14 Table 4.1 Baseline Fields and Waves Measurements
Req.MeasurementDynamic RangeCadenceBandwidth 4.1.1.1Magnetic
Field140dB100k vectors/sDC - 50kHz 4.1.1.2Electric Field140dB2M
vectors/sDC - 1MHz 4.1.1.3Plasma Waves140dB1 spectrum/s~5Hz - 1MHz
4.1.1.4QTN/Radio 100dB for QTN 80dB for radio 1 spectrum/4s QTN 1
spectrum/16s radio 10-2,500kHz QTN 1-16MHz radio Table 4.5
Threshold Fields and Waves Measurements Req.MeasurementDynamic
RangeCadenceBandwidth 4.1.2.3Magnetic Field125dB256 vectors/sDC -
128Hz 4.1.2.4Electric Field125dB256 vectors/sDC - 128Hz
4.1.2.5Plasma Waves90dB1 spectrum/10s~5Hz - 50kHz 4.1.2.6QTN/Radio
70dB for QTN 70dB for radio 1 spectrum/32s QTN 1 spectrum/32s radio
10-2,500kHz QTN 1-16MHz radio Level-1 Requirements Flow to
FIELDS
Slide 15
Stuart D. BaleFIELDS iCDR Science Requirements DC/LF Electric
Field Measurements 15
Slide 16
Stuart D. BaleFIELDS iCDR Science Requirements Spacecraft
Plasma Wake! 16 Major dynamical electrostatic disturbances in the
(anti- ram) wake of the spacecraft Density fluctuations Electric
field fluctuations Plasma potential structure Electric field sensor
orientation is driven by wake physics
Slide 17
Stuart D. BaleFIELDS iCDR Science Requirements The FIELDS
Sensors 17 V1-V4 electric antennas MAGi, MAGo V5 electric antenna
SCM V1-V4 electric antennas - Five voltage sensors - Two Fluxgate
magnetometers - One search-coil magnetometer - Main Electronics
Package
Slide 18
Stuart D. BaleFIELDS iCDR Science Requirements V1-V4 electric
sensors 18 V2 V1 V4 V3 Base/Hinge and stub (30 cm) Whip (2 m
length) Mid-Mount Whip Release Tip fork
Slide 19
Stuart D. BaleFIELDS iCDR Science Requirements FIELDS Electric
Antenna Design 19 Spacecraft heat-shield (TPS) FIELDS antenna
heat-shield (voltage-biased surface) FIELDS antenna stub (30 cm
voltage-biased surface) FIELDS antenna whip (200 cm current-biased
surface) FIELDS preamplifier
Slide 20
Stuart D. BaleFIELDS iCDR Science Requirements Block Diagram 20
FIELDS System Two Sides Each has Spacecraft I/F Each has
Magnetometer Each has Antenna Elect. Each has Power Supply FIELDS1
also has Radio Freq Spect. Digital Fields Board SCM Calib Control
Absolute Time Sequencer TDS I/F FIELDS2 also has Time Domain
Sampler DCB I/F SWEAP I/F
Slide 21
Stuart D. BaleFIELDS iCDR Science Requirements The FIELDS
Instrument Team 21