Stuart D. BaleFIELDS iPDR – Science Requirements Solar Probe Plus FIELDS Instrument PDR Science and Instrument Overview Science Requirements Stuart D.

SPP-FIELDS

Solar Probe Plus FIELDSInstrument PDR

Science and Instrument OverviewScience Requirements

Stuart D. BaleFIELDS Principal InvestigatorUniversity of California, [email protected] D. BaleFIELDS iPDR Science RequirementsOutline2Overview and Requirements

SPP/FIELDS Science RequirementsFIELDS SciencePlasma environment of the inner heliosphereInstrument Level-1 Requirements

Instrument Concept and Block DiagramMeasurements ConceptBlock DiagramCONOPS Overview

The FIELDS Team

Stuart D. BaleFIELDS iPDR Science RequirementsFIELDS Top Level DescriptionThe SPP/FIELDS experiment will measure directly:

DC/Low Frequency Electric FieldsDC/Low Frequency Magnetic FieldsPlasma wave (E and B) waveforms, spectra, and cross-spectraSpacecraft floating potentialSolar and interplanetary radio (e/m) emissions

and by analysis:

Perpendicular electron velocity and its spectrumVery accurate electron density and temperatureRapid (~kHz) density fluctuations and spectrumVoltage signatures of interplanetary dust

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FIELDS Science ObjectivesTrace the flow of energy that heats and accelerates the solar corona and solar windFIELDS will measure:Alfven waves and Poynting (energy) fluxTurbulent cascade and dissipationCompressive waves and cyclotron dampingMagnetic reconnection and collisionless shocksVelocity-space (expansion) instabilitiesSignatures of ambipolar/IP potentialOutwardwavesInwardwaves

(Alfven waves in SDO/AIA - McIntosh et al., 2011)4Stuart D. BaleFIELDS iPDR Science Requirements4Determine the structure and dynamics of the plasma and magnetic fields at the sources of the solar windFIELDS will measure:Magnetic field polarity and flux tube structureReconnection current sheetsStatistics of (Parker) nano-/micro-flaresStreamer belt reconnectionStreamer belt latitudinal extent

Parker micro-flares will appear like a type III radio storm against the galactic background5FIELDS Science ObjectivesStuart D. BaleFIELDS iPDR Science Requirements5Determine the structure and dynamics of the plasma and magnetic fields at the sources of the solar windFIELDS will measure:The plasma density to ~1-2% accuracy over the science orbitThe 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!6FIELDS Science ObjectivesStuart D. BaleFIELDS iPDR Science Requirements6Explore mechanisms that accelerate and transport energetic particles

FIELDS will measure:Interplanetary shocksType II and type III radio burstsSolar wind magnetic reconnectionStochastic (turbulent) acceleration

> 0.1G> 1VSPP/FIELDS will see very large electric and magnetic fields and compressions: ~1+ V and ~1000+ nT at strong shocks1 AU9.5 Rs7FIELDS Science ObjectivesStuart D. BaleFIELDS iPDR Science Requirements78FIELDS Plasma EnvironmentFIELDS makes rapidmeasurements of intense fields

High cadence samplingBurst memory systemFloating voltage preampsLarge dynamic range

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FIELDS Electric Field Measurements9Stuart D. BaleFIELDS iPDR Science Requirements9Change burst 1 to fast survey

FIELDS Magnetic Field Measurements10Stuart D. BaleFIELDS iPDR Science Requirements10FIELDS Level-1 Requirements11Table 4.1 Baseline Fields and Waves MeasurementsReq.MeasurementDynamic RangeCadenceBandwidth4.1.1.1Magnetic Field140dB100k vectors/sDC - 50kHz4.1.1.2Electric Field140dB2M vectors/sDC - 1MHz4.1.1.3Plasma Waves140dB1 spectrum/s~5Hz - 1MHz4.1.1.4QTN/Radio100dB for QTN80dB for radio1 spectrum/4s QTN1 spectrum/16s radio10-2,500kHz QTN1-16MHz radioTable 4.5 Threshold Fields and Waves MeasurementsReq.MeasurementDynamic RangeCadenceBandwidth4.1.2.3Magnetic Field125dB256 vectors/sDC - 128Hz4.1.2.4Electric Field125dB256 vectors/sDC - 128Hz4.1.2.5Plasma Waves90dB1 spectrum/10s~5Hz - 50kHz4.1.2.6QTN/Radio70dB for QTN70dB for radio1 spectrum/32s QTN1 spectrum/32s radio10-2,500kHz QTN1-16MHz radioLevel-1 Requirements Flow to FIELDSStuart D. BaleFIELDS iPDR Science RequirementsDC/LF Electric Field Measurements12

Stuart D. BaleFIELDS iPDR Science RequirementsThe FIELDS Sensors13

V1-V4 electric antennasMAGi, MAGoV5 electric antennaSCMV1-V4 electric antennas- Five voltage sensors- Two Fluxgate magnetometers- One search-coil magnetometer- Main Electronics PackageStuart D. BaleFIELDS iPDR Science Requirements

FIELDS Electric Antenna Design14Spacecraft 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 preamplifierStuart D. BaleFIELDS iPDR Science RequirementsFIELDS Block Diagram15

FIELDS System

Two SidesEach has Spacecraft I/FEach has MagnetometerEach has Antenna Elect.Each has Power Supply

FIELDS1 also hasRadio Freq Spect.Digital Fields BoardSCM Calib ControlAbsolute Time SequencerTDS I/F

FIELDS2 also hasTime Domain SamplerDCB I/FSWEAP I/F

Stuart D. BaleFIELDS iPDR Science RequirementsThe FIELDS Instrument Team16

Stuart D. BaleFIELDS iPDR Science Requirements Day 1 Agenda17

Stuart D. BaleFIELDS iPDR Science RequirementsDay 2 Agenda18ftp://apollo.ssl.berkeley.edu/pub/FIELDS/1_Management/1.7_Meetings/PhaseB_20131113_iPDR/Presentations/

All presentations are available at the following URL:

Stuart D. BaleFIELDS iPDR Science Requirements