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Solar Probe Plus FIELDS Instrument PDR Science and Instrument Overview Science Requirements

Solar Probe Plus FIELDS Instrument PDR Science and Instrument Overview Science Requirements. Stuart D. Bale FIELDS Principal Investigator University of California, Berkeley bale@ssl.berkeley.edu. Outline. Overview and Requirements SPP/FIELDS Science Requirements FIELDS Science

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Solar Probe Plus FIELDS Instrument PDR Science and Instrument Overview Science Requirements

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  1. Solar Probe Plus FIELDSInstrument PDRScience and Instrument OverviewScience Requirements Stuart D. Bale FIELDS Principal Investigator University of California, Berkeley bale@ssl.berkeley.edu

  2. Outline • 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

  3. FIELDS Top Level Description The SPP/FIELDS experiment will measure directly: • DC/Low Frequency Electric Fields • DC/Low Frequency Magnetic Fields • Plasma wave (E and B) waveforms, spectra, and cross-spectra • Spacecraft floating potential • Solar and interplanetary radio (e/m) emissions • …and by analysis: • Perpendicular electron velocity and its spectrum • Very accurate electron density and temperature • Rapid (~kHz) density fluctuations and spectrum • Voltage signatures of interplanetary dust

  4. FIELDS Science Objectives • “Trace the flow of energy that heats and accelerates the solar corona and solar wind” FIELDS will measure: • Alfven waves and Poynting (energy) flux • Turbulent cascade and dissipation • Compressive waves and cyclotron damping • Magnetic reconnection and collisionless shocks • Velocity-space (expansion) instabilities • Signatures of ambipolar/IP potential Outward waves Inward waves (Alfven waves in SDO/AIA - McIntosh et al., 2011)

  5. FIELDS Science Objectives • “Determine the structure and dynamics of the plasma and magnetic fields at the sources of the solar wind” FIELDS will measure: • Magnetic field polarity and flux tube structure • Reconnection current sheets • Statistics of (Parker) nano-/micro-flares • Streamer belt reconnection • Streamer belt latitudinal extent Parker micro-flares will appear like a ‘type III radio storm’ against the galactic background

  6. FIELDS Science Objectives • “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 • “Explore mechanisms that accelerate and transport energetic particles” FIELDS will measure: • Interplanetary shocks • Type II and type III radio bursts • Solar wind magnetic reconnection • Stochastic (turbulent) acceleration > 1V 9.5 Rs > 0.1G SPP/FIELDS will see very large electric and magnetic fields and compressions: ~1+ V and ~1000+ nT at strong shocks 1 AU

  8. FIELDS Plasma Environment • FIELDS makes rapid • measurements of intense fields • High cadence sampling • Burst memory system • Floating voltage preamps • Large dynamic range

  9. FIELDS Electric Field Measurements

  10. FIELDS Magnetic Field Measurements

  11. FIELDS Level-1 Requirements Level-1 Requirements Flow to FIELDS

  12. DC/LF Electric Field Measurements

  13. The FIELDS Sensors - Five voltage sensors - Two Fluxgate magnetometers - One search-coil magnetometer - Main Electronics Package V1-V4 electric antennas MAGi, MAGo SCM V1-V4 electric antennas V5 electric antenna

  14. FIELDS Electric Antenna Design FIELDS antenna ‘whip’ (200 cm – current-biased surface) FIELDS antenna heat-shield (voltage-biased surface) FIELDS antenna ‘stub’ (30 cm – voltage-biased surface) Spacecraft heat-shield (TPS) FIELDS preamplifier

  15. FIELDS Block Diagram • FIELDS System • Two Sides • Each has Spacecraft I/F • Each has Magnetometer • Each has Antenna Elect. • Each has Power Supply • FIELDS1 also has • Radio FreqSpect. • Digital Fields Board • SCM Calib Control • Absolute Time Sequencer • TDS I/F • FIELDS2 also has • Time Domain Sampler • DCB I/F • SWEAP I/F

  16. The FIELDS Instrument Team

  17. Day 1 Agenda

  18. Day 2 Agenda All presentations are available at the following URL: ftp://apollo.ssl.berkeley.edu/pub/FIELDS/1_Management/1.7_Meetings/PhaseB_20131113_iPDR/Presentations/

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