stuart d. balefields soc cdr science requirements solar probe plus fields soc cdr science and...

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Stuart D. Bale FIELDS SOC CDR – Science Requirements Solar Probe Plus FIELDS SOC CDR Science and Instrument Overview Science Requirements Stuart D. Bale FIELDS Principal Investigator University of California, Berkeley [email protected] 1

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Stuart D. BaleFIELDS SOC CDR – Science Requirements FIELDS at the Mission Level… 3

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Stuart D. BaleFIELDS SOC CDR Science Requirements Solar Probe Plus FIELDS SOC CDR Science and Instrument Overview Science Requirements Stuart D. Bale FIELDS Principal Investigator University of California, Berkeley 1 Stuart D. BaleFIELDS SOC CDR Science Requirements Outline 2 Overview and Requirements SPP/FIELDS Science Requirements FIELDS Science Plasma environment of the inner heliosphere Instrument Level-1 Requirements Stuart D. BaleFIELDS SOC CDR Science Requirements FIELDS at the Mission Level 3 Stuart D. BaleFIELDS SOC CDR 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 Stuart D. BaleFIELDS SOC CDR 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 Stuart D. BaleFIELDS SOC CDR 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 Stuart D. BaleFIELDS SOC CDR 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 Stuart D. BaleFIELDS SOC CDR 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 Stuart D. BaleFIELDS SOC CDR 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 Stuart D. BaleFIELDS SOC CDR Science Requirements 10 FIELDS Plasma Environment - High cadence sampling -Burst memory system -Floating voltage preamps -Large dynamic range 10 Stuart D. BaleFIELDS SOC CDR Science Requirements FIELDS Electric Field Measurements 11 Stuart D. BaleFIELDS SOC CDR Science Requirements FIELDS Magnetic Field Measurements 12 Stuart D. BaleFIELDS SOC CDR Science Requirements FIELDS Level-1 Requirements 13 Table 4.1 Baseline Fields and Waves Measurements Req.MeasurementDynamic RangeCadenceBandwidth Magnetic Field140dB100k vectors/sDC - 50kHz Electric Field140dB2M vectors/sDC - 1MHz Plasma Waves140dB1 spectrum/s~5Hz - 1MHz QTN/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 Magnetic Field125dB256 vectors/sDC - 128Hz Electric Field125dB256 vectors/sDC - 128Hz Plasma Waves90dB1 spectrum/10s~5Hz - 50kHz QTN/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 Stuart D. BaleFIELDS SOC CDR Science Requirements end 14