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Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission

Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission. Particles and Fields Operations Critical Design Review May 23 -25, 2011 Dave Mitchell SWEA Lead. The Particles and Fields Package. LPW- EUV. SWIA. LPW. SWEA. MAG. SEP (sunward FOV not shown). MAG. STATIC.

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Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission

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  1. Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission Particles and Fields Operations Critical Design Review May 23 -25, 2011 Dave Mitchell SWEA Lead

  2. The Particles and Fields Package LPW- EUV SWIA LPW SWEA MAG SEP (sunward FOV not shown) MAG STATIC Solar Wind Ion Analyzer (SWIA) - SSL Solar Wind Electron Analyzer (SWEA) – CESR / SSL Langmuir Probe and Waves (LPW) – LASP / SSL Plus Extreme Ultra-Violet (LPW-EUV) - LASP Solar Energetic Particle Detector (SEP) - SSL Magnetometer (MAG) – GSFC Supra-Thermal and Thermal Ion Composition (STATIC) - SSL

  3. APP Instruments +i is in the NGIMS Boresight Direction +j is in the main IUVS Boresight Direction +k defined to be a right-handed coordinate system Inner Gimbal SC +y Outer Gimbal i k • Inner gimbal rotates about spacecraft body y axis • Outer gimbal rotates about APP j axis STATIC j

  4. Cruise Phase Activities

  5. Transition Phase Activities

  6. Science Phase: Day in the Life LPW-EUV occultations

  7. Coverage of the Mars Environment Periapsis Pass 1000 sheath 600 pileup ionosphere 300 exobase deep dip homopause 100 120 130 140 150 Minutes S/C Slew

  8. Spacecraft Pointing Modes Periapsis Modes Sun-Velocity +Z  Sun; +X  Nadir Fly-Y +/- Y  Ram; +X  Nadir Aerostable -Z  Ram; +X  Nadir Side Segment Modes Sun-Nadir (STATIC-Priority) +Z  Sun; +X  Nadir Sun-Inertial (IUVS-Priority) +Z  Sun; +X  Semi-minor axis Apoapsis Mode Sun-Inertial +Z  Sun; +X  Semi-major axis Z Y X

  9. APP Pointing Modes (STATIC) Side Segments Periapsis Segments Sun Ram RAM-NADIR SUN-NADIR 90O X 360O FOV Nadir Nadir Ram 180° STATIC Scans RAM-HORIZONTAL (Fly-Y Only) Nadir

  10. Science Orbit Scenarios From Design Reference Mission (MAVEN-SC-PLAN-0005) No STATIC Sun-Nadir

  11. Science Phase Timeline

  12. Impact of Orbit Scenarios on PFP • STATIC • Periapsis: Significant improvement since PDR (ram-nadir and ram-horizontal observations, APP scan every other orbit) • Mid-altitudes: Time sharing with IUVS, minimize use of scenarios 4 and 5 (CCR in system to reduce these from 14 weeks to ~2 weeks) • Apoapsis: Ride-along during IUVS disk mapping (same as PDR) • SWEA • Periapsis: high energy resolution not available in Fly-Y mode (~50% of orbits)  still meets Level 3 requirements • No issues at higher altitudes. • SWIA, SEP, MAG, LPW/EUV • No issues.

  13. PF Instrument Operations S/C Attitude Inertial Point Inertial Point Sun-V Fly-Y slew slew slew slew APP Mode Sun-Nadir (STATIC priority) Sun-Nadir (STATIC priority) RAM-N RAM-H Fixed Fixed M M H L L LPW EUV Solar Monitor M M H L SEP L MAG H L L SWIA Solar Wind and Magnetosheath Modes (internally triggered) Iono Mode SWEA Solar Wind Mode Solar Wind Mode STATIC C C Pickup Ions & Magnetosheath RAM Pickup Ions & Magnetosheath 5600 6200 500 500 5600 Spacecraft Altitude (km) 0 45 90 135 180 225 270 Time Since Apoapsis (min) Key: H/M/L = high/medium/low data rates; C = ion conics and outflow Standard Orbit Sun/Nadir Point Sun/Nadir Point

  14. PF Instrument Operations Deep Dip Orbit S/C Attitude Inertial Point Sun/Nadir Point Sun/Nadir Point Inertial Point RAM slew slew slew slew APP Mode Sun-Nadir (STATIC priority) Sun-Nadir (STATIC priority) RAM Track Fixed Fixed M M H L L LPW EUV Solar Monitor M M H L SEP L MAG H L L SWIA HV Off Solar Wind / Magnetosheath Modes Solar Wind / Magnetosheath Modes SWEA HV Off Solar Wind Mode Solar Wind Mode STATIC Pickup Ions & Magnetosheath HV Off C Pickup Ions & Magnetosheath C 5600 6200 500 500 5600 Spacecraft Altitude (km) 0 45 90 135 180 225 270 Time Since Apoapsis (min) Key: H/M/L = high/medium/low data rates; C = ion conics and outflow, HV Off at pressure > 10-5 torr

  15. PF Instrument Operations

  16. Ground Data System

  17. PF Commanding The SOC generates routine command scripts to run the PF instruments based on parameterized inputs from the PF team orbit phased mode changes altitude based rules eclipse based rules spacecraft orientation based rules instrument safing commands high voltage off during deep dips close SEP attenuator when Sun in FOV close EUV shutter when viewing the RAM direction at periapsis The PF team generates non-interactive commands and sends to the SOC for upload Regular commands to select Archive data for downlink Occasional parameter change commands to adjust the instruments

  18. PF Archive Data • PF instruments (except LPW) send uncompressed data to the PFDPU • Compression in PFDPU reduces this volume by factor of ~2 • Standard data products  Survey Data • High resolution data products  Archive Data • Archive data • Stored in 8 GB flash memory within PFDPU • At ~30 kbps, memory can hold 2-3 weeks of Archive Data • About 10% of Archive data can be sent down in telemetry • Downlinks occur twice per week • Survey data (Quicklook) are reviewed after each downlink • Time ranges of interest are selected • Commands are generated to instruct PFDPU to place selected Archive data into telemetry at next available downlink • Commands sent to SOC for upload

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