IBEX Science Operations Center ISOC Status

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SWT
IBEX Science Operations Center (ISOC) --
Status Nathan A. Schwadron
Southwest Research Institute3/9/09
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Orbit Orientation Good for Science
Apr 1

• Good orientation for Global ENA maps
• Hole from magnetospheric obscuration opposite the
  line of apsides (apogee to Earth)
• Good orientation for Interstellar Oxygen and
  Helium measurements
• From day 10-60 (spring viewing)
• From day 255 - 290 (fall viewing)
• The orbit orientation is a change from planned
  launch during Summer 08

Int. Flow Vector
Jan 1
July 1
Oct 1
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IBEX Trajectory
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Apogee Perigee Altitudes
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View time per Pixel for 2 year Mission
Reduction in view time due to magnetosphere
obscuration
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IBEX Doses

• Perigee optimized (higher perigee altitude) for
  lower doses

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ISOC Computing Hardware

• All Computers Up and Running
• BU RAID had some problems
• The RAID has been replaced and is currently being
  configured
• Considering a Hot Swap solution at BU

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Data Flow
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ISOC to MOC Interface

• Secure ftp connection to MOC has been stable
• No problems in retrieving data from the MOC
• Science Tasking Files have been extremely useful
  and successful
• Fairly automated facility for generating and
  incorporating special payload commands

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Data Product Foundation Science Telemetry Types
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Data Product Hierarchy
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Archiving and Distribution

• ISOC (BU)
• Telemetry Archive ?
• Housekeeping Archive ?
• Science Archive with web distribution ?
• Mirrored Archives at SwRI ?
• SPDF and NSSDC
• Level 1,2 to SPDF
• Validated Level 0-2 data for permanent archive
• Virtual Heliospheric Observatory (VHO)

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ISOC Security

• No programmatic risks associated with Science
• No Security Issues have arisen

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Backup Systems

• Currently 7 Complete IBEX Data Sets on 5 Machines
  at 3 Separate Locations
• BU ISOC mirrored at SwRI
• RAID system mirrored at each site
• One RAID recently replaced and under
  configuration
• BU system backed up internally on a weekly basis
  (BU Information and Technology Center)
• We are reassessing which drives are backed up
• SwRI system backed on a weekly basis
• Computers under warrantee (3 years)

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ISOC SW Development

• Point Release of Build 3 at Launch - Done
• S/W Build 4 (Mission Rehearsal 3) - Done
• Refinement of software
• Additional tools for housekeeping data
• S/W Build 5 (Half Sky Map)
• 3 Months of Science Data, currently in work
• S/W Build 6 (Full Sky Map) - 6 Months of Science
  Data

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PLFW Status

• PLFW fully Designed, Integrated Tested
• ISOC Testing of PLFW Complete
• 8-day exercise revealed no significant PLFW
  anomalies
• Build 5.1 loaded to Spacecraft June 12, 2008
• Adds 15 Margin
• Build 6.0 (30 Margin) Designed and Tested
• To be used only if required
• Currently Considering Software Change To Optimize
  Science from IBEX-Lo Direct Events
• Macros uploaded (early Jan) that allow more
  flexibility in IBEX-Hi and IBEX-Lo Operation
• The sensors are now brought up independently and
  IBEX-Hi collimator voltages can be reduced when
  in the quiet solar wind

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Science Software Development

• Development currently through Level 3.3
• Intense focus currently on
• web tools
• plotting software
• new capabilities for event sorting
• Software for global maps

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Changes as a Result of Commissioning

• IBEX-Lo uses only its negative collimator in a
  much lower setting (-400 V)
• Lo ascending macro (HVSCI) occurs well after
  IBEX-Hi ascending macro
• IBEX-Lo has a large number of electron counts
• Software change to prevent electron counts from
  swamping the telemetry
• IBEX-Hi collimator voltages lowered in solar wind
  to prevent the solar wind from entering the
  instrument
• Change to the operation plan to trigger a
  transition from higher to lower collimator
  voltages
• ACS Software updated to fix problems with Spin
  Pulse Timing

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Trending and Housekeeping

• A set of trending and housekeeping plots have
  been developed
• Trending data posted weekly by C. Prested
• PL Teams, CEU Team Review Data and Provide
  Feedback
• All systems nominal

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The Solar Wind Background (1/3)

• Deflected Solar Wind Incident on the IBEX-Hi
  Sensor creates a sizable background

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The Solar Wind Background (2/3)

• SW background highly correlated to the SW
  deflection angles

Double Triples
Deflection y
Deflection z
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The Solar Wind Background (3/3)

• Correspondence between incident solar wind flux
  and ena rate

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Strategy for Map Making

• Identify periods of low background in each orbit
  for IBEX-Lo and IBEX-Hi
• Paul Janzen keeper of the IBEX-Hi list
• David Heirtzler keeper of the IBEX-Lo list
• Subtract out a realtively constant background in
  IBEX-Hi
• 0.057 Hz
• Correct for
• Moving SC frame
• ENA deflection by radiation pressure
• ENA loss through Ionization
• ENA energy change through heliospheric
  transmission

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ESA Step 1
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ESA Step 2
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ESA Step 3
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ESA Step 4
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ESA Step 5
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ESA Step 6
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Nose vs Tail
Nose
Tail
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North vs South

• South

North
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A quick comparison
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Conclusions

• Science Operations are going well!
• Recovering First Maps Energy Distributions

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Energy Distribution Mapping
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Acronyms

• BU - Boston University
• Cal - Calibration
• CEU - Central Electronics Unit
• CPT - Comprehensive Performance Test
• CRaTER - Cosmic Ray Telescope for Effects of
  Radiation
• Def. - Define
• Dict - Dictionary
• Dutils - Data Utilities
• DE - Direct Event
• ENA - Energetic Neutral Atom
• H/K - Housekeeping
• I/F - Interface
• ISOC - IBEX Science Operations Center
• LANL - Los Alamos National Lab
• LMATC - Lockheed Martin Advanced Technology Center

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Acronyms

• ME - Meta Event
• MOC - Mission Operations Center
• NSSDC - National Space Science Data Center
• P/L - Payload
• PLFW - Payload Firmware
• S/C - Spacecraft
• SCB - Spacecraft Bust
• SOC - Science Operations Center
• SPDF - Space Physics Data Facility
• SwRI - Southwest Research Institute
• SW - Software
• Tlm - Telemetry
• VHO - Cirtual Heliospheric Observatory

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BACKUP
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PLFW LUT Upload Testing

• PLFW and LUT has been successfully uploaded onto
  the Spacecraft and FlatSat on several occasions
  with no issues
• MOC procedures for PLFW LUT in-flight upload
  have been run with designated flight controller
  personnel awaiting final release
• Spacecraft Uploads
• Build 5.1 associated LUT successfully uploaded
  into CEU EEPROM 6/11-12/08 and verified by CPT
• Additional run time on S/C 7/17/08
• Successful upload of PLFW partial LUT into SRAM
  as part of CEU LV Commissioning Procedure
• FlatSat Uploads
• Pre-Build 5.1 Installation on S/C
• Mission Rehearsal 2 6/17/08
• Additional run time on FlatSat (ongoing)

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PLFW LUT Upload Testing

• Spacecraft Uploads
• Build 5.1 Installation 6/11-12/08
• Build 5.1 associated LUT successfully uploaded
  into S/C EEPROM
• Upload verified by P/L CPT (TP6205_A), LVSCI test
  applicable part of ACS (TP4630) CDH CPT
• Additional Runtime on S/C 7/17/08
• Build 4.0 partial LUT successfully uploaded
  into SRAM (S924-31801_A CEU LV Commissioning
  Procedure)
• FlatSat Uploads
• Pre-Build 5.1 Installation on S/C
• Build 5.1 LUT upload performed first on FlatSat
• Upload verified by P/L CPT (TP6205_A), LVSCI test
  applicable part of ACS (TP4630) CDH CPT
• Mission Rehearsal 2 6/17/08
• Build 4.0 partial LUT successfully uploaded
  into SRAM (S924-31801_A CEU LV Commissioning
  Procedure)
• Additional Runtime on FlatSat (ongoing)
• Many pre-MR2 iterations of upload into SRAM with
  CEU team, Flight Director both Flight
  Controllers during Friday procedure walkthroughs
  from MOC (S924-31801_A CEU LV Commissioning
  Procedure)
• Build 5.1 Upload additional testing with Flight
  Controller for procedure release
• Partial LUT Upload testing with Flight Controller
  for procedure release

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ISOC Elements

• SwRI Mirror ISOC
• SOC Computer Mirrors
• RAID Array
• Maestro Station, GSEOS Laptops
• Hardware at SwRI
• SCB Sim (3'x2'x4')
• CEU Sim
• IBEX-Hi Sim
• IBEX-Lo Sim

• BU ISOC
• SOC Computers
• RAID Array
• Web Server
• BU Facilities
• Secure Computer Room
• ISOC Center Lab
• Undergraduate Area

All facilities up and running
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Configuration Control

• All Software is under Subversion (SVN) control 
• Use process for capturing and regression testing
  releases
• Releases can be patched or new releases rolled
  out  
• All the data analysis carried out with reference
  to a specific software release
• Results under one release can be
  directly compared with other releases
• All telemetry data is captured with cryptographic
  checksums   and processing starts
• Difficult if not impossible to hack the data
• Data and processing are duplicated at 2 sites (BU
  SwRI) far enough apart to withstand disasters

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Global Forward Mapping
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Energy Distribution Mapping
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Global Forward Mapping