International Forum for Space Weather Capabilities Assessment

Forum Home | Working Teams & Topics |  Overall Goals and Deliverables  | Sign Up | FAQ |  ICCMC-LWS Working Meeting & Presentations 
Neutral Density and Orbit Determination at LEO

Related Links | Frequently Asked Questions | Community Feedback | Downloads | Sitemap
CCMC Home | CCMC Stakeholders | Our Team | Publications | Meetings and Workshops | Concept of Operations
Models At A Glance | ModelWeb Catalog and Archive
Request Procedures | Generate Input Data Files & Parameters | Movies on Request | About the Run Process | Publications Policy
Search run database | Request run output | Special events | Kameleon Software | Space Weather Explorer | Publications policy
Instant Model Run
Forecasting Support tools | iSWA | DONKI | Mission Support | Experimental Real Time Simulations | Operational Geospace Model Validations
Intl Forum | GEM Challenge | CEDAR ETI Challenge | GEM-CEDAR Challenge | SHINE Challenge | CME Arrival Time Scoreboard | Flare Scoreboard | SEP Scoreboard | IMF Bz Scoreboard
Educational materials &activities | Space Weather REDI Initiative | SW REDI Bootcamp | Student Research Contest | Tutorial at CEDAR | Forecaster Tools
Missions near Earth/in Earth-orbit | MMS | Van Allen Probes | THEMIS | MESSENGER | STEREO | Spitzer | MAVEN | MSL | Dawn | Kepler | EPOXI | Juno | CASSINI | Voyager | New Horizons | Sounding Rockets | International
Research Community Support | CCMC Workshops | NASA Robotic Mission Operator Workshops | LWS Support | Exo-CCMC | DREAM2 Support | HELCATS Support
iSWA | DONKI | Kameleon | StereoCat | EEGGL | CME Scoreboard | SEP Scoreboard | FLR Scoreboard | SEA5

Neutral Density and Orbit Determination at LEO Working Team

Team Leads: S. Solomon* (Primary lead, UCAR HAO), T. Fuller-Rowell* (NOAA/SWPC), S. Bruinsma*(CNES), E. Sutton* (AFRL) (email team leads to be added to the team)

Participants and Followers: List of participants and followers (as of November 2, 2017)
Communications: ccmc-neutral-density@googlegroups.com (mailing list)


Latest News
Summary of ionosphere working team discussions at April 2017 working meeting
Presentations and Discussions from the 2017 working meeting


User Needs

  • Prediction of atmospheric density to minimize drag errors in orbit determination (OD) and propagation for purposes of collision avoidance or re-entry predictions
  • Model uncertainty information that can be formulated into correction matrices to the OD-produced covariances in order to represent the atmospheric density model errors properly


Working Team Goals

  • Establish metrics agreed upon by the community
  • Evaluate where we stand with atmospheric density prediction
  • Provide a benchmark against which future models can be assessed against


Working Team Deliverables


Physical Quantities and Metrics for Model-Data Comparison

    Neutral density in the altitude range 200 – 800 km:
  • Daily mean
  • Orbit averaged
  • Model sampled at satellite locations, binned 5° along track
  • Global mean (J. Emmert: global daily mean of TLE-inferred densities)
  • Mean, standard deviation, and RMS of observed-to-modeled density ratios, as well as correlation coefficient
    Orbits of LEO satellites


Available Data Sources

  • Accelerometer/GPS measurements by CHAMP/GRACE/GOCE/SWARM
  • Global mean neutral density survey by J. Emmert
  • Daily mean density at 800km from Starlette and Stella
  • Standard versions to be provided by E. Doornbos, S. Bruinsma, and J. Emmert
  • POE (Precise Orbit Ephemeris):
    - Aqua/Aura/Terra provided by NASA FDF
    - Cryosat-2/Sentinels at 800 km,
    - Tandem/TerraSAR-X at 500 km to be provided by S. Bruinsma


Participating Models
Please contact the team leads for additional model suggestions

  • Empirical Models: JB2008, DTM, NRLMSISE-00
  • Numerical Models: CTIPe, TIE-GCM, GITM


List of Time Intervals


Resources and Past Progress
Time series plotting tool
Presentations/Publications from previous assessments of neutral density prediction
Runs for metric studies performed at the CCMC
CEDAR-ETI and GEM Challenge Events (draft)
GEM-CEDAR Challenge Events (draft)
Time intervals for Orbit Determination (draft)


<< Return to the forum homepage

National Aeronautics and Space Administration Air Force Materiel Command Air Force Office of Scientific Research Air Force Research Laboratory Air Force Weather Agency NOAA Space Environment Center National Science Foundation Office of Naval Research

| | Privacy, Security Notices

CCMC logo designed by artist Nana Bagdavadze