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Neutral Density Variations in Southern Auroral Oval Study

Explore neutral density variations within the southern auroral oval using satellite decay data. Analysis of high eccentricity satellite orbits reveals storm period patterns and implications for lower thermosphere density variations.

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Neutral Density Variations in Southern Auroral Oval Study

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  1. Neutral Density Variations Within the Southern Auroral Oval Bruce R Bowman HQ AFSPC/A9AC DOD Distribution A Approved for public release Distribution unlimited

  2. Acknowledgement I would like to thank Janet Green of the Space Weather Prediction Center for providing the NOAA/POES space environment monitoring data from the NOAA satellites.

  3. Introduction • Decay of high eccentricity satellite 16125 with perigee location in the southern hemisphere • Neutral density variations during pre-storm period • Neutral density variations during storm period • Southern auroral oval variations during storm period • Conclusions

  4. Last 20 Days of Orbital Decay

  5. Orbital Drag at Perigee

  6. Orbit Perigee Location

  7. Storm Indices ap and Dst Prior to Orbit Decay

  8. HALO CME C3

  9. Pre-Storm Density Variations by Time

  10. Pre-Storm Density Variations by Longitude

  11. Day 042 Pre-Storm Perigee Passage 270° 180° 0° ω 90°

  12. Storm Density Variations by Time

  13. Storm Density Variations by Longitude

  14. Day 044/2243 UT - Density High 270° 270° 180° 180° 0° 0° ω 90° 90°

  15. Day 045/0544 UT - Density High 270° 270° ω 180° 180° 0° 0° 90° 90°

  16. Day 045/ 2318 UT - Density High 270° 270° 180° 180° 0° 0° ω 90° 90°

  17. Day 046/ 0614 UT - Density High 270° 270° ω 180° 180° 0° 0° 90° 90°

  18. Day 045/ 1617 UT - Density Low 270° 270° 180° 180° 0° 0° ω 90° 90°

  19. Day 046/ 1451 UT - Density Low 270° 270° ω 180° 180° 0° 0° 90° 90°

  20. Day 047/ 1442 UT - Density Low 270° 270° ω 180° 180° 0° 0° 90° 90°

  21. Day 048 End of Storm Perigee Passage 270° 180° 0° ω 90°

  22. Storm Density Variations

  23. Storm Response Summary • Density response shows no more than 2hr lag from storm commencement • ~15% rise in density at density high longitudes • ~15% drop in density at density low longitudes • Density low values are more persistent as density highs drop as storm subsides

  24. Conclusions • Density variations accurate to ~5% can be obtained from orbital drag analysis using accurate radar tracking data either side of the perigee passage. • Neutral density variations within the southern hemisphere auroral oval can be obtained from decays of high eccentricity satellite orbits. • This unique data set implies unmodeled longitudinal variations in neutral density in the lower thermosphere auroral zone. • Additional satellite decays are available for further analysis of density variations within the lower thermosphere.

  25. Backup Slides

  26. 16125 Orbital Height History

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