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Cluster/DMSP Conjunctions in the Cusp

Cluster/DMSP Conjunctions in the Cusp. Wayne Keith NASA Goddard Space Flight Center. With grateful acknowledgements to M. Goldstein, T. Stubbs, D. Winningham, A. Fazakerley, and H. Rème. To what degree are cusp structures comparable from mid to low altitudes?. Finding Magnetic Conjunctions.

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Cluster/DMSP Conjunctions in the Cusp

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  1. Cluster/DMSP Conjunctions in the Cusp Wayne Keith NASA Goddard Space Flight Center With grateful acknowledgements to M. Goldstein, T. Stubbs, D. Winningham, A. Fazakerley, and H. Rème 8th Cluster Workshop, Sept 30, 2004

  2. To what degree are cusp structures comparable from mid to low altitudes? 8th Cluster Workshop, Sept 30, 2004

  3. Finding Magnetic Conjunctions • Appropriate common (mapped) coordinates • Identify cusp crossings for Cluster • Search Cluster crossings for DMSP satellites within 5° (~550 km) of Cluster footprint • Rank quality of DMSP data • Compare relative timing of particle signatures 8th Cluster Workshop, Sept 30, 2004

  4. Automated Search Procedure • Mapped Cluster center-of-mass coordinates calculated via T01 and ingested into system • Conjunction software run for all Cluster cusp crossing times • For times when a DMSP satellite is within a “cusp box”, check their proximity using: • If  < 5°, write start/stop times to a file • Automatically generate DMSP plot for closest approach ±2 min 8th Cluster Workshop, Sept 30, 2004

  5. The score so far: • January through August 2001 searched • 73 Cluster cusp crossings • 172 DMSP magnetic close-approaches • 53 of which contained “good” particle signatures • 35 Cluster passes contained at least one good DMSP crossing • 14 good coincidence between closest approach and cusp signature • 2 conjunctions under study (one in each major Cluster “cusp season”) 8th Cluster Workshop, Sept 30, 2004

  6. 29 March, 2001 Cluster ~ 8 Re 8th Cluster Workshop, Sept 30, 2004

  7. Day 88 footprint map 8th Cluster Workshop, Sept 30, 2004

  8. Day 88 DMSP F-12 8th Cluster Workshop, Sept 30, 2004

  9. Day 88 DMSP F-14 8th Cluster Workshop, Sept 30, 2004

  10. Day 88 Cluster-1 8th Cluster Workshop, Sept 30, 2004

  11. Day 88 all sc 8th Cluster Workshop, Sept 30, 2004

  12. Day 88 all Cluster 8th Cluster Workshop, Sept 30, 2004

  13. 14 August, 2001 Cluster ~ 5 Re 8th Cluster Workshop, Sept 30, 2004

  14. Day 226 footprint map 8th Cluster Workshop, Sept 30, 2004

  15. Day 226 all sc 8th Cluster Workshop, Sept 30, 2004

  16. Day 226 all Cluster 8th Cluster Workshop, Sept 30, 2004

  17. SD frame 1 8th Cluster Workshop, Sept 30, 2004

  18. SD frame 2 8th Cluster Workshop, Sept 30, 2004

  19. SD frame 3 8th Cluster Workshop, Sept 30, 2004

  20. SD frame 4 8th Cluster Workshop, Sept 30, 2004

  21. SD frame 5 8th Cluster Workshop, Sept 30, 2004

  22. SD frame 6 8th Cluster Workshop, Sept 30, 2004

  23. SD frame 7 8th Cluster Workshop, Sept 30, 2004

  24. SD frame 8 8th Cluster Workshop, Sept 30, 2004

  25. SD frame 9 8th Cluster Workshop, Sept 30, 2004

  26. SD frame 10 8th Cluster Workshop, Sept 30, 2004

  27. SD frame 11 8th Cluster Workshop, Sept 30, 2004

  28. SD frame 12 8th Cluster Workshop, Sept 30, 2004

  29. SD frame 13 8th Cluster Workshop, Sept 30, 2004

  30. Conclusions • Cluster/DMSP conjunctions identified using combination of automated and manual search techniques • Mapped Cluster cusp location usually poleward of DMSP cusp location • Cusp appears narrow in Invariant Latitude and extended in Magnetic Local time • Cusp structures appear similar in general, but Cluster data requires more study 8th Cluster Workshop, Sept 30, 2004

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