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THEMIS

First light: Nature’s welcome. Two substorms seen on March 23. http://sscweb.gsfc.nasa.gov/tipsod. DETAILED VIEW. THEMIS. TH-E. THE. Y. Y. TH-A. Z. TH-B. TH-D. X. TH-C. SUN. THA. THB. X. THC. THD. Z. SUN. POLAR. Satellite Sideview from Dawn. SUN. THB,CDA,E.

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THEMIS

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  1. First light: Nature’s welcome. Two substorms seen on March 23 http://sscweb.gsfc.nasa.gov/tipsod DETAILED VIEW THEMIS TH-E THE Y Y TH-A Z TH-B TH-D X TH-C SUN THA THB X THC THD Z SUN POLAR

  2. Satellite Sideview from Dawn SUN THB,CDA,E

  3. Interplanetary Field Seen by WIND First Substorm Second Substorm Propagation delay From WIND to Earth

  4. From UVI At 11:18:26UT. Substorm intensifies @ 23MLT By 11:19:40UT. Auroras expand to 21.5MLT By 11:23:21UT Expansion slows down

  5. From VIS: 2007_082_1008-1309_all.mov At 11:18:03-45UT. Auroras brighten @ 23MLT By 11:19:57UT. Auroras expand to 22MLT By 11:23:21UT Expansion slows down

  6. Keograms from UVI

  7. Classical mapping Tsyganenko 2001mapping: THEMIS maps to21.5 MLT (other models, orhigher activity place thm tothe West). 21.5MLT

  8. Simulation mapping OpenGGCM mapping:THEMIS just before simulation onset maps to ~22.5 MLT, i.e.,right in the middle of expandingactivation. Note: mapping evolves

  9. Hfrey_mar23_GBO_movie.mpg smoke New Auroral Intensification (Main, ~11:18UT) Previous Intensification (~11:10UT)

  10. 3_23_07_full_view_Movie.mpg New Auroral Intensification (Main, ~11:18:35 UT)

  11. TH-FGL Overview ____ ____ ____ X: Y: Z: THA-FGM FIT Data (3s) Available Note: Z=SMZ Rxy rotated X= - Ewd POLAR UVI/VIS Onset 10:58UT Intensifications

  12. THEMIS Energetic Particles, Overview 11:18 11:19 046, e 97A, p 11:19 1989-046 LANL-97A THEMIS-C THEMIS-D A B [Wenlong Liu and Xinlin Li]

  13. C (fgm) C (sst) Clear dipolarization with a propagation or expanding speed of 200~300 km/s along GSM y direction. Injection occurs ~10-30s earlier than dipolarization D (fgm) D (sst) B (fgm) B (sst) A (fgm) A (sst) E (fgm) E (sst)

  14. Expansion speed on the ground ~ 1 MLT hrs/min • Observed speed in space (from time delays) is ~250km/sFrom 10RE it maps on the ground to ~1 MLT hrs/min • Therefore: • Observed speed in space matches speed on the ground • Expansion speed is the maximum expected from statistics(Nagai ’91: ~ 1MLT/min, 0.5MLT from central meridian) • There is no continuous expansion of the WTS in this case.This was a new activation appearing Westward of old one.Likely the norm?

  15. Moments Overview TH-D

  16. Summary, March 23 11:18 onset • First direct detection of Westward Traveling Surge motion in the magnetosphere • 200km/s westward motion consistent with expectation from ground data • Expansion is motion of activity westward, flows are Earthward and duskward • Simultaneous inward and outward expansion of the injection • Azimuthal effects are dominant in this case THEMIS tail alignments in 2008 will be able to resolve temporal relationship and relative motion of current disruption, dipolarization and particle injections, one of the primary THEMIS objectives

  17. TBD, March 23 11:18 onset • Establish 3 dimensional velocity of expansion (remote sensing using SST data) • Use ground magnetometers at high resolution to establish propagation speed of SCW • Feed back reconstructed currents into global models to improve mapping • Determine FAC intensity from space and its agreement with currents based on modeling of ground based data • Compute flow vorticity • Estimate Curl of B using propagation speed and boundary orientation from remote sensing • Compute pressure gradient of approaching boundary from particle data

  18. Other THEMIS results

  19. Another substorm example Mende et al, GRL 2007

  20. Coast, Placement and Tail Phases Coast http://sscweb.gsfc.nasa.gov/tipsod/ Placement Tail 1 http://sscweb.gsfc.nasa.gov/tipsod/

  21. FTEs on TH-D: Detail

  22. Magnetopause reconnection event,example, overview TH-B TH-B TH-C TH-C TH-D TH-D TH-E TH-A TH-E TH-A

  23. Magnetopause reconnection event,example - detail

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