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THEMIS Conjunctions S. Frey SSL UCB

THEMIS Conjunctions S. Frey SSL UCB. Conjunctions Tail Seasons Conjunctions Dayside Conjunction Criteria Multi Mission Constellations Fieldline Mapping. Tail Season Conjunctions. Tailseason2 - Midnight. Tailseason2 - Dawn. Tailseason1 - Midnight. P1 P2 P3,P4

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THEMIS Conjunctions S. Frey SSL UCB

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  1. THEMIS Conjunctions • S. Frey • SSL UCB • Conjunctions Tail Seasons • Conjunctions Dayside • Conjunction Criteria • Multi Mission Constellations • Fieldline Mapping

  2. Tail Season Conjunctions Tailseason2 - Midnight Tailseason2 - Dawn Tailseason1 - Midnight P1 P2 P3,P4 P5 P1 P2 P3 P5 P4 Tailseason2 - Dusk Tailseason1 - Dusk +5 Re +2 Re -2 Re -5 Re Distance to Neutral Sheet (NS) dt=-7/+6h dY< ±2RE Probe to Neutral Sheet dZ3,4/NS < ± 2RE dZ1,2/NS < ± 5 RE

  3. Dayside Conjunctions dY < +/-2 Re dt=-7/+6 h

  4. Conjunction Criteria dY< ±6RE, x(P1) <-20Re dZ3,4/NS < ± 3RE dZ1,2/NS < ± 7 RE dY< ±2RE dZ3,4/NS < ± 2RE dZ1,2/NS < ± 5 RE dY< ±2RE, x(P1) <-20Re dZ3,4/NS < ± 2RE dZ1,2/NS < ± 5 RE

  5. Tail Seasons ConjunctionsAccumulated in Midnight and Dawn 2007-03-11 188h 2007-02-23 2007-02-07 94h 4 Probe Estimates Meeting all 3 Requirements 2007-01-22 5 Probe Estimates Meeting all 3Requirements Yellow: Radial profile across 20 to 30 Re Lower estimates of accumulated hours of 4/5 probes conjunctions.

  6. Daysides Dayside2 Dayside1 2007-06-30 2007-07-31 2007-07-24 2007-08-16 2007-08-09 2007-09-02 2007-09-17 2007-10-08 2007-10-27 Table: Lower estimates of accumulated hours of 4 probes conjunctions, only for inter probe dy<2Re, and alignment over GBOs

  7. Multiple Missions Tail 2007-Feb-07 06:30 2007-Jun-02 13:45 Left: THEMIS aligned at midnight with CLUSTERnear noon, GEOTAIL at dawn in foreshock region. Right: GEOTAIL at -30 Re with THEMIS outer probes and CLUSTERaround magnetosphere on opposite flanks.

  8. Multiple Missions Dayside Orbits Centered at 2007-Aug-13 18:30:00 THEMIS CLUSTER GEOTAILIMAGE THEMIS aligned along upstream solar wind with GEOTAIL, CLUSTER crossing tail, IMAGE apogee below equator.

  9. THEMIS and CLUSTER Schematic depiction of THEMIS and CLUSTER orbits in GSE in 2007 Combined Studies 2007: Winter: Tail-Cusp Spring: Dusk-Dawn Flanks Summer: Tail-LLBL Fall: Dawn-Dusk Flanks Courtesy MA Hapgood, Rutherford Laboratory,UK

  10. Fieldline Mapping P1 footprints P2 footprints P3,4 footprints P5 footprints Tsyganenko 2000 IGRF 2000 Auroral brightness at THEMIS footprints THEMIS Footprint Latitude with IMF Bz

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  12. Orbit Design History Change of Launch Trajectory Apogee Perigee Inclination Arg. of Per. RA of Per. Period Re Re deg deg deg h 12.101 1.1 9.0 0 312 ~24 12.101 1.05 9.5 0 312 ~24 14.4 1.07 13.5 -10 312 ~30 Increase of Number of Maneuvers End of Tail1 End of Day2 P3,4 4 - 6 9 - 13 P5 6 - 7 9 - 24 P1,2 9 - 9 21- 24 69 - 98 Total Impulsive dV m/s P1 P2 P3 P4 P5 730 470 430 430 695 690 470 550 550 600 630 450 520 520 630

  13. Launch Day Delay 4 Probes ConjunctionsAccumulated in Midnight and Dawn 188h 5 Probes 94h Accumulated Impulsive dV At end of Tail Season 1 Maximum Shadow During Tail Season 1

  14. Dusk and Dawn Flanks • Left: Dusk and dawn flanks • Outer probe conjunctions • along magnetopause, • At bow shock and • magnetopause, • Across magnetosheath. 2007-May-17 2007-May-05 2007-Jun-03 • Yellow: • Radial profile across 20 Re • to measure energetic • electrons • Right:YZ-GSM • 2007-May-17 • 2007-Nov-18 2007-Oct-24 2007-Nov-18 2007-Nov-01

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