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THEMIS Extended Phase = THEMIS baseline + ARTEMIS

THEMIS Senior Review. THEMIS Extended Phase = THEMIS baseline + ARTEMIS. Beyond Substorm Timing, 2 nd tail (FY09) +. Complete prime mission 2 nd year tail: Macroscale interactions: flow diversion or tailward retreat of X-line ? Means of ionospheric coupling

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THEMIS Extended Phase = THEMIS baseline + ARTEMIS

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  1. THEMIS Senior Review THEMIS Extended Phase = THEMIS baseline + ARTEMIS

  2. Beyond Substorm Timing, 2nd tail (FY09) + • Complete prime mission 2nd year tail: • Macroscale interactions: flow diversion or tailward retreat of X-line ? • Means of ionospheric coupling • Coupling to local instabilities: ballooning, whistler modes • Statistics of triggers under a variety of solar wind conditions • Do externally (solar wind) triggered onsets differ from spontaneous ones? • Beyond prime: resolve open questions on substorms: • What causes gradual auroral brightening ahead of onset? • What process enables the current sheet to reconnect? • Does tail history dictate onset mechanism, location? • Extended mission is ideally positioned to go beyond timing studies • Pace of discoveries, and progress expected to accelerate

  3. THEMIS Extension (FY10,11,12)

  4. Z 2010-04-10 00:00:00 P3 P4 X P5 P3,4,5 tail scienceSignificant capability beyond THEMIS • Probes P3,4,5 in an Rq plane, never achieved before, measure: • Cross-tail and field aligned currents under finvariance (ideal 3-point tail constellation) • Tailward expansion speeds using timing, lateral expansion using finite gyroradius Y P5 X P4 P3

  5. Z 2011-05-10 00:00:00 P3 P4 X P5 P3,4,5 dayside scienceSignificant capability beyond THEMIS • Probes P3,4,5 in an Rq plane, never achieved before, measure: • Magnetopause and field aligned currents under under finvariance (ideal 3-point dayside constellation) • Bracket reconnection site, measure inflow and outflow conditions 1st extended dayside Scales: 0.1-1RE, P4 in 2nd , 3rd extended dayside Scales: 50-1000km, P4 out Z 2010-04-10 00:00:00 P4 P3 X P5

  6. Extended THEMIS Baseline (P3,P4,P5) • At the Magnetotail, Study: • Nature of the near-Earth current sheet • Dissipation of bursty fast flows • Result: • Ability to map and model keyinstability region • With first ever: • Simultaneous dR-dZ separations, 0.1-1RE • Clustered orbits study the 8-12RE region Z 2010-04-10 00:00:00 FAST P4 P3 X X P5 Y Courtesy: Pulkkinen and Wiltberger

  7. P4 P3 P5 Extended THEMIS Baseline (P3,P4,P5) • At Inner Magnetosphere, Study Role of: • ULF/VLF/EMIC waves on ion, electron energization/losses • Large electric fields on storm time ring current • Result: • Comprehensive AC waves and E-fields models • Using novel: • 0.1-2RE separations to resolvetemporal/spatial evolution of gradients • daily conjunctions: PFISR, S-DARN

  8. 2010-04-10 00:00:00 Z P4 P3 X P5 [THEMISCoast PhaseMozer et al.GRL] Extended THEMIS Baseline (P3,P4,P5) • At Subsolar Magnetopause, study: • Asymmetric reconnection: dynamics, evolution and role of cold ions • Internal FTE structure and electron acceleration • Result: • Hall-physics of subsolar magneto-pause reconnection, paves way to MMS • Using novel: • Simultaneous dR-dZ separations at 0.1-0.5RE monitor inflow and outflow • Cluster-like separations at subsolar region

  9. ARTEMIS (P1,P2): FY10,11,12 FY10: Translunar injection FY11-12: 6mo Lissajous + 17 mo Lunar

  10. Summary • THEMIS has delivered on its promises • Major discoveries from coast phase in GRL, JGR, SSR special issues • Minimum mission accomplished, substorm trigger identified, to be solidified by 2nd year statistics • Major discoveries from 1st tail season to appear in Science, JGR, Annales Geophysicae • THEMIS to dominate in Intl. Substorm Conference #9 • THEMIS+ARTEMIS: Continue to fully embrace community • All Data Open in CDF, IDL Analysis Code on-line, VMO/SPASE • Help line: THEMIS_Software_Support; Quality Controlled Code updates • Mirror sites proliferating in US, Europe and Asia • Software tutorials at main meetings • Papers by non-team members already in press • THEMIS+ARTEMIS: Can Form Cornerstone of Heliophysics Observatory • In novel orbits, with comprehensive instrumentation, address pressing Heliophysics questions • THEMIS baseline = Clustered at equatorial magnetosphere: uniquely suited to address current dynamics, dissipation • ARTEMIS = Two probes, address fundamental physics in Tail, Solar wind and at the Lunar distances • A bridge in Heliophysics discipline, between ISTP+Cluster era and RBSP, MMS era • Complement existing missions and provide context for new ones (e.g., RBSP)

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