THEMIS MISSION Overview Status And First Results SSLSWT

THEMIS MISSION Overview Status And First Results • • • SSL-SWT Introduction Mission elements Mission Status First light: Tail’s welcome Dayside Events 1 Aug 6 -8, 2007

Maximizing Substorm Science on THEMIS: Probe Alignments and Ground Conjunctions Simulation: J. Raeder, UNH Visualization: Tom Bridgman, GSFC/SVS Vassilis Angelopoulos, UCLA ESS April 13, 2006 SSL-SWT 2 Aug 6 -8, 2007

THEMIS Mission elements Probe conjunctions along Sun-Earth line recur once per 4 days over North America. … while THEMIS’s space-based probes determine onset of Current Disruption and Reconnection each within <10 s. Ground based observatories completely cover North American sector; determine auroral breakup within 1 -3 s … : Ground Based Observatory SSL-SWT 3 Aug 6 -8, 2007

First bonus: What produces storm-time “killer” Me. V electrons? Source: – Radially inward diffusion? – Wave acceleration at radiation belt? THEMIS: –Tracks radial motion of electrons • Measures source and diffusion • Frequent crossings –Measures E, B waves locally SSL-SWT 4 Aug 6 -8, 2007

Second bonus: What controls efficiency of solar wind – magnetosphere coupling? Solar wind energy transfer in Geospace Need to determine how: – Localized pristine solar wind features… – …interact with magnetosphere THEMIS: – Alignments track evolution of solar wind – Inner probes determine entry type/size SSL-SWT 5 Aug 6 -8, 2007

Coast, Placement and Tail Phases Coast http: //sscweb. gsfc. nasa. gov/tipsod/ Placement Tail 1 http: //sscweb. gsfc. nasa. gov/tipsod/ SSL-SWT 6 Aug 6 -8, 2007

Conjunctions exceed requirements of 188 hrs/season with ~50% margin SSL-SWT 7 Aug 6 -8, 2007

Mission overview: Constellation and instrument redundancy D 2925 -10 @ CCAS EF Ia EFIs SCM ESA BGS SST Release Operations UCB io ulat aps Enc unch & la n Mission I&T UCB Instrument I&T UCB SSL-SWT Ground 8 FGM Tspin=3 s Probe instruments: ESA: Electro. Static Analyzer (co. Is: Carlson and Mc. Fadden) SST: Solid State Telescopes (co. I: Larson) FGM: Flux. Gate Magnetometer (co. Is: Glassmeier, Auster & Baumjohann) SCM: Search. Coil Magnetometer (co. I: Roux) EFI: Electric Field Instrument (co. I: Bonnell) Aug 6 -8, 2007

Mission overview: Ground based observatories (co-I: S. Mende) co-I: Stephen Mende ASI Production line @ UCB EPO lead: Laura Peticolas GMAG co-I: Chris Russell SSL-SWT Fort Yukon, AK, site 9 EPO GMAG in Carson City, NV Aug 6 -8, 2007

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co-I: Chris Russell SSL-SWT co-I: Eric Donovan 11 co-I: Ian Mann Aug 6 -8, 2007

Status q. Probes: Update q. All instruments on, MAG booms out, EFI booms deployed on C, D, E. q. Probe and instrument power, thermal and health are all nominal q. At science-north attitude except for minor tweaks q. Completed All Perigee Raise Maneuvers – In coast phase q. Plan: <---B-----C-D-E-----A--(B-A: ~10, 000 km, C-D-E: ~200 km) q. Communications: Confirmed that new Microdyne receiver improves link by 6 d. B q. Expect communications at apogee at full link margin q. Expect nominal data retrieval through perigee q. Operations: Next 2 weeks q. Implement density and Bz triggers on all probes q. Evaluate nominal data volume for science planning q. Nominal operations (after burst mode magnetopause captures) imminent q Data: q. Data release automated: q Nominally 2 weeks after retrieval q In practice 1 hr after downlink q. Overview plots available routinely as data becomes available q. L 2 data available (to be announced via SPDF) q. Science software rolled out: since July 31 st (automatically downloads data) q. Help line available through on-line form SSL-SWT 12 Aug 6 -8, 2007

THEMIS Data Analysis Software Status • Analysis tools available (IDL-based); under QA testing Public since July 31 st at: http: //themis. ssl. berkeley. edu – Platform independent, work on Solaris, Linux, Win, Mac. OSx – Auto file retrieval – Easy to install and download files – GUI available for IDL starters • Contributions by any scientist • Maintenance with Sub. Versio. N • Documentation includes: – Users Guide – Developers Guide – Subversion – Latest list of routines SSL-SWT 13 Aug 6 -8, 2007

Data Overviews: both at SPDF and UCB ASI MOSAICS SSL-SWT 14 Aug 6 -8, 2007

THEMIS Data Policy • Open data policy – Data on the street only 2 weeks after collection (typically sooner) – Also, preliminary calibrations and overview plots and software available – Rules of the road published on web: • Credits: Always credit: NAS 5 -02099 • Strongly recommend to consult PI/co. Is on data before study; at least acknowledgement • Journal editors will be requested to ensure above rules have been adhered to • First publications expected by instrument leads – Space Science Reviews papers • One compendium, demonstrates instruments and use of data • Encourage multi author papers to acknowledge team effort • THEMIS team – Benefits through familiarity with mission/data, team and on-going participation – Has a responsibility to publish first science papers in upcoming publications • GRL special issue on first science results • Will support ICS 9 publication on substorms (Annales Geophysicae) • Community advised to: – Tag team with individual instrument leads to learn use of data – Engage in scientific discussions with co. Is SSL-SWT 15 Aug 6 -8, 2007

Useful tools: Overview plots SSL-SWT 16 Aug 6 -8, 2007

Useful tools: Orbit viewer http: //sscweb. gsfc. nasa. gov/tipsod Zoom tool Available now C THB E D THA Polar Projection In ~1 month SSL-SWT 17 Aug 6 -8, 2007

Slow Survey (SS): typically entire orbit FGM (“fge”, FGM 8 S/s thru perigee) FGM, EFI - FIT (“fgs”, “efs” spinfits) FGM, EFI timeseries (“fgl eff” 4 S/s now, will be reduced in September) SCM, EFI spectra (“fbk” SCM, EFI filterbanks: 1 S/4 seconds) ESA, SST: MOM (“th? _p? ? m_*”, ESA and SST moments, scpot) ESA (“pe? r”: one 1 x 32 /spin and “pe? f” one 88 x 32/128 spins) SST (“ps? r”: one 1 x 16 /spin and “ps? f” one 64 x 16/64 spins) Fast Survey (FS) 12 hrs total FGM (“fgl” nominal, 4 S/s if not already in SS) SCM, EFI timeseries (“scf eff” nominal: 8 S/s, “v? f nominal: 4 S/s) SCM, EFI spectra (“fbk” nominal, 4 S/second) ESA (“pe? r”: one 50 x 24 /spin ions and one 6 x 32 /spin electrons, “pe? f” one 88 x 32/32 spins ions and electrons) SST (“psif”: one 64 x 16 /spin ions and “ps? r” one 6 x 16/spin electrons) Particle Burst (PB) 8 bursts x 15 min long each FGM (“fgh” nominal, 128 S/s) SCM, EFI timeseries (“scp efp” nominal: 128 S/s, “v? f nominal 16 S/s) SCM, EFI spectra (“ffp” nominal, 1 S/s) Wave Burst (WB) 2 WBs within each PB SCM, EFI timeseries (“scw efw” nominal: 8196 S/s, “v? f nominal 8196 S/s) SCM, EFI spectra (“ffw” nominal, 8 S/s) SSL-SWT 18 Aug 6 -8, 2007

First light: Nature’s welcome. Two substorms seen on March 23 [Runov, private communication] SSL-SWT 19 Aug 6 -8, 2007

First light: Nature’s welcome. Two substorms seen on March 23 http: //sscweb. gsfc. nasa. gov/tipsod DETAILED VIEW THEMIS TH-E TH-A TH-B TH-D TH-C THE Y Y Z X SUN THA THB THD SUN THC POLAR SSL-SWT 20 Aug 6 -8, 2007

THEMIS Magnetic Field, Overview TH-GBOs: High resolution & sensitivity Onset: 11: 12: 51 UT, Intensification: 11: 18: 30 UT X: ____ Y: ____ Z: ____ Dipolarization first on THD Onset: 11: 13 UT Precursor: 10: 58 UT Intensification: 11: 18 UT Latitude at pre-Midnight Courtesy: Parks, Fillingim, Sigwarth POLAR UVI/VIS: GLOBAL VIEW …then on TH D, B, E UT SSL-SWT 21 Aug 6 -8, 2007

GMAG ASI FGM, magnetic field ESA, i+ , e- densities ESA, velocity ESA, temperature SST, energetic ions ESA, plasma ions SST, energetic electrons ESA, plasma electrons SSL-SWT 22 Aug 6 -8, 2007

THEMIS Energetic Particles, Overview 11: 18 11: 19 046, e 97 A, p 11: 19 1989 -046 LANL-97 A THEMIS-C THEMIS-D A B [Wenlong Liu and Xinlin Li] SSL-SWT 23 Aug 6 -8, 2007

11: 16 ? 11: 21 Electron Drift 11: 19: 50 Ion Drift 11: 21~23 11: 22 11: 18 11: 19: 10 SSL-SWT 24 THC far from Equator. Injection w/o dipolarization 200~300 km/s [in collaboration with Davin Larson, Andreas Keilling, Wenlong Liu and Xinlin Li] Aug 6 -8, 2007

Summary, March 23 11: 18 onset q First direct detection of Westward Traveling Surge motion in the magnetosphere q 200 km/s westward motion consistent with expectation from ground data q Expansion is motion of activity westward, flows are Earthward and duskward q Simultaneous inward and outward expansion of the injection q 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 SSL-SWT 25 Aug 6 -8, 2007