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

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

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

SSL-SWT 4 Aug 6-8, 2007 First bonus: What produces storm-time “killer” MeV 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 5 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 6 Aug 6-8, 2007 Coast, Placement and Tail Phases Coast Placement Tail 1

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

SSL-SWT 8 Aug 6-8, 2007 Mission overview: Constellation and instrument redundancy Instrument I&T UCB Mission I&T UCB Encapsulation & launch BGS Operations UCB Probe instruments: ESA: ElectroStatic Analyzer (coIs: Carlson and McFadden) SST: Solid State Telescopes (coI: Larson) FGM: FluxGate Magnetometer (coIs: Glassmeier, Auster & Baumjohann) SCM: SearchCoil Magnetometer (coI: Roux) EFI: Electric Field Instrument (coI: Bonnell) Ground SST ESA EFIa EFIs FGM SCM T spin =3s Release CCAS

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

SSL-SWT 10 Aug 6-8, 2007

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

SSL-SWT 12 Aug 6-8, 2007  Probes: Update  All instruments on, MAG booms out, EFI booms deployed on C, D, E.  Probe and instrument power, thermal and health are all nominal  At science-north attitude except for minor tweaks  Completed All Perigee Raise Maneuvers – In coast phase  Plan: <---B-----C-D-E-----A--(B-A:~10,000km, C-D-E:~200km)  Communications: Confirmed that new Microdyne receiver improves link by 6dB  Expect communications at apogee at full link margin  Expect nominal data retrieval through perigee  Operations: Next 2 weeks  Implement density and Bz triggers on all probes  Evaluate nominal data volume for science planning  Nominal operations (after burst mode magnetopause captures) imminent  Data:  Data release automated:  Nominally 2weeks after retrieval  In practice 1hr after downlink  Overview plots available routinely as data becomes available  L2 data available (to be announced via SPDF)  Science software rolled out: since July 31 st (automatically downloads data)  Help line available through on-line form Status

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

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

SSL-SWT 15 Aug 6-8, 2007 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 Strongly recommend to consult PI/coIs 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 ICS9 publication on substorms (Annales Geophysicae) Community advised to: –Tag team with individual instrument leads to learn use of data –Engage in scientific discussions with coIs THEMIS Data Policy

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

SSL-SWT 17 Aug 6-8, 2007 THB THAD C E Useful tools: Orbit viewer Polar Projection In ~1month Zoom tool Available now

SSL-SWT 18 Aug 6-8, 2007 Slow Survey (SS): typically entire orbit FGM (“fge”, FGM 8S/s thru perigee) FGM,EFI - FIT (“fgs”, “efs” spinfits) FGM, EFI timeseries (“fgl eff” 4S/s now, will be reduced in September) SCM, EFI spectra (“fbk” SCM, EFI filterbanks: 1S/4seconds) ESA, SST: MOM (“th?_p??m_*”, ESA and SST moments, scpot) ESA (“pe?r”: one 1x32 /spin and “pe?f” one 88x32/128spins) SST (“ps?r”: one 1x16 /spin and “ps?f” one 64x16/64spins) Fast Survey (FS) 12 hrs total FGM (“fgl” nominal, 4S/s if not already in SS) SCM, EFI timeseries (“scf eff” nominal: 8S/s, “v?f nominal: 4S/s) SCM, EFI spectra (“fbk” nominal, 4S/second) ESA (“pe?r”: one 50x24 /spin ions and one 6x32 /spin electrons, “pe?f” one 88x32/32spins ions and electrons) SST (“psif”: one 64x16 /spin ions and “ps?r” one 6x16/spin electrons) Particle Burst (PB) 8 bursts x 15 min long each FGM (“fgh” nominal, 128S/s) SCM, EFI timeseries (“scp efp” nominal: 128S/s, “v?f nominal 16S/s) SCM, EFI spectra (“ffp” nominal, 1S/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, 8S/s)

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

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

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

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

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

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

SSL-SWT 25 Aug 6-8, 2007 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