Significant results from 2 years of operations

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Presentation transcript:

Significant results from 2 years of operations THEMIS Significant results from 2 years of operations

Magnetic Reconnection: Explosion at 25RE A simpler task: Distinguish Between Two Models for Substorm Onset Current Disruption: Implosion at 10RE Magnetic Reconnection: Explosion at 25RE

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

THEMIS Mission elements Probe conjunctions along Sun-Earth line: 4 day recurrence over ground based observatories 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

TRx TAI TCD 3rd 1st 2nd 3rd 1st 2nd Timing of ground and space: Ground (3 cameras):

Science Cover Story 2nd 1st 3rd Substorm Timing 1st Tail Season (2008) Angelopoulos et al., Science, 2008 (Also: Pu et al., JGR 2009, Gabrielse et al., 2009, Liu et al., 2009, others) P2 P1 Low energy electrons High energy electrons Flow Ions 3rd 1st 2nd

Macroscale Interactions 2nd tail season (2009) Dipolarization fronts link Rx site to injection fronts Self-similar structures over global scales Front of ion-inertial length in scale, kinetic in nature ~3 min 300 km/s

Summary 2nd 1st 3rd Inside out model Outside-In model 2nd 1st 3rd 3rd Note: this is not the classical time sequence: Aurora brightens before near Earth dipolarization This holds true on several events considered Inside out model Outside-In model 2nd 1st 3rd 3rd 2nd 1st Aurora Reconnection Current Disruption 3rd 1st 2nd THEMIS finds: