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THEMIS: Significant Results from 2 Years of Operations

Explore key findings from THEMIS mission operations, including distinguishing between two models for substorm onset, magnetic reconnection explosions at 25RE, and current disruptions, with a focus on probe alignments and ground conjunctions. Ground-based observatories provide crucial coverage in the North American sector, aiding in determining auroral breakup timings. The timing of ground and space observations revolutionizes substorm science, highlighted in the 2008 Science cover story. New discoveries in low and high-energy particles, flow ions, and macroscale interactions redefine our understanding of space weather phenomena. Dipolarization fronts and self-similar structures found during the second tail season offer insights into kinetic processes at fast scales. Witness how THEMIS's groundbreaking research challenges traditional notions of auroral phenomena and magnetic reconnection processes.

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THEMIS: Significant Results from 2 Years of Operations

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  1. THEMIS Significant results from 2 years of operations

  2. A simpler task: Distinguish BetweenTwo Models for Substorm Onset Magnetic Reconnection: Explosion at 25RE Current Disruption: Implosion at 10RE

  3. 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

  4. : Ground Based Observatory THEMIS Mission elements Probe conjunctions along Sun-Earth line: 4 day recurrence over ground based observatories … while THEMIS’s space-based probes determine onset of Current Disruption and Reconnection each within <10s. Ground based observatories completely cover North American sector; determine auroral breakup within 1-3s …

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

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

  7. 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

  8. 2nd 2nd 2nd 1st 1st 1st 3rd 3rd 3rd Summary Note: this is not the classical time sequence: Aurora brightens before near Earth dipolarization This holds true on several events considered Outside-In model Inside out model Reconnection Aurora Current Disruption THEMIS finds:

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