1 / 8

THEMIS Significant results from 2 years of operations

THEMIS Significant results from 2 years of operations. A simpler task: Distinguish Between Two Models for Substorm Onset. Magnetic Reconnection: Explosion at 25R E. Current Disruption: Implosion at 10R E. Substorm Science on THEMIS: Probe Alignments and Ground Conjunctions.

ljeter
Download Presentation

THEMIS Significant results from 2 years of operations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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:

More Related