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Tail substorm dynamics captured by HENA

Tail substorm dynamics captured by HENA. HENA observes ENAs coming from 12 Re in the magnetotail. The observed tail propagates Earthward at substorm dipolarization. Correlated with auroral substorm onset. So far observed for 4 October 2000 and 19 September 2000 storm. SUN. DUSK. DAWN.

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Tail substorm dynamics captured by HENA

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  1. Tail substorm dynamics captured by HENA • HENA observes ENAs coming from 12 Re in the magnetotail. • The observed tail propagates Earthward at substorm dipolarization. • Correlated with auroral substorm onset. • So far observed for 4 October 2000 and 19 September 2000 storm. SUN DUSK DAWN Accelerated ions reach lower altitudes. Auroral onset Dipolarization: Ions accelerated earthward evacuating plasmasheet densities Plasmasheet starts refilling. Edge moving out. Plasmasheet restored. Ions drifting in from nightside filling the plasmasheet

  2. Supporting measurements • The GOES satellite sees dipolarization when tail starts propagating Earthward • The LANL geosynchronous sees particle injection GOES

  3. Equatorial ion distributions 4 OCT 2000 MAINPHASE Sun contamination Dipolarization and injections reach geosynchronous. Auroral onset. Injection complete Stretched tail field. Dense plasmasheet Ions drifts earthward in dipolarization E-field faster than they can be replenished from tail convection field Flux increase due to conservation of adiabatic invariance

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