Tail substorm dynamics captured by hena
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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 l.jpg
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


Supporting measurements l.jpg
Supporting measurements

  • The GOES satellite sees dipolarization when tail starts propagating Earthward

  • The LANL geosynchronous sees particle injection

GOES


Equatorial ion distributions l.jpg
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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