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Substorm Ion Injection Over Broad Local Time Sector. Energetic Neutral Atom Images IMAGE/HENA, 6/10/00. • Broad injection front, not a narrow sector. Common understanding had been a narrow Local Time Injection. • All energies drift at a rate consistent with injection at about L = 7R E ;

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substorm ion injection over broad local time sector
Substorm Ion InjectionOver Broad Local Time Sector

Energetic Neutral Atom Images IMAGE/HENA, 6/10/00

  • • Broad injection front, not a narrow sector. Common understanding had been a narrow Local Time Injection.
  • • All energies drift at a rate consistent with injection at about L = 7RE;
    • • 6 hr drift period @ 22 keV
    • • 3 hr drift period @ 45 keV

<---- ~0.75 hours, 45 keV ----->

360° Drift Period as a function of Energy, L

Figure adapted from Shultz & Lanzerotti, 1974

<---- ~1.5 hours, 22 keV ----->

substorm ion injection over broad local time sector2
Substorm Ion InjectionOver Broad Local Time Sector

1030UT

At 22 keV,

compare the

appearance

of data (right)

with simulation of M.-C. Fok

(simulated ion flux, anisotropy, and image, from left).

1150UT

substorm ion injection over broad local time sector3
Substorm Ion InjectionOver Broad Local Time Sector

1050UT

At 45 keV,

compare the

appearance

of data (right)

with simulation of M.-C. Fok

(simulated ion flux, anisotropy, and image, from left).

1140UT

substorm ion injection over broad local time sector4
Substorm Ion InjectionOver Broad Local Time Sector

Movie of data (left), simulated ENA (middle),

and simulated ion flux (right)

Simulation courtesy of M.-C. Fok.