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Observations of Electrons Accelerated Upwards to keV Energies at 1000 km. Wayne Keith, David Winningham, Olle Norberg, Goran Marklund, and Tomas Karlsson. Observed by the MEDUSA instrument aboard the Swedish Astrid-2 Satellite. MEDUSA characteristics:. 360 ° FOV in spin plane

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slide1

Observations of Electrons Accelerated Upwards

to keV Energies at 1000 km

Wayne Keith, David Winningham, Olle Norberg, Goran Marklund, and Tomas Karlsson

Observed by the MEDUSA instrument aboard the Swedish Astrid-2 Satellite

MEDUSA characteristics:

  • 360° FOV in spin plane
  • 22.5° azimuthal resolution
  • 5° elevation acceptance
  • 31 energy steps
  • 16 electron spectra per second
  • 8 ion spectra per second
  • 460 meter electron resolution
  • 920 meter ion resolution

MEDUSA modes:

  • Select Mode
  • 3 azimuthal sectors
  • Sectors chosen to be
  • closest to B field parallel,
  • perpendicular, and antiparallel
  • Normal Mode
  • 16 azimuthal sectors
  • Sectors co-rotate with
  • satellite
slide3

Astrid-2 Coordinate System

y

x

z

Spin direction

  • Sun is in –z direction
  • MEDUSA is always anti-sunward
  • Aperture plane ± 3° of spin plane
  • E-field measured in spin plane
slide9

Conclusions

Upward electron acceleration as seen by Freja at about 1750 km are observed

by MEUDSA to occur below 1000 km with keV intensities. This raises the

intensity of the electric field required for such accelerations and lowers the

altitude at which acceleration occurs.