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Observations of Electrons Accelerated Upwards to keV Energies at 1000 km

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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Observations of Electrons Accelerated Upwards to keV Energies at 1000 km

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  1. 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

  2. Miniaturized Electrostatic Dual-top-hat Spherical Analyzer

  3. 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

  4. Possible Electric Field Configurations

  5. 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.

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