High Energy Neutral Atom (HENA)

• HENA Observations

  • Neutral atom composition and energy-resolved images over three energy ranges: 10-500 keV

• Measure Requirements

  • FOV: 90°x 120°
  • Angular Resolution: 4°x 4°
  • Energy Resolution (delta E/E): 0.8
  • Sensitivity: Effective area 1 cm²

• Storm/substorm Observations

  • Image Time: 2 minutes generating 720 images/day

• Derived Quantities:

  • Neutral atom image of composition and energy of the Ring Current and near-Earth Plasma Sheet
  • HENA/MENA instrument data combined to make a provisional Dst index
  • Plasma Sheet and Ring Current injection dynamics, structure, shape and local time extent

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