Medium Energy Neutral Atom (MENA)

• MENA Observations

  • Neutral atom composition and energy-resolved images over three energy ranges: 1-30 keV

• Measure Requirements

  • FOV: 90°x 107°
  • Angular Resolution:4°x 8°
  • 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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