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Heliospheric Energetic Neutral Hydrogen Measured with ASPERA-3 and ASPERA-4

Barabash, S.; Grigoriev, A.; Wurz, P. +6 more

We re-analyze the signal of non-planetary energetic neutral atoms (ENAs) in the 0.4-5.0 keV range measured with the Neutral Particle Detector (NPD) of the ASPERA-3 and ASPERA-4 experiments on board the Mars and Venus Express satellites. Due to improved knowledge of sensor characteristics and exclusion of data sets affected by instrument effects, t…