PEPSSIPluto Energetic Particle Spectrometer Investigation (NASA New Horizons Project)
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Atmospheric scientists believe this is a bit beyond the maximum distance at which PEPSSI and SWAP might detect the shock front along which the solar wind collides with Pluto's escaping atmosphere.
In between the Pluto and Charon occultations, the spacecraft will spin, allowing PEPSSI and SWAP to sensitively map the ions and neutral atoms streaming down Pluto's magnetotail (if it has one).
Meanwhile, PEPSSI, SWAP, and SDC will gather data for at least a month after the flyby, corresponding to one rotation of the distant Sun.
New Horizons will continue to transmit data in real time from PEPSSI, SWAP, and SDC.
PEPSSI (Pluto Energetic Particle Spectrometer Science Investigation): Hockey-puck-size time-of-flight mass spectrometer; will measure the composition and density of ions escaping from Pluto's atmosphere.