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Pluto's Interaction With Energetic Heliospheric Ions.

P Kollmann1, M E Hill1, R C Allen1

  • 1The Johns Hopkins University Applied Physics Laboratory Laurel MD USA.

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|July 21, 2022
PubMed
Summary
This summary is machine-generated.

New Horizons data reveals Pluto's magnetosphere depletes energetic ions near the dwarf planet. Ion intensity increases with distance, with oscillations observed in Pluto's wake.

Keywords:
New HorizonsPlutopickup ionswave

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Area of Science:

  • Space physics
  • Plasma physics
  • Planetary science

Background:

  • Energetic ions and suprathermal ions are present in Pluto's environment.
  • The New Horizons spacecraft provided in-situ measurements during its 2015 flyby.

Purpose of the Study:

  • To investigate the behavior and depletion of energetic ions within Pluto's magnetosphere.
  • To analyze the intensity variations and wave phenomena associated with these ions.

Main Methods:

  • Utilizing data from the Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) instrument.
  • Analyzing ion intensities and their relationship to distance from Pluto and magnetospheric boundaries.

Main Results:

  • Pluto's magnetosphere boundary depletes energetic ion intensities by an order of magnitude near the dwarf planet.
  • Ion intensity increases exponentially with distance, returning to interplanetary medium levels at approximately 190 Pluto radii.
  • Oscillations with a 0.2-hour periodicity were observed in Pluto's wake, explained by an ultralow-frequency wave's electric field.

Conclusions:

  • The magnetosphere significantly influences energetic ion populations near Pluto.
  • Ultralow-frequency waves may play a role in shaping the plasma environment within Pluto's wake.
  • No evidence of plutogenic ions was found in the studied energy range.