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Shocks in the Very Local Interstellar Medium.

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This summary is machine-generated.

Voyager spacecraft detected weak, broad shocks in the very local interstellar medium (VLISM). Collisional dissipation, not wave-particle interactions, likely shapes these interstellar shocks, posing new questions about our heliosphere

Keywords:
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Area of Science:

  • Space Physics
  • Astrophysics
  • Plasma Physics

Background:

  • Solar dynamics create disturbances propagating through the heliosphere and into the very local interstellar medium (VLISM).
  • Voyager observations initially suggested shocks in the VLISM, later confirmed by spacecraft crossing the heliopause.

Purpose of the Study:

  • To review outstanding observations of shocks/waves in the VLISM made by Voyager 1 and 2.
  • To summarize current understanding of VLISM shock properties and identify future research questions.

Main Methods:

  • Analysis of electron plasma oscillation events sampled by Voyager 1 in the VLISM.
  • Comparison of observed VLISM shock characteristics with heliospheric shocks.
  • Review of theoretical models and observational data regarding VLISM shocks.

Main Results:

  • VLISM shocks are weak and broad, differing significantly from heliospheric shocks.
  • Collisional dissipation appears to be the primary mechanism shaping VLISM shock structure.
  • The existence of a heliospheric bow shock or wave remains unconfirmed by direct observation.

Conclusions:

  • Collisionality plays a key role in VLISM shock structure.
  • Further research is needed to address open questions about VLISM shocks and waves.
  • Voyager data provides crucial insights into the nature of the interstellar medium beyond our heliosphere.