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Turbulence in the Local Interstellar Medium and the IBEX Ribbon.

E J Zirnstein1, J Giacalone2, R Kumar1

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Turbulence in the very local interstellar medium (VLISM) affects the Interstellar Boundary Explorer (IBEX) ribbon structure. Simulations show smaller turbulence scales (≲50 au) create a ribbon consistent with IBEX observations.

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Heliophysics

Background:

  • The Interstellar Boundary Explorer (IBEX) ribbon's structure is hypothesized to be influenced by turbulence in the very local interstellar medium (VLISM).
  • Particle trapping by magnetic mirroring in turbulent fields is proposed as a key mechanism for ribbon formation.

Purpose of the Study:

  • To investigate the role of VLISM turbulence in shaping the IBEX ribbon structure.
  • To simulate charged particle motion in turbulent magnetic fields and compare results with observational data.

Main Methods:

  • Simulated charged particle motion in turbulent magnetic fields, including spatially-uniform and draped large-scale fields.
  • Incorporated Voyager 1 observations of VLISM turbulence into simulations.
  • Analyzed the impact of different turbulence scales and strengths on ribbon structure.

Main Results:

  • Simulations did not reproduce a double-peaked ribbon structure as previously suggested.
  • Magnetic mirroring remains a significant factor in particle trapping.
  • Ribbon thickness increases with a draped large-scale magnetic field.
  • Turbulence at scales ≳100 au, consistent with Voyager 1, yields structures inconsistent with IBEX observations.
  • Restricting turbulence to <100 au scales produces smoother structures resembling IBEX observations.
  • Large-scale ribbon structure is robust for maximum fluctuation sizes ≲50 au.

Conclusions:

  • The heliosphere-VLISM interaction, not solely pristine interstellar turbulence, likely determines magnetic field structure at scales ≲50 au.
  • VLISM turbulence plays a crucial role in shaping the IBEX ribbon, with smaller scales being more consistent with observations.
  • The observed IBEX ribbon structure suggests limitations on the scale of interstellar turbulence influencing the heliospheric boundary.