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Area of Science:

  • Space Physics
  • Plasma Physics
  • Astrophysics

Background:

  • Understanding plasma dynamics in the magnetosheath and solar wind is crucial for space weather.
  • Previous studies have focused on larger scales, leaving the subproton kinetic range largely unexplored.
  • Ion velocity and magnetic field correlations provide key insights into plasma behavior.

Purpose of the Study:

  • To investigate the transition of spectral features of ion velocity and magnetic field correlations.
  • To analyze how these correlations evolve from magnetofluid to subproton kinetic scales.
  • To examine cross-helicity, angular alignment, and energy partitioning across various scales.

Main Methods:

  • Utilizing high-resolution data from the Magnetospheric Multiscale (MMS) spacecraft.
  • Employing the Taylor frozen-in approximation for correlation measurements.
  • Conducting direct two-spacecraft correlation measurements.

Main Results:

  • Observed signatures of alignment between velocity (v) and magnetic field (b) at larger scales.
  • Demonstrated the destruction of this alignment as kinetic scales are approached.
  • Identified proton demagnetization as the mechanism responsible for destroying alignment.

Conclusions:

  • The transition from magnetofluid to kinetic scales involves a loss of alignment between velocity and magnetic field.
  • Proton demagnetization plays a critical role in shaping plasma dynamics at subproton scales.
  • This study provides the first spacecraft data analysis of these correlations in the subproton kinetic range.