Skip to content
DraconiticResearch
Search Sources API
203,203 studies31 sourcesUpdated 13 min ago
Peer-reviewedCC BY 4.0The Astrophysical Journal

Laboratory Measurements of Energy Partitioning and Anomalous Electron Heating in Magnetized, Perpendicular Collisionless Shocks

  • V. Valenzuela-Villaseca1,2,3
  • S. Totorica1,4
  • J. Griff-McMahon1,5
  • L.-J. Chen6
  • S. Malko5
  • P. V. Heuer7
  • P. Pongkitiwanichakul8
  • W. Fox1,5,9
  • D. B. Schaeffer10
10 affiliations
  1. 1Princeton University, Princeton
  2. 2Lawrence Livermore National Laboratory
  3. 3Massachusetts Institute of Technology
  4. 4Department of Astro-fusion Plasma Physics (AFP)
  5. 5Princeton Plasma Physics Laboratory
  6. 6Geospace Physics Laboratory
  7. 7University of Rochester
  8. 8Kasetsart University
  9. 9University of Maryland
  10. 10University of California Los Angeles
Open at sourcePDFDOICite

Abstract

We present laboratory results on energy partitioning from supercritical, magnetized collisionless shock experiments ( M A ∼ 8, M ms ∼ 4). We report the first observation of fully developed laboratory shocks that evolve for more than seven upstream ion gyroperiods and have a downstream region that extends for more than four shocked ion gyroperiods. We use Thomson scattering to measure electron and ion temperatures, plasma density, and flow speeds. We directly measure a compression ratio of 3.6 ± 0.3, consistent with shock jump conditions. A foot ahead of the shock exhibits superadiabatic electron and ion heating. The downstream electron temperature exceeds adiabatic and collisional electron–ion heating by ≈30%, implying significant collisionless anomalous electron heating. We find a downstream electron–ion temperature ratio T e ( d ) / T i ( d ) = 0.8 ± 0.3 , consistent with spacecraft observations but outside the range predicted by theory and numerical simulations.

Related

  1. Experimental Evidence for Reflected Ions and Ion Temperature Anisotropy in a Forming Supercritical Magnetized Collisionless Shock
    Ryo Yamazaki, T. Takezaki, T. Morita +64
    arXivPreprintarXiv licenceFull textHigh-energy astrophysicsPlasma physicsarXiv
  2. Systematic Uncertainties in Rocky Exoplanet Reflected Light from Incomplete Laboratory BRDF Measurements
    Leonardos Gkouvelis, Michael K. Shepard, Paul Helfenstein +2
    arXivPreprintarXiv licenceFull textInstrumentation & methodsPlanetary science & exoplanetsarXiv
  3. The SPHEREx Instrument: Calibration, Testing, and Performance Measurements of the Near-infrared Spectroscopic Surveyor from the Laboratory to In-orbit Commissioning
    Phil M. Korngut, James J. Bock, Samuel Condon +90
    The Astrophysical Journal Supplement SeriesPeer-reviewedCC BY 4.0Full textSolar & stellar physicsCrossref
  4. Perpendicular transport in isotropic magnetic turbulence. The role of stochastic drifts
    F. Pucci, P. Blasi, O. Pezzi +2
    Astronomy & AstrophysicsPeer-reviewedPublisher termsSolar & stellar physicsCrossref
  5. Collisionless Shock Driven by a Supersonic Velocity Shear
    Kazuki Kamiido, Yutaka Ohira
    arXivPreprintCC BY 4.0Full textHigh-energy astrophysicsPlasma physicsarXiv

Cite

BibTeXRIS
BibTeX
@article{valenzuelavillaseca2026laboratory,
  title = {{Laboratory Measurements of Energy Partitioning and Anomalous Electron Heating in Magnetized, Perpendicular Collisionless Shocks}},
  author = {V. Valenzuela-Villaseca and S. Totorica and J. Griff-McMahon and L.-J. Chen and S. Malko and P. V. Heuer and P. Pongkitiwanichakul and W. Fox and D. B. Schaeffer},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/aea838},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea838},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Laboratory Measurements of Energy Partitioning and Anomalous Electron Heating in Magnetized, Perpendicular Collisionless Shocks
AU  - V. Valenzuela-Villaseca
AU  - S. Totorica
AU  - J. Griff-McMahon
AU  - L.-J. Chen
AU  - S. Malko
AU  - P. V. Heuer
AU  - P. Pongkitiwanichakul
AU  - W. Fox
AU  - D. B. Schaeffer
PY  - 2026
DA  - 2026/10/14
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aea838
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aea838
AB  - We present laboratory results on energy partitioning from supercritical, magnetized collisionless shock experiments ( M A ∼ 8, M ms ∼ 4). We report the first observation of fully developed laboratory shocks that evolve for more than seven upstream ion gyroperiods and have a downstream region that extends for more than four shocked ion gyroperiods. We use Thomson scattering to measure electron and ion temperatures, plasma density, and flow speeds. We directly measure a compression ratio of 3.6 ± 0.3, consistent with shock jump conditions. A foot ahead of the shock exhibits superadiabatic electron and ion heating. The downstream electron temperature exceeds adiabatic and collisional electron–ion heating by ≈30%, implying significant collisionless anomalous electron heating. We find a downstream electron–ion temperature ratio T e ( d ) / T i ( d ) = 0.8 ± 0.3 , consistent with spacecraft observations but outside the range predicted by theory and numerical simulations.
SN  - 0004-637X
SN  - 1538-4357
ER  -