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PreprintCC BY 4.0arXiv

Measuring Small-scale Turbulence in Supernova Remnants with Jitter Radiation

  • Emily Simon
  • Damiano Caprioli
  • Niccolò Bucciantini
  • Emanuele Greco
  • Marco Miceli
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Abstract

Hard X-ray emission from Cas A has been attributed to jitter radiation, implying magnetic turbulence on scales near or below the ion Larmor radius. We propose these fields arise from ion-scale micro-instabilities (e.g., mirror and firehose) in the shock downstream, and use high-resolution hybrid simulations to demonstrate the generation of such small-scale turbulence. Its spectral index, once numerical dissipation is accounted for, is consistent with that inferred for Cas A, suggesting that jitter radiation is a direct probe of ion-scale turbulence in supernova remnants.

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Cite

BibTeXRIS
BibTeX
@misc{simon2026measuring,
  title = {{Measuring Small-scale Turbulence in Supernova Remnants with Jitter Radiation}},
  author = {Emily Simon and Damiano Caprioli and Niccolò Bucciantini and Emanuele Greco and Marco Miceli},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.01715},
  eprint = {2609.01715},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.01715},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Measuring Small-scale Turbulence in Supernova Remnants with Jitter Radiation
AU  - Emily Simon
AU  - Damiano Caprioli
AU  - Niccolò Bucciantini
AU  - Emanuele Greco
AU  - Marco Miceli
PY  - 2026
DA  - 2026/09/01
PB  - arXiv
DO  - 10.48550/arxiv.2609.01715
UR  - https://arxiv.org/abs/2609.01715
AB  - Hard X-ray emission from Cas A has been attributed to jitter radiation, implying magnetic turbulence on scales near or below the ion Larmor radius. We propose these fields arise from ion-scale micro-instabilities (e.g., mirror and firehose) in the shock downstream, and use high-resolution hybrid simulations to demonstrate the generation of such small-scale turbulence. Its spectral index, once numerical dissipation is accounted for, is consistent with that inferred for Cas A, suggesting that jitter radiation is a direct probe of ion-scale turbulence in supernova remnants.
ER  -