{
  "abstract": "We present a multi-diagnostic electromagnetic analysis of a dayside magnetosheath interval observed by the Magnetospheric Multiscale (MMS) mission on 2015 December 28 at high ion beta ($β_i = 14.4$), using burst-mode measurements. We combine the scale-dependent electric-to-magnetic field ratio, the parallel electric field, the magnetic compressibility, the wave-normal angle and circular-polarization measure, and the ion--electron frozen-in residuals. The electric-to-magnetic field ratio rises with wavenumber with a log--log slope of +0.92, whereas the ideal advection contribution remains flat, supporting dispersive fluctuations. A wave-normal angle of $75^\\circ$ and a circular-polarization measure centred near zero support quasi-perpendicular propagation, while the compressibility and the ion temperature anisotropy do not support mirror-mode dominance. A continuous broken power-law fit gives $f_{\\rm break} = 0.48 \\pm 0.06$ Hz, corresponding to $k_\\perp d_i = 0.85 \\pm 0.11$ and $k_\\perp ρ_i = 3.23 \\pm 0.42$. Because $d_i$ and $ρ_i$ are well separated at this $β_i$, the break is more consistent with the ion inertial scale than with the ion gyroscale. Four-spacecraft phase differencing independently supports the Doppler conversion around the break. Above the break, the kinetic-range index is $-2.86 \\pm 0.06$ (stat) $\\pm 0.18$ (fit window), closer to the weakly damped dispersive limit than to the strongly damped limit, with a fluid-scale index of $-1.81 \\pm 0.08$ below it. The observations are consistent with quasi-perpendicular KAW-like turbulence, but do not uniquely identify the mode; the spectral index constrains the cascade rather than the dissipation mechanism.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2605.25199",
  "author_total": 3,
  "authors": [
    {
      "name": "Mani K Chettri"
    },
    {
      "name": "Rupak Mukherjee"
    },
    {
      "name": "Hemam D. Singh"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5rkwm3xd3zbk6.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.25199",
  "fulltext_url": null,
  "id": "5rkwm3xd3zbk6",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.25199",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.plasm-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.25199",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5rkwm3xd3zbk6.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:52Z",
      "native_id": "2605.25199",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.25199"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.plasm-ph",
      "subfield": "plasma"
    }
  ],
  "title": "Electromagnetic Signatures of Kinetic Alfvén Wave Turbulence at Ion Inertial Scales in Earth's High-$β$ Magnetosheath",
  "title_text": "Electromagnetic Signatures of Kinetic Alfvén Wave Turbulence at Ion Inertial Scales in Earth's High-β Magnetosheath",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:52Z",
  "url": "https://research.draconitic.com/paper/5rkwm3xd3zbk6",
  "venue": "arXiv",
  "versions": []
}