{
  "abstract": "Convectively driven motions in the solar photosphere can generate broadband Doppler variability across the chromosphere, transition region and corona. Here we investigate this variability using \"Sun-as-a-Star\" observations from the Extreme Ultraviolet Variability Experiment (EVE) aboard the Solar Dynamics Observatory, constructing high signal-to-noise Doppler power spectra by incoherently averaging spectra from 3-hour sequences of the centroid wavelengths of emission lines that span wavelengths 35-104 nm. The spectra reveal a broad power-spectral continuum with two \"Harvey\" components, one of which extends to the Nyquist frequency at 50 mHz with a steep power-law tail. All emission lines have substantial power both above and below the nominal acoustic cutoff frequency at 5 mHz, but none of the power spectra show maxima corresponding to p-mode or chromospheric 3-minute oscillations. Lines formed in the corona, as compared with those of the chromosphere/transition region, have substantially less Doppler amplitude in the Harvey spectrum associated with granulation-scale convection. Based on the observed continuum, there is no evidence (in any of the 26 lines studied) for Kolmogorov turbulence, which predicts a flat continuum component with Doppler variance ~f^(-5/3) as a function of frequency f. The total inferred RMS velocities (>0.1 mHz) are roughly consistent with coronal microturbulence estimates from excess line widths. These observations provide the first clear detection of Sun-as-a-star EUV Doppler variability above ~10 mHz and demonstrate the potential of full-disk EUV spectroscopy to probe turbulent energy transport throughout a stellar atmosphere.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.05108",
  "author_total": 8,
  "authors": [
    {
      "name": "Hugh Hudson"
    },
    {
      "name": "Anne-Marie Broomhall"
    },
    {
      "name": "Lyndsay Fletcher"
    },
    {
      "name": "David Graham"
    },
    {
      "name": "Sargam M. Mulay"
    },
    {
      "name": "Chris Osborne"
    },
    {
      "name": "Kirsty Williamson"
    },
    {
      "name": "Graham Woan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e2h3ds5y37ra6.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.05108",
  "fulltext_url": null,
  "id": "e2h3ds5y37ra6",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.05108",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2607.05108",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/e2h3ds5y37ra6.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:52Z",
      "native_id": "2607.05108",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.05108"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Signatures of photospheric convection throughout the solar atmosphere: the EVE Sun-as-a-star mHz continuum",
  "title_text": "Signatures of photospheric convection throughout the solar atmosphere: the EVE Sun-as-a-star mHz continuum",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:52Z",
  "url": "https://research.draconitic.com/paper/e2h3ds5y37ra6",
  "venue": "arXiv",
  "versions": []
}