{
  "abstract": "Coronal mass ejections (CMEs) undergo rapid evolution in the low corona ($<2R_\\odot$), yet their three-dimensional kinematics remain poorly constrained. We present a spectroscopic and imaging analysis of a CME observed on 2024 August 5 using the Visible Emission Line Coronagraph (VELC) on board ADITYA-L1 and Atmospheric Imaging Assembly (AIA)/Solar Dynamics Observator (SDO). The VELC Fe XIV 5303 Å spectra captured the erupting CME as it crossed the western slit. Space-time maps from single-Gaussian fits reveal coronal dimming and enhanced Doppler velocities during the eruption. Detailed spectral analysis reveals strongly Doppler-shifted secondary components associated with the CME front. These components appear as two spatially separated emission branches on opposite sides of the rest wavelength, producing a distinct bifurcated spectral morphology superposed on the nearly stationary reduced-intensity coronal emission. Double-Gaussian fitting yields line-of-sight (LOS) plasma velocities of up to 218 km/s, likely a lower limit as the secondary component reaches the edge of spectral window. AIA 211 Å observations measure a projected radial speed of 1135 km/s, larger than the plane-of-sky (POS) lateral speed of 692 km/s along the slit. To interpret the observed CME evolution and spectral structure, we developed a simplified three-dimensional geometric-kinematic model of an expanding axially tilted CME shell. Synthetic spectra from the model show that an inclined CME undergoing asymmetric lateral expansion can produce a bifurcated spectral morphology similar to that observed, with velocity components projected in the radial, POS-lateral, and LOS-lateral directions. Our results demonstrate that combining spectroscopy and EUV imaging constrains different components of CME kinematics during early evolution.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: S. Tripathi, T. Samanta, & J. Joshi, 2026, ApJL, 1009, L24",
  "arxiv": "2609.31894",
  "author_total": 3,
  "authors": [
    {
      "name": "Saurabh Tripathi"
    },
    {
      "name": "Tanmoy Samanta"
    },
    {
      "name": "Jayant Joshi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5eek3nsshk8a8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.31894",
  "fulltext_url": null,
  "id": "5eek3nsshk8a8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.31894",
  "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/2609.31894",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5eek3nsshk8a8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.31894",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.31894"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Spectroscopic Signatures of Nonuniform Lateral Expansion of a Coronal Mass Ejection in the Low Corona with ADITYA-L1/VELC",
  "title_text": "Spectroscopic Signatures of Nonuniform Lateral Expansion of a Coronal Mass Ejection in the Low Corona with ADITYA-L1/VELC",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/5eek3nsshk8a8",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3847/2041-8213/aea295",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}