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Peer-reviewedCC BY 4.0The Astrophysical Journal Supplement Series

Analysis of Aditya-L1/VELC [Fe XIV ] 5303 Å Spectroscopic Observations of the Solar Corona: Development of a Data-processing Pipeline

  • V. Muthu Priyal1
  • Jagdev Singh1
  • R. Ramesh1
  • P. Savarimuthu1
  • S. Nagashree1
  • E. Yuvashree1
  • K. Sasikumar Raja1
  1. 1Indian Institute of Astrophysics
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Abstract

The diagnostic of the green coronal emission line at Fe XIV 5303 Å is very suited for studying the physical conditions and dynamics of the solar corona. The Visible Emission Line Coronagraph (VELC) on board Aditya-L1 has the facility to make spectroscopic observations of this emission line both in raster-scan and sit-and-stare modes. To obtain reliable physical parameters, we have developed a data-processing pipeline that derives the emission peak intensity, line width (full width at half-maximum, FWHM), Doppler velocity, and their associated uncertainties. The data pipeline includes dark subtraction, flat-field correction, spectral curvature correction, spectral drift correction, compensation for filter transmission effects, removal of blending due to an absorption line at the edge of the emission profile, and Gaussian fitting to the corrected emission profile. Instrumental broadening is removed from the observed line width to determine the intrinsic emission-line width. The final outputs—peak intensity, line width, and Doppler velocity—are stored as multilayer FITS cubes containing parameter maps and corresponding uncertainty maps, along with updated header metadata. In this paper, we describe the complete methodology and calibration procedures used in the pipeline. The resulting data products are suitable for coronal diagnostics, Doppler flow measurements, and investigations of temporal and spatial evolution of coronal structures.

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Cite

BibTeXRIS
BibTeX
@article{priyal2026analysis,
  title = {{Analysis of Aditya-L1/VELC [Fe XIV ] 5303 Å Spectroscopic Observations of the Solar Corona: Development of a Data-processing Pipeline}},
  author = {V. Muthu Priyal and Jagdev Singh and R. Ramesh and P. Savarimuthu and S. Nagashree and E. Yuvashree and K. Sasikumar Raja},
  journal = {The Astrophysical Journal Supplement Series},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4365/aea576},
  url = {https://iopscience.iop.org/article/10.3847/1538-4365/aea576},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Analysis of Aditya-L1/VELC [Fe XIV ] 5303 Å Spectroscopic Observations of the Solar Corona: Development of a Data-processing Pipeline
AU  - V. Muthu Priyal
AU  - Jagdev Singh
AU  - R. Ramesh
AU  - P. Savarimuthu
AU  - S. Nagashree
AU  - E. Yuvashree
AU  - K. Sasikumar Raja
PY  - 2026
DA  - 2026/10/16
JO  - The Astrophysical Journal Supplement Series
DO  - 10.3847/1538-4365/aea576
UR  - https://iopscience.iop.org/article/10.3847/1538-4365/aea576
AB  - The diagnostic of the green coronal emission line at Fe XIV 5303 Å is very suited for studying the physical conditions and dynamics of the solar corona. The Visible Emission Line Coronagraph (VELC) on board Aditya-L1 has the facility to make spectroscopic observations of this emission line both in raster-scan and sit-and-stare modes. To obtain reliable physical parameters, we have developed a data-processing pipeline that derives the emission peak intensity, line width (full width at half-maximum, FWHM), Doppler velocity, and their associated uncertainties. The data pipeline includes dark subtraction, flat-field correction, spectral curvature correction, spectral drift correction, compensation for filter transmission effects, removal of blending due to an absorption line at the edge of the emission profile, and Gaussian fitting to the corrected emission profile. Instrumental broadening is removed from the observed line width to determine the intrinsic emission-line width. The final outputs—peak intensity, line width, and Doppler velocity—are stored as multilayer FITS cubes containing parameter maps and corresponding uncertainty maps, along with updated header metadata. In this paper, we describe the complete methodology and calibration procedures used in the pipeline. The resulting data products are suitable for coronal diagnostics, Doppler flow measurements, and investigations of temporal and spatial evolution of coronal structures.
SN  - 0067-0049
SN  - 1538-4365
ER  -