SOLAR-HRS : High-resolution extraterrestrial solar Reference Spectra for disk-integrated, disk-center, and intermediate cases


Description

Accurate knowledge of the solar spectrum and its chemical composition represent essential data for solar physics, astronomy, cosmology, and geophysics. The determination of high-resolution solar reference spectra (disk-integrated, disk-center, or intermediate cases) is fundamental and represents key inputs for interpreting remote sensing measurements that uses sunlight. In this work, we present several new solar irradiance reference spectra at high resolution representative of solar minimum conditions. The High-resolution extraterrestrial solar Reference Spectra (HRS disk-integrated) is developed by normalizing high spectral resolution solar line data to the absolute irradiance scale of the SOLAR-ISS reference spectrum. The resulting HRS disk-integrated solar spectrum has a spectral resolution varying between 1.0 and ∼0.001 nm in the 0.5 – 4400 nm wavelength range. We have also developed a solar HRS disk-center solar spectrum, which spans 650 – 4400 nm at 0.02 to ∼ 0.001 nm spectral resolution. We implemented several solar spectra (HRS intermediate cases) for ten different solar view-angles from μ = 0.9 to μ = 0.05. Finally, we developed several spectra (disk center and disk-Integrated spectrum) based on solar modeling (MPS-ATLAS based on Kurucz solar linelists and Vald3 solar linelists).

SOLAR-HRS spectrum (v1.1). Meftah M. et al., 2022

Methods

The HRS disk-integrated solar spectrum is based on SOLAR-ISS reference spectrum (absolute determination from 0.5 to 3000 nm), QualityAssurance of Spectral Ultraviolet Measurements In Europe Fourier Transform Spectrometer (QASUMEFTS) solar irradiance observations (from 300 to 380 nm), and solar pseudo-transmittance (from 300 to 4400 nm). The solar pseudo-transmittance spectrum (Toon, 2014) is obtained from an empirical solar linelist, which have been generated by simultaneous fitting of ATMOS, MkIV, Kitt Peak, Denver U, and TCCON spectra and by a telluric absorptions fit using the HITRAN linelist (any remaining airmass-independent absorptions were attributed to the Sun). The same approach is used to obtain the HRS disk-center solar spectrum, which is based on solar pseudo-transmittance spectrum for disk-center (Toon, 2014). The 1D MPS-ATLAS solar spectra (with Kurucz or Vald3 linelists) are based on the Merged Parallelised Simplified ATLAS code (Witzke et al., 2021). From solar parameters (Teff, log g, Fe/H+ abundances, …), MPS-ATLAS calculates solar spectra together with their centre-to-limb variations (CLV). Then, we can obtain disk-centre and disk-integrated spectra. From solar models, we obtained several solar spectra for eleven different solar view-angles from μ = 1.0 to μ = 0.05. Based on solar models, we deduce the HRS solar spectra for ten different solar view-angles from μ = 0.9 to μ = 0.05.

Temporal extents

Solar minimum - April 2008 / December 2019

Data access

The various new high-resolution solar reference spectra derived from this work and listed below can be downloaded from the VOSCAT portal:
  • the high resolution solar spectrum disk integrated (SOLAR-HRS Disk-Integrated Spectrum)
  • the high resolution solar spectrum at disk center (SOLAR-HRS Disk center)
  • the high resolution solar spectrum at solar positions (SOLAR-HRS Solar positions)
  • the high resolution solar spectrum Disk-Integrated at Air Mass 1.5 (SOLAR-HRS AM1.5)
  • the high resolution solar spectrum Disk-Integrated at Air Mass 1.5 (air) (SOLAR-HRS AM1.5 (air))
  • the high resolution solar spectrum ATLAS Kurucz model integrated disk (MPS-ATLAS-Kurucz Disk-Integrated Spectrum)
  • the high resolution solar spectrum ATLAS Kurucz model disk center (MPS-ATLAS-Kurucz Disk center)
  • the high resolution solar spectrum ATLAS Vald3 model integrated disk (MPS-ATLAS-Vald3 Disk-Integrated Spectrum)
  • the high resolution solar spectrum ATLAS Vald3 model disk center (MPS-ATLAS-Vald3 Disk center)
Table of SOLAR-HRS datasets. Meftah M. et al., 2022


Publications

[1] Meftah M. et al., 2022 (under preparation)


Contacts

Principal Investigator/Owner:

Mustapha Meftah (LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS) Mustapha.Meftah@latmos.ipsl.fr

Co-Investigator:

Sarkissian Alain (LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS) Alain.Sarkissian@latmos.ipsl.fr

Other (DOI manager):

Reberac Aurélie (LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS) Aurelie.Reberac@latmos.ipsl.fr


Dataset information

doi = 10.21413/SOLAR-HRS-DATASET.V1.1_LATMOS
url = https://doi.org/10.21413/solar-hrs-dataset.v1.1_latmos

Howto cite

(APA style)
Meftah M. (2022). SOLAR-HRS: High-resolution extraterrestrial solar Reference Spectra for disk-integrated, disk-center, and intermediate cases (Version 1.1) [Data set]. LATMOS. https://doi.org/10.21413/SOLAR-HRS-DATASET.V1.1_LATMOS

(BibTex style)
@misc{https://doi.org/10.21413/solar-hrs-dataset.v1.1_latmos,
  doi = {10.21413/SOLAR-HRS-DATASET.V1.1_LATMOS},
  url = {http://doi.latmos.ipsl.fr/DOI_SOLAR_HRS.v1.1.html},
  author = {Meftah, Mustapha},
   title = {SOLAR-HRS: The HRS high-resolution extraterrestrial solar reference spectra for disk-integrated, disk-center, and intermediate cases},
  publisher = {LATMOS},
  year = {2022}
}