The solar spectral irradiance as a function of the Mg ii index for atmosphere and climate modelling

Gérard Thuillier (1) , M. Deland (2) , A. Shapiro (3) , W. Schmutz (3) , D. Bolsée (4) , S. M. L. Melo (5)

1 STRATO - LATMOS
2 SSAI - Science Systems and Applications, Inc. [Lanham]
3 PMOD/WRC - Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center
4 BIRA-IASB - Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique
5 CSA - Canadian Space Agency

We present a new method to reconstruct the solar spectrum irradiance in the Ly α - 400 nm region, and its variability, based on the Mg ii index and neutron-monitor measurements. Measurements of the solar spectral irradiance available in the literature have been made with different instruments at different times and different spectral ranges. However, climate studies require harmonised data sets. This new approach has the advantage of being independent of the absolute calibration and aging of the instruments.

Mots clés: Solar spectrum reconstruction; Mg ii index; Neutron monitor; ATLAS; SOLSPEC

Domaines: Astrophysique stellaire et solaire [astro-ph.SR]; Astrophysique stellaire et solaire [astro-ph.SR]; Climatologie; Milieux et Changements globaux

Gérard Thuillier, M. Deland, A. Shapiro, W. Schmutz, D. Bolsée, et al.. The solar spectral irradiance as a function of the Mg ii index for atmosphere and climate modelling. Solar Physics, 2012, 277 (2), pp.245-266. ⟨10.1007/s11207-011-9912-5⟩. ⟨hal-00665435⟩