Reconstruction of solar UV irradiance since 1974

Abstract

Variations of the solar UV irradiance are an important driver of chemical and physical processes in the Earth's upper atmosphere and may also influence global climate. Here we reconstruct solar UV irradiance in the range 115-400 nm over the period 1974-2007 by making use of the recently developed empirical extension of the SATIRE models employing SUSIM data. The evolution of the solar photospheric magnetic flux, which is a central input to the model, is described by the magnetograms and continuum images recorded at the Kitt Peak National Solar Observatory between 1974 and 2003 and by the MDI instrument on SoHO since 1996. The reconstruction extends the available observational record by 1.5 solar cycles. The reconstructed Ly-alpha irradiance agrees well with the composite time series by Woods et al (2000). The amplitude of the irradiance variations grows with decreasing wavelength and in the wavelength regions of special interest for studies of the Earth's climate (Ly-alpha and oxygen absorption continuum and bands between 130 and 350 nm) is one to two orders of magnitude stronger than in the visible or if integrated over all wavelengths (total solar irradiance).

References in corpus (3)

• NLTE model calculations for the solar atmosphere with an iterative treatment of opacity distribution functions
• Spectral irradiance variations: Comparison between observations and the SATIRE model on solar rotation time scales
• Reconstructed and measured total solar irradiance: Is there a secular trend between 1978 and 2003?

Cited by in corpus (15)

• Evolution of the solar irradiance during the Holocene
• Solar Irradiance Variability and Climate
• Recent variability of the solar spectral irradiance and its impact on climate modelling
• A new approach to long-term reconstruction of the solar irradiance leads to large historical solar forcing
• Reconstruction of total and spectral solar irradiance from 1974 to 2013 based on KPVT, SoHO/MDI and SDO/HMI observations
• Towards a long-term record of solar total and spectral irradiance
• NLTE solar irradiance modeling with the COSI code
• The LYRA Instrument Onboard PROBA2: Description and In-Flight Performance
• A new SATIRE-S spectral solar irradiance reconstruction for solar cycles 21--23 and its implications for stratospheric ozone
• Reconstruction of spectral solar irradiance since 1700 from simulated magnetograms
• Reconstructing solar irradiance from historical Ca II K observations. I. Method and its validation
• Solar irradiance models and measurements: a comparison in the 220 nm to 240 nm wavelength band
• Tests of Sunspot Number Sequences: 1. Using Ionosonde Data
• Rieger-type periodicity in the total irradiance of the Sun as a star during solar cycles 23-24
• Variation of the Mn I 539.4 nm line with the solar cycle