Monitoring the solar UV irradiance spectrum from the observation of a few passbands

Details Monitoring the solar UV irradiance spectrum from the observation of a few passbands Monitoring the solar UV irradiance spectrum from the observation of a few passbands

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...528a..68c&link_type=abstract

Astronomy & Astrophysics, Volume 528, id.A68

Astronomy and Astrophysics

Astrophysics

2

Sun: Uv Radiation, Instrumentation: Photometers, Methods: Statistical, Methods: Data Analysis

Scientific paper

Context. The solar irradiance in the UV is a key ingredient in space weather applications; however, because of the lack of continuous and long-term observations, various indices are still used today as surrogates for the solar spectral irradiance. Aims: As an alternative to current spectrometers we use a few radiometers with properly chosen passbands and reconstruct the solar spectral irradiance from their outputs. The feasibility of such a reconstruction is justified by the high redundancy in the spectral variability. Methods: Using a multivariate statistical approach, we first compared six years of daily-averaged UV spectra and a selection of passbands (from existing radiometers) and solar indices. This leads to a strategy for defining those passbands that are most appropriate for reconstructing the spectrum. Results: With four passdbands chosen from already existing instruments, we reconstruct the UV spectrum with a relative error of about 20%. Better performance is achieved with a combination of passbands than with a combination of indices.

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