A method for filling gaps in solar irradiance and solar proxy data

Thierry Dudok de Wit (1)

1 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace

Context. Data gaps are ubiquitous in spectral irradiance data, and yet, little effort has been put into finding robust methods for filling them. Aims. We introduce a data-adaptive and nonparametric method that allows us to fill data gaps in multi-wavelength or in multichannel records. Methods. This method, which is based on the iterative singular value decomposition, uses the coherency between simultaneous measurements at different wavelengths (or between different proxies) to fill the missing data in a self-consistent way. The interpolation is improved by handling different time scales separately. Results. Two major assets of this method are its simplicity, with few tuneable parameters, and its robustness. Two examples of missing data are given: one from solar EUV observations, and one from solar proxy data. The method is also appropriate for building a composite out of partly overlapping records.

Mots clés: methods: data analysis; methods: statistical; Sun: UV radiation

Domaines: Planète et Univers [physics]

Thierry Dudok de Wit. A method for filling gaps in solar irradiance and solar proxy data. Astronomy and Astrophysics - A&A, 2011, 533, A29 (6 p.). ⟨10.1051/0004-6361/201117024⟩. ⟨insu-01253613⟩