ESWW 11 November 2014 Summary Daily observations of the solar radio flux in various wavelengths (1-30 cm) have been carried out since the 1950’s We have.

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Presentation transcript:

ESWW 11 November 2014 Summary Daily observations of the solar radio flux in various wavelengths (1-30 cm) have been carried out since the 1950’s We have merged them into one unique and homogenous database (available for download) The radio flux at 30 cm is a better proxy for upper atmosphere modelling than the usual 10.7 cm flux 1 60 years of multi-wavelength solar radio observations as proxies for upper atmosphere modelling T. Dudok de Wit 1), S. Bruinsma 2), K. Shibasaki 3) 1) LPC2E, University of Orléans, 2) GRGS, CNES, Toulouse, 3) Nobeyama Solar Radio Observatory, Nagano Full article: Dudok de Wit et al., SWSC (2014) Each of the 5 slides lasts for 20 to 30 seconds

ESWW 11 November years of solar radio observations Daily, and carefully calibrated measurements of centimetric wavelength have been made since the 1950’s (Penticton, Ottawa, Toyokawa, Nobeyama) 2 Each slde takes 30 seconds Each of the 5 slides lasts for 20 to 30 seconds

ESWW 11 November 2014 Physical underpinning By using blind source separation, we find that the solar rotational variability can be decomposed into 3 contributions (see below) Gyroresonance (= active sunspot groups) Gyroresonance (= mostly sunspots) Bremsstrahlung (= mostly plages and faculae) 3 Decomposition of the solar radio flux (excerpt) into its three contributions 3.2 cm flux 10.7 cm flux 30 cm flux Each slide takes 30 seconds Each of the 5 slides lasts for 20 to 30 seconds

ESWW 11 November cm: a better proxy for the UV The 30 cm flux (red) is systematically better correlated with the the solar EUV-UV irradiance ( ) than the usual 10.7 cm flux (blue) 4 Correlation between radio flux and irradiance in the UV Correlation estimated for solar rotational variability (NOT solar cycle) Each slide takes 30 seconds Each of the 5 slides lasts for 20 to 30 seconds

ESWW 11 November 2014 Long-term evolution All wavelengths exhibit the same long-term evolution (because they are all dominated by Bremsstrahlung) 5 Each slide takes 30 seconds Each of the 5 slides lasts for 20 to 30 seconds