The LYRA instrument onboard ESA PROBA2 satellite will provide 6-hourly solar irradiance at the Lymanalpha (121.6 nm) and the Herzberg continuum (∼200– 220 nm wavelength range). Because the nowcasting of the neutral and ionic state of the middle atmosphere requires the solar irradiance for the wide spectral range (120–680 nm) we have developed the statistical tool for the reconstruction of the f...

Using the sunspot numbers reported during the Maunder minimum and the empirical relations between the mode frequencies and solar activity indices, the variations in the total solar irradiance and 10.7 cm radio flux for the period 1645 to 1715 is estimated. We find that the total solar irradiance and radio flux during the Maunder minimum decreased by 0.19% and 52% respectively, as compared to th...

Context. A recent paper by Shapiro and colleagues (2011, A&A, 529, A67) reconstructs spectral and total irradiance variations of the Sun during the holocene. Aims. In this note, we comment on why their methodology leads to large (0.5%) variations in the solar TSI on century-long time scales, in stark contrast to other reconstructions which have <∼0.1% variations. Methods. We examine the amplitu...

Solar irradiance data are crucial to PV system performance analysis. Although lightmeters (or pyranometers) have been applied in utility-level solar farms, they are not economically feasible for commercial/residential-level solar sites. Publicly accessible data, such as meteorological satellite imagery, are potentially an ideal source to meet the emerging demand. This research applied satellite...

For this study, we compared the spectral and integrated irradiance computed by high-resolution and moderate-resolution radiative transfer models (FASE and MODTRAN). It was found that the spectral resolution of a top of the atmosphere solar irradiance, coupled with the spectral resolution of the model used to compute the atmospheric transmittance, can influence the calculation of integrated sola...

We propose an ultra-short-term dynamic interval predictor (DIP) of solar irradiance. Our DIP relies on experimentally observed correlations between the derivative of the solar irradiance and the forecast error in the next time-step. The main originalities of this DIP are (i) its independence from the method used for the point forecast of solar irradiance, (ii) its independence from the error di...

We examine possible links between solar cycle irradiance variations the large atmospheric circulation systems that affect whole planet’s climate. In particular we examine the putative mechanism of solar forcing mediated by changes in induced stratospheric conditions over the polar regions. We test this hypothesis by examining causal links between time series of solar irradiance based on both am...

Herein we adopt a multiscale dynamical spectral analysis technique to compare and study the dynamical evolution of the harmonic components of the overlapping ACRIMSAT/ACRIM3 (Active Cavity Radiometer Irradiance Monitor Satellite/Active Cavity Radiometer Irradiance Monitor 3), SOHO/VIRGO (Solar and Heliopheric Observatory/Variability of solar Irradiance and Gravity Oscillations), and SORCE/TIM (...

The Total Irradiance Monitor (TIM) instrument is designed to measure total solar irradiance with an absolute accuracy of 100 parts per million. Four electrical substitution radiometers behind precision apertures measure input radiant power while providing redundancy. Duty cycling the use of the radiometers tracks degradation of the nickel-phosphorous absorptive black radiometer interiors caused...

Accurately predicting global solar irradiance is indispensable for smart management of electric grids.