A femtosatellite, or femtosat, is a satellite with a mass of less than 100 grams. Compared to other orbit perturbations, Solar radiation pressure (SRP) has a relatively significant influence on the orbits of these very small satellites. Groups, or swarms, of orbiting radiation pressure barometer spheres (ORBS) could be released with identical inertial and magnetic properties, but with different...

[1] A statistically significant atmospheric signal, which represents the influence of solar radiation changes on our climate, is found in global data (1958–2003). Using a nonlinear, nonstationary time series analysis, called empirical mode decomposition, it is shown that atmospheric temperatures and geopotential heights are composed of five global oscillations and a trend. The fourth mode is sy...

Solar radiation is an important input for various land-surface energy balance models. Global solar radiation data retrieved from the Japanese Geostationary Meteorological Satellite 5 (GMS-5)/Visible and Infrared Spin Scan Radiometer (VISSR) has been widely used in recent years. However, due to the impact of clouds, aerosols, solar elevation angle and bidirectional reflection, spatial or tempora...

Context: This work presents different models based on artificial neural networks, among them NNARX, for estimating global solar radiation from UV index measurements. The objective is to determine the efficiency of studied estimate in terms coefficient determination (R2), root-mean-square error (RMSE), and mean absolute (MAE). Methodology: It divided into four stages: i) conformation training da...

Solar radiation models for predicting the average daily and hourly global radiation, beam radiation and diffuse radiation are reviewed in this paper. Seven models using the Ångström– Prescott equation to predict the average daily global radiation with hours of sunshine are considered. The average daily global radiation for Hong Kong (22.3 N latitude, 114.3 E longitude) is predicted. Estimations...