globaalisäteily
Globaalisäteily, known in English as global solar radiation or global horizontal irradiance (GHI), is the total amount of short‑wave solar energy received per unit area on a horizontal surface. It is measured in watts per square metre (W/m²) and represents the sum of direct beam radiation from the sun and diffuse radiation scattered by the Earth's atmosphere. GHI is a key parameter in solar energy forecasting, climatology, and agricultural planning, as it directly influences the performance of photovoltaic systems, solar thermal collectors, and the natural light environment for plants.
The measurement of globaalisäteily is typically carried out using pyranometers, instruments that capture solar irradiance over
Globaalisäteily varies with geographic location, altitude, cloud cover, atmospheric composition, and the angle of the sun
Applications of globaalisäteily extend beyond power generation. It is used to calibrate climate models, assess risk