Measurements
Solar radiation heats the Earth's surface and atmosphere, and is very important for determining the Earth's climate. Cloud cover and air pollution affect the amount of solar radiation that reaches the ground. A pyranometer measures the amount of radiation. Sunshine duration is derived from these measurements.
Background information and data sources
Background information and data sources
More measurement data is available via the chart builder, including hourly data. You can also use it to compare stations and measurement series.