How it works...
The heliograph
Insolation is when the Sun shines above the horizon on a given point of the Earth. This is measured by means of a helio-phano-graph, which consists of a spherical lens that concentrates the Sun’s rays on to a strip of special thermal paper that blackens when hit by the Sun’s rays that have been concentrated by the lens. The energy received from a given surface, instead, is called global radiation, and is measured with an instrument called pyranometer or solarimeter, and is expressed in calories per unit of time per surface unit.
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Specials
The hydrogeological risk
On the sides of watercourses are plains...
On the sides of watercourses are plains...
What is the weather like?
On a beautiful, sunny summer day you may...
On a beautiful, sunny summer day you may...
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METEOSAT European satellites
The first European meteorological satellite was launched in...
The first European meteorological satellite was launched in...
Weather over the Mediterranean Sea
The weather in the Mediterranean areas is generally...
The weather in the Mediterranean areas is generally...
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Many different types of soil
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Observing the Earth’s surface
Atmosphere and hydrosphere get in contact with rocks and minerals on...
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