Published on October 5, 2007
Weather Satellites John Harris - Head of Geography - Radley College - UK [email_address] http://geography.radley.org.uk
Weather Satellites There are 2 main types of weather satellite 1. Geostationary 2. Polar Orbiting
Geo stationary satellites eg Meteosat located over the equator at a height of 36 000 km. remain stationary with respect to the Earth's surface. give continuous low detail images (good for animation).
located over the equator at a height of 36 000 km.
remain stationary with respect to the Earth's surface.
give continuous low detail images (good for animation).
Polar orbiting satellites eg NOAA lower altitude of 850km. orbit from pole to pole in about 100 minutes. more detailed but less continuous images. do not always fly over the same regions.
lower altitude of 850km.
orbit from pole to pole in about 100 minutes.
more detailed but less continuous images.
do not always fly over the same regions.
Types of image Satellites “see” the earth and clouds by sensing radiation. Radiation is measured at a variety of wavelengths especially: Visible and Infra-Red
How do we get the data? The image is transmitted back to the satellite and can then be received via a satellite dish. Weather mages are widely available on the web. The data is transmitted to a receiving station where it is decoded, coloured and coastlines added.
Visible images Visible images are detailed. Question: Where is it? What is it? Clue: this is a cold place, north of the Norwegian mainland… Answer: this shows ice bergs around the island of Spitzbergen. The lines are “cloud streets”
Infra-Red Dark areas are relatively warm . Lighter areas are relatively cold . Question Why are they so many clouds in equatorial regions? Answer This is where warm moist air is rising (convection) cooling and condensing to form clouds.
Countries and Coasts Countries, coastlines and colours can be added later to make it easier to interpret. Hurricane Mitch east of Florida, US A depression over Western Europe
Weather observations for UK over the past 24 hours including a map to view recent weather data, timeline and observations table
Zoom into new NASA satellite and aerial images of the Earth, updated every day.
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