are located at about 36,000 kilometres above the equator.
orbit time is 24 hours exactly, so they effectively remain at the same
point over the Earth's surface.
ones that interest us are the Meteosat series which are over the equator
at approximately 0° longitude.
websites provide animations over the past few hours
about this later)
can take pictures at any time of day or night.
15 or 30 minutes)
is limited because of the distance of the satellite.
the image is distorted due to the angle from which it is taken
providers modify images to reduce distortion.
Images from geostationary
satellites can be available within 15 minutes of the picture being taken
fly 800 kilometres above the surface so give high resolution images.
make 14 orbits per day (approx 1 hr 42 mins each orbit) passing close to
one orbit and the next, the earth has rotated ~ 25°.
they are only able to look at the British Isles during two consecutive
orbits and then there is a gap of over 10 hours before they can look
at us again and therefore take only four useful images each day of a particular
satpics images might not be available for several hours after the pass
so are best used to see what happened, ie for 'de-briefing'.
resolution Polar Orbiter visual images can distinguish features as small
as 250 metres, so will show individual cumulus.