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A Tapestry of Orbits (Paperback, Revised)
Loot Price: R1,355
Discovery Miles 13 550
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A Tapestry of Orbits (Paperback, Revised)
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Satellites as they cross the night sky look like moving stars,
which can be accurately tracked by an observer with binoculars as
well as by giant radars and large cameras. These observations help
to determine the satellite's orbit, which is sensitive to the drag
of the upper atmosphere and to any irregularities in the gravity
field of the Earth. Analysis of the orbit can be used to evaluate
the density of the upper atmosphere and to define the shape of the
Earth. Desmond King-Hele was the pioneer of this technique of orbit
analysis, and this book tells us how the research began, before the
launch of Sputnik in 1957. For thirty years King-Hele and his
colleagues at the Royal Aircraft Establishment, Farnborough,
developed and applied the technique to reveal much about the Earth
and air at a very modest cost. In the 1960s the upper-atmosphere
density was thoroughly mapped out for 100 to 2000 km, revealing
immense variation of density with solar activity and between day
and night. In the 1970s and 1980s a picture of the upper-atmosphere
winds emerged, and the profile of the pear-shaped Earth was
accurately charted. The number of satellites now orbiting the earth
is over 5000. This book is the story of how this inexpensive
research of their orbits developed to yield a rich harvest of
knowledge about the Earth and its atmosphere, in a scientific
narrative that is enlivened with many personal experiences.
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