Monthly Archives: July 2008

How GPS Works

Global Positioning System satellites transmit signals to equipment on the ground. GPS receivers passively receive satellite signals; they do not transmit. GPS receivers require an unobstructed view of the sky, so they are used only outdoors and they often do … Continue reading

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Sirocco

Sirocco, scirocco, jugo or, rarely, siroc is a Mediterranean wind that comes from the Sahara and reaches hurricane speeds in North Africa and Southern Europe. It is known in North Africa by the arabic word qibli (قبلی i.e. “coming from … Continue reading

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Solar Winds

The solar wind is a stream of charged particles—a plasma—that are ejected from the upper atmosphere of the sun. It consists mostly of electrons and protons with energies of about 1 keV. These particles are able to escape the sun’s … Continue reading

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Chinook wind

Chinook winds, often just called chinooks, is now normally a reference to foehn winds in the interior West of North America, where the Canadian Prairies and Great Plains meet various mountain ranges, although the original usage is in reference to … Continue reading

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