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virtual height

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virtual height [′vər·chə·wəl ′hīt]
(geophysics)
The apparent height of a layer in the ionosphere, determined from the time required for a radio pulse to travel to the layer and return, assuming that the pulse propagates at the speed of light. Also known as equivalent height.
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Metallica are desperate not to be seen as control freaks, misers and bullies any more, and so Death Magnetic has come trumpeted by a fly-on-the-wall promotional website; and every track is available to download as part of Guitar Hero III, the video game which takes air guitar to new virtual heights.
Butter wouldn't melt Metallica by guardian.co.uk / guardian.co.uk
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