China's Green Space Lasers in Hawaii—What We Do Know, What We Don't
Mysterious beams of light that shot over the Hawaiian coast led some to speculate on their origin.
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Mysterious beams of light that shot over the Hawaiian coast led some to speculate on their origin.
In this article, MinusK explains why negative-stiffness vibration is a critical part of spacecraft engineering, and relates how they helped with NASA's ICESat-2, a satellite observing ice levels in Antartica.
The application of diffusion theory and Monte Carlo lidar radiative transfer simulations presented in Part I of this series of study suggests that snow depth can be derived from the first-, second- and third-order moments of the lidar backscattering pathlength distribution. These methods are now applied to the satellite ICESat-2 lidar measurements over the Arctic sea ice and land surfaces of Northern Hemisphere. Over the Arctic sea ice, the ICESat-2 retrieved snow depths agree well with co-located IceBridge snow radar measured values with a root-mean-square (RMS) difference of 7.8 cm or 29.2% ...
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