Department of Aeronautics and Astronautics: Recent submissions
Now showing items 22-24 of 503
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Quantifying the average and the likelihood of increases in space weather indices and in situ measurements during Solar Cycles 20–23
(International Journal of Space Science and Engineering, 2013-01)It is known that space weather harshly affects spacecraft performance, yet spacecraft operations and understanding the cause of anomalies can be challenging due to the complexity of environmental metrics. In this work, we ... -
First results on a new PIAA coronagraph testbed at NASA Ames
(SPIE - The International Society for Optical Engineering, 2009-01-01)Direct imaging of extrasolar planets, and Earth-like planets in particular, is an exciting but difficult problem requiring a telescope imaging system with 1010 contrast at separations of 100 mas and less. Furthermore, the ... -
Radio science measurements of atmospheric refractivity with Mars Global Surveyor
(American Geophysical Union, 2006-05-20)Radio occultation experiments with Mars Global Surveyor measure the refractive index of the Martian atmosphere from the surface to ~250 km in geopotential height. Refractivity is proportional to neutral density at low ...
