Sentences with phrase «by observers on the ground»
Analyzing measurements of high - altitude airglow gathered by a satellite in 1992 and 1996 (years of maximum and minimum solar flare activity, respectively), the scientists found 11 cases where airglow, in theory, brightened enough to be seen by observers on the ground, they report in Geophysical Research Letters.
http://www.sciencemag.org/ Not exact matches
Many observers believe candidates would be on safe ground by attacking the Clean Power Plan as heavy - handed regulation.
The successful observers, instead, laid the sticks on the ground and propelled the nuts into their reach by a quick ballistic flipping movement.