From a room off the kitchen — a sort of sun-room, though the blinds were drawn against the afternoon brightness — he could hear the sounds of television.
The sun-drenched "Seaside at Honfleur," from 1864, for example, presents a rocky beach as a sparkling field of dabs of tan and gray paint, with the afternoon brightness heightened by sailboats rendered as dark silhouettes.
They called these waves the pre-midnight brightness wave (PMBW) and the midnight brightness wave (MBW), respectively.
We conducted geomagnetically conjugate observations of 630-nm airglow for a midnight brightness wave (MBW) at Kototabang, Indonesia [geomagnetic latitude (MLAT): 10.0°S], and Chiang Mai, Thailand (MLAT: 8.9°N), which are geomagnetically conjugate points at low latitudes.
We suggest that the polarization electric field inside the observed midnight brightness wave in the southern hemisphere is projected to the northern hemisphere, causing the observed ionospheric height increase in the northern hemisphere.
"We started doing sky quality meter readings of the night sky brightness in 2006, and since then, the skies over Cherry Springs have been getting much brighter," Honis said.
More than 50% of the European Union's land area have less than 270 μcd/m2 night sky brightness.
Night sky brightness is a major source of noise both for Cherenkov telescopes as well as for wide-angle Cherenkov detectors.
We tested this prediction using visual night sky brightness estimates and luminance-calibrated, panchromatic all-sky imagery at 15 locations in and near the city.
That atlas, and the new study, define "light-polluted skies" as having a luminance of 14 or more microcandelas per square meter about 10% higher than normal night sky brightness levels.
In contrast to the results reported here, a similar study undertaken in Hong Kong as part of a Master's thesis did not find a dependence of the night sky brightness on cloud coverage [28].
