PHOTOMETER Any of a number of atmospheric phenomena which appear as luminous patterns in the sky. They do not directly cause adverse weather. They include halos, coronas. rainbows, and fogbows.
PHOTOMETER: Instrument that measures luminous intensity, luminous flux, light distribution or color.
ozone spectrophotometer"See Dobson spectrophotometer.
ozone"A nearly colorless gas, formula O3, molecular weight 48, that appears blue in the condensed phase or at high concentration, with a characteristic odor like that of weak chlorine.
Telephotometer A photometer that measures the received intensity of a distance light source. Telethermoscope A temperature telemeter.
Scientist measure ozone layer thickness by measuring how much ultraviolet radiation reaches the ground, using a Dobson ozone spectrophotometer. Ozone layer thickness is measured in Dobson units. The higher the number the thicker the ozone layer.
 See also: Meteor, Surface, Atmosphere, Pressure, Light
  
|
RSS
