Alexandru Dan Toma
Full Text PDF | insolation at Earth's surface, ultraviolet radiation, photosynthetically active radiation, water vapor, aerosols, Sun photometer.

Typically, the total amount of gases and particles in a column of atmosphere cannot be determined from measurements just at Earth's surface, by a single measurement essentially at the bottom of the atmosphere column. Balloons, airplanes, and rockets are all used to perform direct measurements in the atmosphere at altitudes up to and beyond the stratosphere. Satellite-based instruments provide global views, but it is difficult to infer surface and column distributions from space-based measurements, so such measurements must still be supplemented by ground-based measurements. Sun photometry is an important way of probing the atmosphere from the ground to measure the effects of the atmosphere on Sun radiation crossing through the atmosphere to Earth's surface. These indirect technique provide information about the entire atmosphere above the observer, not just the atmosphere that can be sampled directly close to Earth's surface.

Current Trends in Natural Sciences

ISSN (online) 2284-953X
ISSN (CD-ROM) 2284-9521
ISSN-L 2284-9521
Publisher University of Pitesti, EUP