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Sun photometer CIMEL 318A in Tõravere
A Sun photometer is a type of photometer conceived in such a way that it points at the Sun. Recent sun photometers are automated instruments incorporating a Sun-tracking unit, an appropriate optical system, a spectrally filtering device, a photodetector, and a data acquisition system. The measured quantity is called direct-sun radiance.
When a Sun-photometer is placed somewhere within the Earth's atmosphere, the measured radiance is not equal to the radiance emitted by the Sun (i.e. the solar extraterrestrial radiance), because the solar flux is reduced by atmospheric absorption and scattering. Therefore, the measured radiant flux is due to a combination of what is emitted by the Sun and the effect of the atmosphere; the link between these quantities is given by Beer's law.
The atmospheric effect can be removed with Langley extrapolation; this method therefore allows measuring the solar extraterrestrial radiance with ground-based measurements. Once the extraterrestrial radiance is known, one can use the Sun photometer for studying the atmosphere, and in particular for determining the atmospheric optical depth. Also, if the signal at two or more suitably selected spectral intervals is measured, one can use the information derived for calculating the vertically integrated concentration of selected atmospheric gases, such as water vapour, ozone, etc.
A Sunphotometer is a type of photometer conceived in such a way that it points at the Sun. Recent sunphotometers are automated instruments incorporating...
repeated measurements with a Sunphotometer operated at a given location for a cloudless morning or afternoon as the Sun moves across the sky. It is named...
absorption. The optical depth of the atmosphere can be measured with a Sunphotometer. The optical depth with respect to the height within the atmosphere...
Centrifugal Particle Mass Analyser (CPMA) Remote sensing approaches include: Sunphotometer Lidar Imaging spectroscopy Particles can deposit in the nose, mouth...
during ex-hurricane Ophelia: observations from the new UK lidar and sun-photometer network". Atmospheric Chemistry and Physics. 19 (6). Copernicus Publications:...
international space station. In December 2015, the SSTL developed a Sunphotometer as part of the NASA Aerosol Robotic Network (AERONET), which measures...
University; the flight hardware was built by Ball Aerospace. Multiband Imaging Photometer for Spitzer (MIPS) Three detector arrays in the mid- to far-infrared (128...
the AERONET (AErosol RObotic NETwork) is a network of ground-based sunphotometers which measure atmospheric aerosol properties. The measurement system...
Thickness from the GOCART Model and Comparisons with Satellite and SunPhotometer Measurements". Journal of the Atmospheric Sciences. 59 (3): 461–483...
emissions by the Sun An Ultraviolet Spectrometer, which performs a vertical profile of the concentration of nitric oxide The auroral photometer (AP) is a two-channel...
stars (similar to the Sun) on or near the main sequence. The observed area corresponds to about 0.25% of the entire sky. The photometer is sensitive to wavelengths...
than 30 km height. Measurement of atmospheric turbidity was done using SunPhotometer with filters of 500 nm & 560 nm. VLF Propagation Studies VLF propagation...
Ultraviolet Photometer, two 50 MHz DFR antennas, a 423 MHz DFR antenna mounted on the end of one of the solar panels, and a deployable Sun-shade on the...
calibrators for the instrument variability. XPS (XUV Photometer System) was a 3.6 kg, 9 watts photometer which invoked filters to monitor the X-ray and UV...
publish a study on black carbon using the global network of AERONET sunphotometers. While the location of the AERONET instruments did not represent a...
roof of the nearby science building also hosts an automatic Sunphotometer and lunar photometer as part of the NASA AERONET network, a scanning infrared...
astronomical data on stars, and new technologies such as the photoelectric photometer allowed astronomers to accurately measure the color and luminosity of...
against the comparatively dark sky background, even in full daylight. The photometer field of view must be well baffled to avoid interference from the very...
incident light to pass through. In another example, sold as Heyde's Aktino-Photometer starting from the early 1900s, the photographer views the scene through...
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