A high precision Solar Ultraviolet Spectral Irradiance Monitor for the wavelength region 120?400 nm

Solar Physics ◽  
1981 ◽  
Vol 74 (2) ◽  
pp. 521-530 ◽  
Author(s):  
M. E. VanHoosier ◽  
J.-D. F. Bartoe ◽  
G. E. Brueckner ◽  
D. K. Prinz ◽  
J. W. Cook
Keyword(s):  
High Precision ◽  
Wavelength Region ◽  
Spectral Irradiance ◽  
Solar Ultraviolet

A High Precision Solar Ultraviolet Spectral Irradiance Monitor for the Wavelength Region 120–400 nm

1981 ◽  
pp. 521-530
Author(s):  
M. E. Vanhoosier ◽  
J.-D. F. Bartoe ◽  
G. E. Brueckner ◽  
D. K. Prinz ◽  
J. W. Cook
Keyword(s):  
High Precision ◽  
Wavelength Region ◽  
Spectral Irradiance ◽  
Solar Ultraviolet

scholarly journals Irradiance Observations from the UARS/SUSIM and ATLAS/SUSIM Experiments

1994 ◽  
Vol 143 ◽  
pp. 72-72 ◽  
Author(s):  
Guenter Brueckner ◽  
Linton E. Floyd ◽  
Paul A. Lund ◽  
Dianne K. Prinz ◽  
Michael E. Vanhoosier
Keyword(s):  
Solar Spectrum ◽  
Daily Basis ◽  
Spectral Irradiance ◽  
Reference Channel ◽  
Term Stability ◽  
Long Term Stability ◽  
Solar Uv ◽  
Solar Ultraviolet ◽  
Better Than

The SUSIM (Solar Ultraviolet Spectral Irradiance Monitor) on board the UARS (Upper Atmosphere Research Satellite) has measured the solar UV output from 120 nm to 400 nm on a daily basis since October 1991. A reference channel records a solar spectrum semi-annually only to reduce the instrument degradation of this channel and to provide long-term stability marks. Four deuterium lamps are used at monthly, semi-annual and annual intervals to provide long term calibration of the instrument. A preliminary analysis of the long term stability of SUSIM-UARS indicates that the precision of the instrument should be better than a few percent. The repeatability of two scans is better than 0.2%. A simplified SUSIM instrument is flying on NASA’s ATLAS Spacelab missions anually to provide calibration points for the SUSIM-UARS.

The Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) experiment on board the Upper Atmosphere Research Satellite (UARS)

1993 ◽  
Vol 98 (D6) ◽  
pp. 10695 ◽  
Author(s):  
G. E. Brueckner ◽  
K. L. Edlow ◽  
L. E. Floyd ◽  
J. L. Lean ◽  
M. E. VanHoosier
Keyword(s):  
Upper Atmosphere ◽  
Spectral Irradiance ◽  
Solar Ultraviolet

scholarly journals Estimating solar ultraviolet irradiance (290-385 nm) by means of the spectral parametric models: SPCTRAL2 and SMARTS2

2000 ◽  
Vol 18 (11) ◽  
pp. 1382-1389 ◽  
Author(s):  
I. Foyo-Moreno ◽  
J. Vida ◽  
F. J. Olmo ◽  
L. Alados-Arboledas
Keyword(s):  
Solar Irradiance ◽  
Biological Effects ◽  
Stratospheric Ozone ◽  
Radiant Energy ◽  
Parametric Models ◽  
Spectral Irradiance ◽  
Atmospheric Composition ◽  
Relevant Variables ◽  
Ultraviolet Irradiance ◽  
Solar Ultraviolet

Abstract. Since the discovery of the ozone depletion in Antarctic and the globally declining trend of stratospheric ozone concentration, public and scientific concern has been raised in the last decades. A very important consequence of this fact is the increased broadband and spectral UV radiation in the environment and the biological effects and heath risks that may take place in the near future. The absence of widespread measurements of this radiometric flux has lead to the development and use of alternative estimation procedures such as the parametric approaches. Parametric models compute the radiant energy using available atmospheric parameters. Some parametric models compute the global solar irradiance at surface level by addition of its direct beam and diffuse components. In the present work, we have developed a comparison between two cloudless sky parametrization schemes. Both methods provide an estimation of the solar spectral irradiance that can be integrated spectrally within the limits of interest. For this test we have used data recorded in a radiometric station located at Granada (37.180°N, 3.580°W, 660 m a.m.s.l.), an inland location. The database includes hourly values of the relevant variables covering the years 1994-95. The performance of the models has been tested in relation to their predictive capability of global solar irradiance in the UV range (290–385 nm). After our study, it appears that information concerning the aerosol radiative effects is fundamental in order to obtain a good estimation. The original version of SPCTRAL2 provides estimates of the experimental values with negligible mean bias deviation. This suggests not only the appropriateness of the model but also the convenience of the aerosol features fixed in it to Granada conditions. SMARTS2 model offers increased flexibility concerning the selection of different aerosol models included in the code and provides the best results when the selected models are those considered as urban. Although SMARTS2 provide slightly worse results, both models give estimates of solar ultraviolet irradiance with mean bias deviation below 5%, and root mean square deviation close to experimental errors.Key words: Atmospheric composition and structure (transmission and scattering of radiation) - Meteorology and atmospheric dynamics (radiative process)

scholarly journals Characterisation of the Broadband Solar Ultraviolet Spectral Irradiance over Bangi, Malaysia

2019 ◽  
Vol 12 (3) ◽  
pp. 406-413
Author(s):  
Ohoud Aljawi ◽  
Nurul Shazana Abdul Hamid ◽  
Wan Mohd Aimran Wan Kamil ◽  
Nor Sakinah Mohamad
Keyword(s):  
Spectral Irradiance ◽  
Solar Ultraviolet

Absolute solar ultraviolet intensities and their variations with solar activity. I - The wavelength region 1750-2100 A

1976 ◽  
Vol 209 ◽  
pp. 935 ◽  
Author(s):  
G. E. Brueckner ◽  
J.-D. F. Bartoe ◽  
O. K. Moe ◽  
M. E. Vanhoosier
Keyword(s):  
Solar Activity ◽  
Wavelength Region ◽  
Solar Ultraviolet

scholarly journals Why is chlorophyll b only used in light-harvesting systems?

2018 ◽  
Vol 131 (6) ◽  
pp. 961-972 ◽  
Author(s):  
Atsushi Kume ◽  
Tomoko Akitsu ◽  
Kenlo Nishida Nasahara
Keyword(s):  
Solar Radiation ◽  
Absorption Spectra ◽  
Light Harvesting ◽  
Wavelength Region ◽  
Absorption Efficiency ◽  
Spectral Irradiance ◽  
Photon Flux ◽  
Terrestrial Plants ◽  
Short Wavelength Region ◽  
Diffuse Solar Radiation

Abstract Chlorophylls (Chl) are important pigments in plants that are used to absorb photons and release electrons. There are several types of Chls but terrestrial plants only possess two of these: Chls a and b. The two pigments form light-harvesting Chl a/b-binding protein complexes (LHC), which absorb most of the light. The peak wavelengths of the absorption spectra of Chls a and b differ by c. 20 nm, and the ratio between them (the a/b ratio) is an important determinant of the light absorption efficiency of photosynthesis (i.e., the antenna size). Here, we investigated why Chl b is used in LHCs rather than other light-absorbing pigments that can be used for photosynthesis by considering the solar radiation spectrum under field conditions. We found that direct and diffuse solar radiation (PARdir and PARdiff, respectively) have different spectral distributions, showing maximum spectral photon flux densities (SPFD) at c. 680 and 460 nm, respectively, during the daytime. The spectral absorbance spectra of Chls a and b functioned complementary to each other, and the absorbance peaks of Chl b were nested within those of Chl a. The absorption peak in the short wavelength region of Chl b in the proteinaceous environment occurred at c. 460 nm, making it suitable for absorbing the PARdiff, but not suitable for avoiding the high spectral irradiance (SIR) waveband of PARdir. In contrast, Chl a effectively avoided the high SPFD and/or high SIR waveband. The absorption spectra of photosynthetic complexes were negatively correlated with SPFD spectra, but LHCs with low a/b ratios were more positively correlated with SIR spectra. These findings indicate that the spectra of the photosynthetic pigments and constructed photosystems and antenna proteins significantly align with the terrestrial solar spectra to allow the safe and efficient use of solar radiation.

Measurements of thermospheric molecular oxygen from the Solar Ultraviolet Spectral Irradiance Monitor

2007 ◽  
Vol 112 (D16) ◽  
Author(s):  
J. D. Lumpe ◽  
L. E. Floyd ◽  
L. C. Herring ◽  
S. T. Gibson ◽  
B. R. Lewis
Keyword(s):  
Molecular Oxygen ◽  
Spectral Irradiance ◽  
Solar Ultraviolet
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