Abstract

The error in irradiance measured with Sun-calibrated multichannel radiometers may be large when the solar zenith angle (SZA) increases. This could be particularly detrimental in radiometers installed at mid and high latitudes, where SZAs at noon are larger than 50° during part of the year. When a multiregressive methodology, including the total ozone column and SZA, was applied in the calculation of the calibration constant, an important improvement was observed. By combining two different equations, an improvement was obtained at almost all the SZAs in the calibration. An independent test that compared the irradiance of a multichannel instrument and a spectroradiometer installed in Ushuaia, Argentina, was used to confirm the results.

© 2005 Optical Society of America

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References

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  1. B. A. K. Hoiskar, R. Haugen, T. Danielsen, A. Kylling, K. Edvarsen, A. Dahlback, A. Johnsen, M. Blumthaler, J. Schreder, “Multichannel moderate-bandwidth filter instrument for measurement of the ozone-column amount, cloud transmittance, and ultraviolet dose rates,” Appl. Opt. 42, 3472–3479 (2003).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  3. J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
    [CrossRef]
  4. T. Ingold, C. Mätzler, C. Wehrli, A. Heimo, N. Kämpfer, R. Philipona, “Ozone column density determination from direct irradiance measurements in the ultraviolet performed by a four-channel precision filter radiometer,” Appl. Opt. 40, 1989–2003 (2001).
    [CrossRef]
  5. C. R. Booth, T. Mestechkina, J. H. Morrow, “Errors in the reporting of solar spectral irradiance using moderate bandwidth radiometers: an experimental investigation,” in Ocean Optics XII, J. S. Jaffe, ed., Proc. SPIE2258, 654–663 (1994).
    [CrossRef]
  6. A. Dahlback, “Measurements of biologically effective UV doses, total ozone abundance, and cloud effects with multichannel moderate bandwidth filter instruments,” Appl. Opt. 35, 6514–6521 (1996).
    [CrossRef] [PubMed]
  7. H. A. Fuenzalida, “Global ultraviolet spectra derived directly from observations with multichannel radiometers,” Appl. Opt. 37, 7912–7919 (1998).
    [CrossRef]
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    [CrossRef]
  9. S. Diaz, C. Booth, G. Deferrari, C. Camilion, J. Robertson, “Improving multichannel radiometer calibration and data quality,” in Atmospheric Radiation Measurements and Applications in Climate, J. E. Shaw, ed., Proc. SPIE4815, 90–96 (2002).
    [CrossRef]
  10. S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
    [CrossRef]
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    [CrossRef]
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    [CrossRef]

2003 (2)

2001 (1)

2000 (2)

J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
[CrossRef]

T. M. Thorseth, B. Kjeldstad, “Comparison of solar UV measurements performed with spectroradiometer and moderate bandwidth multichannel radiometer for different cloud conditions,” J. Geophys. Res. 105, 4809–4820 (2000).
[CrossRef]

1998 (1)

1996 (1)

1995 (1)

Armstrong, R.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Beaubien, A.

J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
[CrossRef]

Bigelow, D.

J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
[CrossRef]

Blumthaler, M.

Booth, C.

S. Diaz, C. Booth, G. Deferrari, C. Camilion, J. Robertson, “Improving multichannel radiometer calibration and data quality,” in Atmospheric Radiation Measurements and Applications in Climate, J. E. Shaw, ed., Proc. SPIE4815, 90–96 (2002).
[CrossRef]

Booth, C. R.

C. R. Booth, T. Mestechkina, J. H. Morrow, “Errors in the reporting of solar spectral irradiance using moderate bandwidth radiometers: an experimental investigation,” in Ocean Optics XII, J. S. Jaffe, ed., Proc. SPIE2258, 654–663 (1994).
[CrossRef]

C. R. Booth, T. B. Lucas, J. H. Morrow, C. S. Weiler, P. A. Penhale, “The United States National Science Foundation’s Polar Network for monitoring ultraviolet radiation,” in Ultraviolet Radiation in Antarctica: Measurements and Biological Effects, Vol. 62 of Antarctic Research Series, C. S. Weiler, P. A. Penhale, eds. (American Geophysical Union, 1994), pp. 17–37.
[CrossRef]

Booth, R.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Brunat, C.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Cabrera, S.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Camilion, C.

S. B. Diaz, D. Nelson, G. Deferrari, C. Camilion, “A model to extend spectral and multiwavelength UV irradiances time series. Model development and validation,” J. Geophys. Res., [Atmos.] 108, 4150 (2003).
[CrossRef]

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

S. Diaz, C. Booth, G. Deferrari, C. Camilion, J. Robertson, “Improving multichannel radiometer calibration and data quality,” in Atmospheric Radiation Measurements and Applications in Climate, J. E. Shaw, ed., Proc. SPIE4815, 90–96 (2002).
[CrossRef]

Casiccia, C.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Dahlback, A.

Danielsen, T.

Deferrari, G.

S. B. Diaz, D. Nelson, G. Deferrari, C. Camilion, “A model to extend spectral and multiwavelength UV irradiances time series. Model development and validation,” J. Geophys. Res., [Atmos.] 108, 4150 (2003).
[CrossRef]

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

S. Diaz, C. Booth, G. Deferrari, C. Camilion, J. Robertson, “Improving multichannel radiometer calibration and data quality,” in Atmospheric Radiation Measurements and Applications in Climate, J. E. Shaw, ed., Proc. SPIE4815, 90–96 (2002).
[CrossRef]

Diaz, S.

S. Diaz, C. Booth, G. Deferrari, C. Camilion, J. Robertson, “Improving multichannel radiometer calibration and data quality,” in Atmospheric Radiation Measurements and Applications in Climate, J. E. Shaw, ed., Proc. SPIE4815, 90–96 (2002).
[CrossRef]

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Diaz, S. B.

S. B. Diaz, D. Nelson, G. Deferrari, C. Camilion, “A model to extend spectral and multiwavelength UV irradiances time series. Model development and validation,” J. Geophys. Res., [Atmos.] 108, 4150 (2003).
[CrossRef]

Disterhoft, P.

J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
[CrossRef]

Edvarsen, K.

Fuenzalida, H.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Fuenzalida, H. A.

Gibson, J.

J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
[CrossRef]

Haugen, R.

Heimo, A.

Hoiskar, B. A. K.

Ingold, T.

Johnsen, A.

Kämpfer, N.

Kjeldstad, B.

T. M. Thorseth, B. Kjeldstad, “Comparison of solar UV measurements performed with spectroradiometer and moderate bandwidth multichannel radiometer for different cloud conditions,” J. Geophys. Res. 105, 4809–4820 (2000).
[CrossRef]

Kolinski, D.

J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
[CrossRef]

Kylling, A.

Lantz, K.

J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
[CrossRef]

Lovengreen, C.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Lucas, T. B.

C. R. Booth, T. B. Lucas, J. H. Morrow, C. S. Weiler, P. A. Penhale, “The United States National Science Foundation’s Polar Network for monitoring ultraviolet radiation,” in Ultraviolet Radiation in Antarctica: Measurements and Biological Effects, Vol. 62 of Antarctic Research Series, C. S. Weiler, P. A. Penhale, eds. (American Geophysical Union, 1994), pp. 17–37.
[CrossRef]

Mätzler, C.

Mestechkina, T.

C. R. Booth, T. Mestechkina, J. H. Morrow, “Errors in the reporting of solar spectral irradiance using moderate bandwidth radiometers: an experimental investigation,” in Ocean Optics XII, J. S. Jaffe, ed., Proc. SPIE2258, 654–663 (1994).
[CrossRef]

Morrow, J. H.

C. R. Booth, T. Mestechkina, J. H. Morrow, “Errors in the reporting of solar spectral irradiance using moderate bandwidth radiometers: an experimental investigation,” in Ocean Optics XII, J. S. Jaffe, ed., Proc. SPIE2258, 654–663 (1994).
[CrossRef]

C. R. Booth, T. B. Lucas, J. H. Morrow, C. S. Weiler, P. A. Penhale, “The United States National Science Foundation’s Polar Network for monitoring ultraviolet radiation,” in Ultraviolet Radiation in Antarctica: Measurements and Biological Effects, Vol. 62 of Antarctic Research Series, C. S. Weiler, P. A. Penhale, eds. (American Geophysical Union, 1994), pp. 17–37.
[CrossRef]

Nelson, D.

S. B. Diaz, D. Nelson, G. Deferrari, C. Camilion, “A model to extend spectral and multiwavelength UV irradiances time series. Model development and validation,” J. Geophys. Res., [Atmos.] 108, 4150 (2003).
[CrossRef]

Paladini, A.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Pedroni, J.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Penhale, P. A.

C. R. Booth, T. B. Lucas, J. H. Morrow, C. S. Weiler, P. A. Penhale, “The United States National Science Foundation’s Polar Network for monitoring ultraviolet radiation,” in Ultraviolet Radiation in Antarctica: Measurements and Biological Effects, Vol. 62 of Antarctic Research Series, C. S. Weiler, P. A. Penhale, eds. (American Geophysical Union, 1994), pp. 17–37.
[CrossRef]

Philipona, R.

Robertson, J.

S. Diaz, C. Booth, G. Deferrari, C. Camilion, J. Robertson, “Improving multichannel radiometer calibration and data quality,” in Atmospheric Radiation Measurements and Applications in Climate, J. E. Shaw, ed., Proc. SPIE4815, 90–96 (2002).
[CrossRef]

Rosales, A.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Schmid, B.

Schreder, J.

Slusser, J.

J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
[CrossRef]

Thorseth, T. M.

T. M. Thorseth, B. Kjeldstad, “Comparison of solar UV measurements performed with spectroradiometer and moderate bandwidth multichannel radiometer for different cloud conditions,” J. Geophys. Res. 105, 4809–4820 (2000).
[CrossRef]

Vernet, M.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Wehrli, C.

Weiler, C. S.

C. R. Booth, T. B. Lucas, J. H. Morrow, C. S. Weiler, P. A. Penhale, “The United States National Science Foundation’s Polar Network for monitoring ultraviolet radiation,” in Ultraviolet Radiation in Antarctica: Measurements and Biological Effects, Vol. 62 of Antarctic Research Series, C. S. Weiler, P. A. Penhale, eds. (American Geophysical Union, 1994), pp. 17–37.
[CrossRef]

Zagarese, H.

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

Appl. Opt. (5)

J. Geophys. Res. (2)

J. Slusser, J. Gibson, D. Bigelow, D. Kolinski, P. Disterhoft, K. Lantz, A. Beaubien, “Langley method of calibrating UV filter radiometers,” J. Geophys. Res. 105, 4841–4849 (2000).
[CrossRef]

T. M. Thorseth, B. Kjeldstad, “Comparison of solar UV measurements performed with spectroradiometer and moderate bandwidth multichannel radiometer for different cloud conditions,” J. Geophys. Res. 105, 4809–4820 (2000).
[CrossRef]

J. Geophys. Res., [Atmos.] (1)

S. B. Diaz, D. Nelson, G. Deferrari, C. Camilion, “A model to extend spectral and multiwavelength UV irradiances time series. Model development and validation,” J. Geophys. Res., [Atmos.] 108, 4150 (2003).
[CrossRef]

Other (4)

S. Diaz, C. Booth, G. Deferrari, C. Camilion, J. Robertson, “Improving multichannel radiometer calibration and data quality,” in Atmospheric Radiation Measurements and Applications in Climate, J. E. Shaw, ed., Proc. SPIE4815, 90–96 (2002).
[CrossRef]

S. Diaz, R. Booth, R. Armstrong, S. Cabrera, C. Casiccia, H. Fuenzalida, C. Lovengreen, A. Paladini, J. Pedroni, A. Rosales, H. Zagarese, C. Brunat, G. Deferrari, C. Camilion, M. Vernet, “Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments,” in Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, W. Gao, J. R. Herman, G. Shi, K. Shibasaki, J. R. Slusser, eds., Proc. SPIE4896, 106–113, (2003).
[CrossRef]

C. R. Booth, T. B. Lucas, J. H. Morrow, C. S. Weiler, P. A. Penhale, “The United States National Science Foundation’s Polar Network for monitoring ultraviolet radiation,” in Ultraviolet Radiation in Antarctica: Measurements and Biological Effects, Vol. 62 of Antarctic Research Series, C. S. Weiler, P. A. Penhale, eds. (American Geophysical Union, 1994), pp. 17–37.
[CrossRef]

C. R. Booth, T. Mestechkina, J. H. Morrow, “Errors in the reporting of solar spectral irradiance using moderate bandwidth radiometers: an experimental investigation,” in Ocean Optics XII, J. S. Jaffe, ed., Proc. SPIE2258, 654–663 (1994).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Stations of the IAI Network. Ten multichannel radiometers (GUV-511, Biospherical Instruments Inc.) have been installed in Central and South America and are being calibrated by one traveling reference radiometer.

Fig. 2
Fig. 2

Channels of the GUV-511. The radiometer has four moderate bandwidth interference filters (near 10 nm) centered at 305, 320, 340, and 380 nm, plus PAR (400–700 nm).

Fig. 3
Fig. 3

(a) Single calibration of GUV-9221 (Bariloche) against RGUV-9287 and (b) multiregressive calibration. A double line is observed in (a) and disappears in (b). Also, an improvement is observed in the slope (closer to 1) and offset (ordinate at the origin near 0).

Fig. 4
Fig. 4

Relative error, in absolute value, for single-regression and multiregressive calibration, GUV-9221 (Bariloche) against RGUV-9287.

Tables (5)

Tables Icon

Table 1 rms Error between SUV Irradiance and RGUV-9287 Calibrated Irradiancea

Tables Icon

Table 2 rms Irradiance Error in Percent for Each of the UV Channelsa

Tables Icon

Table 3 Error for calibration of GUV-9234 (Ushuaia) against RGUV-9287a

Tables Icon

Table 4 Error of GUV-9234 versus SUV-100 (Ushuaia) Instantaneous Valuesa

Tables Icon

Table 5 Error of GUV-9234 versus SUV-100 (Ushuaia) Hourly Averagea

Equations (4)

Equations on this page are rendered with MathJax. Learn more.

ln E S U V λ = a 1 ln E G U V λ + a 2 O 3 + a 3 f ( 90 - SZA ) + b ,
ln E S U V λ = c 1 ln E G U V 305 + c 2 ln E G U V 320 + c 3 ln E G U V 340 + c 4 ln E G U V 380 + c 5 f ( 90 - SZA ) + d ,
E S U V λ = e 1 E G U V 305 + e 2 E G U V 320 + e 3 E G U V 340 + e 4 E G U V 380 + e 5 f 1 ( 90 - SZA ) ,
ln E R G U V λ = f 1 ln E G U V 305 + f 2 ln E G U V 320 + f 3 ln E G U V 340 + f 4 ln E G U V 380 + f 5 f ( 90 - SZA ) + g ,

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