csphot: Cimel Sunphotometer

The Cimel sunphotometer (CSPHOT) is a multi-channel, automatic sun-and-sky scanning radiometer that measures the direct solar irradiance and sky radiance at the Earth’s surface. It takes measurements at predetermined discrete wavelengths in the visible and near-infrared parts of the spectrum to determine atmospheric transmission and scattering properties. The CSPHOT only operates during daylight (sun above horizon).


  • Fixed
  • AMF1
  • AMF2
  • AMF3

Related Publications


Michelsen HA, RP Bambha, and BW LaFranchi. 2018. Arctic Methane, Carbon Aerosols, and Tracers Study Field Campaign Report. Ed. by Robert Stafford, ARM Climate Research Facility. DOE/SC-ARM-18-017.

Sheesley RJ and CE Moffett. 2018. Characterizing Potential Radiative Forcing on the North Slope of Alaska Field Campaign Report. Ed. by Robert Stafford, ARM Climate Research Facility. DOE/SC-ARM-18-016.

Wang W, W Gong, F Mao, and Z Pan. 2018. "Physical constraint method to determine optimal overlap factor of Raman lidar." Journal of Optics, 47(1), 10.1007/s12596-017-0427-9.

Cristóbal J, J Jiménez-Muñoz, A Prakash, C Mattar, D Skoković, and J Sobrino. 2018. "An Improved Single-Channel Method to Retrieve Land Surface Temperature from the Landsat-8 Thermal Band." Remote Sensing, 10(3), 10.3390/rs10030431.


Chiu JC, Y Blanchard, P Hill, L Gregory, and R Wegener. 2017. DACCIWA Cloud-Aerosol Observations in West Africa Field Campaign Report. Ed. by Robert Stafford, ARM Climate Research Facility. DOE/SC-ARM-17-022.

Schwartz S, D Huang, and D Vladutescu. 2017. "High-resolution photography of clouds from the surface: Retrieval of optical depth of thin clouds down to centimeter scales." Journal of Geophysical Research: Atmospheres, 122(5), 10.1002/2016JD025384.
Research Highlight

Painemal D, J Chiu, P Minnis, C Yost, X Zhou, M Cadeddu, E Eloranta, E Lewis, R Ferrare, and P Kollias. 2017. "Aerosol and cloud microphysics covariability in the northeast Pacific boundary layer estimated with ship-based and satellite remote sensing observations." Journal of Geophysical Research: Atmospheres, 122(4), 10.1002/2016JD025771.
Research Highlight


Goss H. 2016. Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean (MARCUS) Backgrounder. Ed. by Rolanda Jundt, ARM Climate Research Facility. DOE/SC-ARM-16-055.

Kourtchev I, C Giorio, A Manninen, E Wilson, B Mahon, J Aalto, M Kajos, D Venables, T Ruuskanen, J Levula, M Loponen, S Connors, N Harris, D Zhao, A Kiendler-Scharr, T Mentel, Y Rudich, M Hallquist, J Doussin, W Maenhaut, J Bäck, T Petäjä, J Wenger, M Kulmala, and M Kalberer. 2016. "Enhanced Volatile Organic Compounds emissions and organic aerosol mass increase the oligomer content of atmospheric aerosols." Scientific Reports, 6(1), 10.1038/srep35038.

Niple ER, HE Scott, JA Conant, SH Jones, FJ Iannarilli, and WE Pereira. 2016. "Application of oxygen A-band equivalent width to disambiguate downwelling radiances for cloud optical depth measurement." Atmospheric Measurement Techniques, 9(9), amt-9-4167-2016, 10.5194/amt-9-4167-2016.

View All Related Publications