Instrument : Cimel Sunphotometer (CSPHOT)

Instrument Categories
Aerosols, Radiometric

Picture of the Cimel Sunphotometer (CSPHOT)

General Overview

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. Measurements are taken at pre-determined discrete wavelengths in the visible and near-IR parts of the spectrum to determine atmospheric transmission and scattering properties. This instrument is weather-proof and requires little maintenance during periods of adverse weather conditions. It takes measurements only during daylight hours (sun above horizon).

For more details, see the External Data Center web page.

Output Datastreams

  • csphotalm : Cimel Sunphotometer (CSPHOT): almucantars sky radiance data
  • csphotalm1dubo : Cimel Sunphotometer (CSPHOT): Dubovik almucantar retrievals
  • csphotaot : Cimel Sunphotometer (CSPHOT): aerosol optical thickness data
  • csphotaotfilt : Cimel Sunphotometer (CSPHOT): aerosol optical thickness, filtered data
  • csphotaotfiltqa : Cimel Sunphotometer (CSPHOT): aerosol optical thickness, filtered quality assurance data
  • csphotpfn1 : Cimel Sunphotometer (CSPHOT): Aerosol phase functions derived from almucantar sky radiances
  • csphotpp : Cimel Sunphotometer (CSPHOT): principal planes data
  • csphotsize : Cimel Sunphotometer (CSPHOT): derived: aerosol size distributions

Primary Measurements

The following measurements are those considered scientifically relevant.


Eastern North Atlantic
ENAC1 Browse DataGraciosa Island, Azores, Portugal
North Slope Alaska
NSAC1 Browse DataCentral Facility, Barrow AK
Southern Great Plains
SGPC1 Browse DataCentral Facility, Lamont, OK
Tropical Western Pacific
TWPC1 Browse DataCentral Facility, Manus I., PNG
TWPC2 Browse DataCentral Facility, Nauru Island
TWPC3 Browse DataCentral Facility, Darwin, Australia
ARM Mobile Facility
FKBM1 Browse DataBlack Forest, Germany
GANM1 Browse DataGan Airport, Gan Island, Maldives
GRWM1 Browse DataGraciosa Island, Azores, Portugal
HFEM1 Browse DataShouxian, Anhui, China
MAOM1 Browse DataManacapuru, Amazonas, Brazil; AMF1
NIMM1 Browse DataNiamey, Niger
OLIM1 Browse DataOliktok Point, Alaska
PGHM1 Browse DataARIES Observatory, Nainital, Uttarkhand, India
PVCM1 Browse DataHighland Center, Cape Cod MA; AMF 1
SBSM1 Browse DataSteamboat Springs CO, Valley Site
TMPM1 Browse DataU. of Helsinki Research Station (SMEAR II), Hyytiala, Finland; AMF2


Laurie Gregory
(631) 344-2266

Laurie Gregory
(631) 344-2266

Connor Flynn
(509) 375-2041

Lynn Ma
(631) 344-3813

Richard Wagener
(631) 344-5886

Richard Wagener
(631) 344-5886

Brent Holben
(301) 614-6658