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 retired
TWPC2 Browse DataCentral Facility, Nauru Island retired
TWPC3 Browse DataCentral Facility, Darwin, Australia retired
ARM Mobile Facility
FKBM1 Browse DataBlack Forest, Germany retired
GANM1 Browse DataGan Airport, Gan Island, Maldives retired
GRWM1 Browse DataGraciosa Island, Azores, Portugal retired
HFEM1 Browse DataShouxian, Anhui, China retired
MAOM1 Browse DataManacapuru, Amazonas, Brazil; AMF1
NIMM1 Browse DataNiamey, Niger retired
OLIM1 Browse DataOliktok Point, Alaska
PGHM1 Browse DataARIES Observatory, Nainital, Uttarkhand, India retired
PVCM1 Browse DataHighland Center, Cape Cod MA; AMF 1 retired
SBSM1 Browse DataSteamboat Springs CO, Valley Site retired
TMPM1 Browse DataU. of Helsinki Research Station (SMEAR II), Hyytiala, Finland; AMF2
 retired = Originating instrument has been retired at this location


Laurie Gregory
Brookhaven National Laboratory
(631) 344-2266

Laurie Gregory
Brookhaven National Laboratory
(631) 344-2266

Connor Flynn
Pacific Northwest National Laboratory
(509) 375-2041

Lynn Ma
Brookhaven National Laboratory
(631) 344-3813

Richard Wagener
Brookhaven National Laboratory
(631) 344-5886

Richard Wagener
Brookhaven National Laboratory
(631) 344-5886

Brent Holben
NASA - Goddard Space Flight Center
(301) 614-6658