Sun photometer SP1A for ground-based (Koldewey station) and air-borne (POLAR 4) activities

-    17-channel automatic Sun photometer  SP1A (spectral range: 0.351 - 1.062 mm)
-    field of view: 1 degree
-    full-width-half-maximum: 5 nm to 15 nm
-    measured value: direct radiance and irradiance
-    calibration: Langley procedure in the high mountain 
-    derived value: spectral aerosol optical depth
-    additional: brightness measurements  at 0.862 mm
 

more information on the Sun photometer SP1A: http://www.drschulz.com