Abstract: Aerosol optical depth measurements based on the attenuation of direct solar radiation before and after the six major explosive eruptions of Mt. St. Helens during 1980 are presented. These automated measurements are from a ...

Abstract: Sunphotometry is a common technique for characterizing aerosol properties. Photometers used for these measurements have a series of narrow-band filters that are chosen to avoid molecular absorption features, except for the ...

Abstract: Thermopile pyranometers? thermal offset has been recognized since the pyranometer?s inception. This offset is often overlooked or ignored because its magnitude is small compared to the overall solar signal at higher ...