Sky-polarization data for volcanic and non-volcanic periods. Report for April-September 1986

Technical Report · Wed Oct 01 00:00:00 EDT 1986

OSTI ID:5312586

Longtin, D R; Volz, F E

Volz has monitored the Arago and Babinet neutral points at Lexington and Bedford, Mass. for the years 1968 to 1986. These data, along with measurements of turbidity, twilight color ratio, solar aureole, and cloud and snow cover, have been assembled into a data base and checked for error. The neutral-point data were then corrected for day-to-day variations in tropospheric turbidity and separated into groups that coincide with time periods of known volcanic influences and seasonal events. 3-D plots indicate that both the Arago and Babinet points were strongly affected by the presence of the El Chichon dust cloud; however, the features were not as pronounced as in the tropics. Measurements made after the El Chichon eruptions also suggest a movement of the neutral points after sunset which was not observed after the eruptions of Mt. Pelee in 1902 and Katmai in 1911. The present measurements did not show an effect from the eruptions of Fuego in 1971 and late 1974.

• Research Organization: Optimetrics, Inc., Burlington, MA (USA)
• OSTI ID: 5312586
• Report Number(s): AD-A-188862/7/XAB; OMI-180
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
54 ENVIRONMENTAL SCIENCES
TROPOSPHERE
TURBIDITY
VOLCANOES
ATMOSPHERIC CIRCULATION
AEROSOLS
CLOUD COVER
DATA BASE MANAGEMENT
EARTH ATMOSPHERE
LIGHT SCATTERING
POLARIZATION
PROGRESS REPORT
SEASONAL VARIATIONS
SKY
TROPICAL REGIONS
COLLOIDS
DISPERSIONS
DOCUMENT TYPES
MANAGEMENT
SCATTERING
SOLS
VARIATIONS
580202* - Geophysics- Volcanology- (1980-1989)
500100 - Environment
Atmospheric- Basic Studies- (-1989)