25 Years Ago SOLAR Project Stormfury 1967 UV RADIATION INSTRUMENTATION New rules for seeding should permit a stepped-up pace of Hurricane experimentation in Project Stormfury for 1967. Since the program began in 1961 experi- ments have been performed on just two storms— hurricane Esther in 1961 and hurricane Beulah in 1963—with inconclusive results. In past years seed- ing has been restricted to a prescribed area—a band in the southwestern North Atlantic between Bermuda and Puerto Rico. This year, any suitable storm in the southwestern North Atlantic will be eligible for seeding, as long as there is no more than a 10% probability of its center approaching within 50 mi (80.5 km) of a populated area within 24 hr. This change in criteria was made possible by the increasing accuracy of hurricane fore- casts, particularly predictions of hurricane motion. The change should permit seeding experiments to be conducted in a greater number of storms. There are two primary reasons for the seeding restriction. Inasmuch as the effects of these experi- ments are expected to disappear within 24 hr after seeding, a storm will have reverted to "nature's own" before affecting a land mass. Second, marked changes in the structure of hurricanes occur when the storm passes over land and tend to obscure any effects produced by seeding. In the 1967 experiments, first priority is being given to multiple seeding of the eyewall clouds over an 8-hr The UVB-1 Pyranomefer is a precision period in an appropriate hurricane. Another experi- mefeorologica l insfrument for the measure- ment calls for seeding spiral rainbands to determine ment of biologically effective solar ultraviolet- whether their modification will cause a measurable B (UV-B) radiation. A thermally stabilized UV- change in the storm's mechanism. sensitive fluorescent phosphor converts the UV-B light to visible light which is then measured by a solid-state photodetector. The UVB-1 is a rugge d instrument designed to en- sure stability during long-term, unattended operatio n in fiel d stations. UV-A Pyranomefer 50 Years Ago model s are also available. Specification s • Spectral Response: 280 to 330 nm New York—Detroit—Los Angeles Meeting, • Cosine Response: ±5 % for 0°-60 ° zenith angle • Sensitivity: 2.5 V/(watt • m"2) of effective UV-B Week of Jan. 27 irradianc e • Power Requirement: 115/230 VAC or ±12 VDC • Temperature Range: -40° C to +40°C. Internal monitor The Institute of the Aeronautical Sciences has thermistor provided invited the Society to meet jointly with it in simulta- neous identical sessions at three cities. Members of the Society who would like to present a paper at any of the three cities (to be presented by proxy at the others) YANKE E ENVIRONMENTAL SYSTEMS, INC. P.O. Box 746 • Montague Industrial Park are invited to communicate with the Secretary as soon Turner s Falls, M A 01376 USA TEL:(413)863-0200«FAX( 4 131863-0255 as possible. • WRITE, PHONE, OR FAX FOR BULLETIN UVB-1 S 1494 Vol. 73, No. 9, September 1992
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Sep 1, 1992
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