During eleventh Antarctic Expedition in Nov. 1991/March 1992 ____ was installed.
A. SODAR (SOnic Detection And Ranging)
B. Second Permanent Station 'Maitree'
C. First permanent station 'Dakshin Gangotri'
D. None of the above
Answer: A
Source:
11th Soviet Antarctic Expedition
The Eleventh Soviet Antarctic Expedition was an expedition by the Soviet Union to Antarctica based at Mirny Station.
The Expedition did research into; the climate, the state of the ionosphere, the northern lights, cosmic rays, the geomagnetic field, and the source of radio waves.
One major task of the Expedition was to relay meteorological information to Soviet whaling ships in the southern latitudes.
This expedition was the first Soviet expedition to use aqua-lungs in biological exploration. Explorations using this technology were made from December to March in the Antarctic summer of 1966/7.
The three months of work resulted in a large collection of animals which were presented to the Academy of Sciences of the USSR in Leningrad.
During eleventh Antarctic Expedition in Nov. 1991/March 1992 SODAR (SOnic Detection And Ranging)was installed.
SODAR (SOnic Detection And Ranging), also written as sodar, is a meteorological instrument used as a wind profiler to measure the scattering of sound waves by atmospheric turbulence. SODAR systems are used to measure wind speed at various heights above the ground, ae thermodynamic structure of the lower layer of the atmosphere.
Sodar systems are like radar (radio detection and ranging) and lidar (light radar) systems except that sound waves rather than radio or light waves are used for detection. Other names used for sodar systems include sounder, echo sounder and acoustic radar.