ANALYSIS: The Metallic Snow-Capped Mountains of Venus
The KONUS experiment consisted of six scintillation detectors, six devices for gamma-ray burst detection against the cosmic background, six counters, and a time analyzer.
These two missions, in spite of instrument failures, sent back valuable data. Veneras 11 and 12 both flew by Venus at a distance of about 22,000 miles, measuring the solar wind, gamma-ray bursts, ultraviolet radiation, and Venus' ionosphere. And both spacecraft's corresponding landers reached the surface in one piece and fared quite well, though in addition to the lens caps staying put the soil analysis experiment on both landers also failed.
Venera 11's lander lasted 95 minutes in Venus' oppressive climate and Venera 12's lander set a record after operating for 115 minutes. They found evidence of lighting and thunder, carbon monoxide low in Venus' atmosphere, and isotopes of argon that led scientists to reconsider the theory that the atmospheres of Venus, Earth, and Mars are all the result of volcanic outgassing.