Temperature variation at mesopause levels during winter solstice at 78°N

摘要: Abstract Atmospheric temperatures from the polar mesopause are deduced spectrophotometric measurements of hydroxyl bands and lines in night airglow made at 78°N during December January 1980/81 1982/83. An overall mean temperature 220 K is found with a range 172 to 257 daily values. Several warm periods lasting 3–6 days may be due heat dissipated by gravity waves. One week consistently low was apparently connected stratospheric warming. Both datasets show warmer later than for early mid-December. The OH seems peak or just above mesopause. data also indicate that situated approx. 90 km an upper gradient 1 −1 indicating very shallow A superposed epoch analysis 19 consecutive 24-h reveals semidiurnal variation around winter solstice amplitude 5 K. No diurnal greater apparent. Average wind velocity 9 m s .