Modulations in the polar mesosphere summer echoes and associated atmospheric gravity waves

Details Modulations in the polar mesosphere summer echoes and associated atmospheric gravity waves Modulations in the polar mesosphere summer echoes and associated atmospheric gravity waves

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1437w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Dec. 1989, p. 1437-1440. Research supported by SERC.

Physics

19

Gravity Waves, Mesosphere, Particle Precipitation, Polar Regions, Radar Echoes, Doppler Effect, Eiscat Radar System (Europe), Signal To Noise Ratios, Summer, Very High Frequencies

Scientific paper

Mesospheric observations were made by the EISCAT VHF radar. On one occasion a relatively weak Polar Mesosphere Summer Echo (PMSE) was observed with its intensity varying with a period of about 27 minutes. Immediately below the PMSE layer an atmospheric gravity wave was observed, also with a period of about 27 minutes. The maximum intensity of the PMSE corresponded to the maximum upward velocity associated with the wave. Particle precipitation, adiabatic cooling due to the upward velocity and wave steepening and breaking at the mesopause may all play a role in causing PMSEs.

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