Long-term decrease of mesospheric temperature, 1963-1995, inferred from radiowave reflection heights

Details Long-term decrease of mesospheric temperature, 1963-1995, inferred from radiowave reflection heights Long-term decrease of mesospheric temperature, 1963-1995, inferred from radiowave reflection heights

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..20.2059t&link_type=abstract

Advances in Space Research, Volume 20, Issue 11, p. 2059-2063.

Computer Science

Sound

29

Scientific paper

Reflection heights of 164 kHz radiowaves in the lower D region at the geographic coordinates 50N, 10E have been continuously monitored by an experimental configuration which has been kept unchanged over more than 30 years, thus providing the longest continuous and homogeneous time series of mesospheric data presently available (apart from NLC observations). A gradual but steady subsidence of the reflection heights since the 1960s had already earlier indicated a long-term change of the structure of the underlying mesosphere. Introducing a minimum of model assumptions, it is now possible to evaluate these data for the summer months (May through August) in terms of neutral air pressure at a fixed altitude of 81.8 km. Our present analysis achieves a clear separation of the long-term trend from a superimposed quasi 11-year solar cycle and provides evidence that during the period from 1963 till 1995 the column-mean temperature between the stratopause and 81.8 km has steadily decreased with a linear rate of about -0.6 K per year, in good agreement with the results derived by other authors from Lidar and rocket soundings.

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