scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

STP12 Abstracts
Berlin, 12 - 16 July 2010
SCOSTEP Symposium 2010
The long-term variations of temperatures in the stratosphere-lower thermosphere and
electronic concentration in F2-region of ionosphere
Kazimirovsky Edward, Vergasova G. V., Polekh N. M., Chernigovskaia M. A., Kurkin V. I.,
Perevalova N. P.
Institute of Solar-Terrestrial Physics, Siberian Branch Russian Academy of Sciences
A lot of experimental results have confirmed the existence of detailed correlations between
the parameters of the ionosphere and atmosphere below. The middle atmosphere affects the
ionosphere with upwardly propagating waves. Using data of vertical radiosounding of the
ionosphere and temperature measurements at stratosphere heights (30 km) and in the lower
thermosphere (80 km), the interrelation of occurrence of fluctuations with the periods of
planetary waves in temperature variations at different heights and in variations of critical
frequency of layer F2 (foF2) in the conditions of a minimum of solar activity in 2006-2007
are investigated. The features of occurence of the common periodicities of the considered
wave structures are discussed. The statistically significant periods of fluctuations of
temperature in the stratosphere and mesosphere vary from 11days to 49 days while for foF2
periodograms there are also more high-frequency fluctuations with the periods in 8 days, 9
days and 10 days. The significant correlation between the occurrence of fluctuations with the
periods of planetary waves in variations of stratosphere/lower thermosphere temperatures and
foF2 is revealed. The similarity of periodic structures for the variations of considered
parameters is found: correlation coefficients between periodograms are positive and high (r>
0.8), especially in the winter, in December.