Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26at...20..475k&link_type=abstract
Astronomical and Astrophysical Transactions, vol. 20, Issue 3, pp.475-481
Astronomy and Astrophysics
Astronomy
Solar Activity, Solar-Atmospheric Relations, Troposphere
Scientific paper
The structure of the relations between the geomagnetic activity variations represented by the mean āā index and the root mean square of temperature anomalies in the low troposphere for the years 1894-1979 is considered in the range of periods 2-30 years. The temperature anomaly data for the North Polar Cap were used, and also for latitudes 65, 40 and 20°. Frequency characteristics of the relations were obtained separately for January and July. The results have shown, that the high tightness of the relations is typical for the Polar Caps and especially for the periods of quasibiennial oscillations (QBO). The relation degrees for QBO decrease on transition to moderate and low latitudes. A scenario of QBO excitation based on the increase of meridional circulation form recurrence is suggested. An important role is played by the areas of baroclynic instability of the troposphere as sites of the tropospheric reaction on cyclic changes of the solar activity.
Kononovich V.. E.
Smirnov R. V.
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