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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 5 | Copyright
Atmos. Chem. Phys., 18, 3363-3367, 2018
https://doi.org/10.5194/acp-18-3363-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 Mar 2018

Research article | 08 Mar 2018

Influence of geomagnetic activity on mesopause temperature over Yakutia

Galina Gavrilyeva and Petr Ammosov Galina Gavrilyeva and Petr Ammosov
  • Yu. G. Shafer Institute for Cosmophysical Research and Aeronomy SB RAS, 677098, Yakutsk, Russian Federation

Abstract. The long-term temperature changes of the mesopause region at the hydroxyl molecule OH (6-2) nighttime height and its connection with the geomagnetic activity during the 23rd and beginning of the 24th solar cycles are presented. Measurements were conducted with an infrared digital spectrograph at the Maimaga station (63°N, 129.5°E). The hydroxyl rotational temperature (TOH) is assumed to be equal to the neutral atmosphere temperature at the altitude of ∼ 87km. The average temperatures obtained for the period 1999 to 2015 are considered. The season of observations starts at the beginning of August and lasts until the middle of May. The maximum of the seasonally averaged temperatures is delayed by 2 years relative to the maximum of the solar radio emission flux (wavelength of 10.7cm), and correlates with a change in geomagnetic activity (Ap index). Temperature grouping in accordance with the geomagnetic activity level showed that in years with high activity (Ap>8), the mesopause temperature from October to February is about 10K higher than in years with low activity (Ap<=8). Cross-correlation analysis showed no temporal shift between geomagnetic activity and temperature. The correlation coefficient is equal to 0.51 at the 95% level.

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The study of the response of the upper atmosphere to changes in solar and geomagnetic activity is an important contribution to the study of the Earth's climate. Measurements showed that the change in the atmospheric temperature at an altitude of 87 km above Yakutia lags behind the maximum solar radiation by 2 years and correlates with a change in geomagnetic activity. The winter temperature is higher in the years of the geomagnetic activity maximum than in the years of the minimum.
The study of the response of the upper atmosphere to changes in solar and geomagnetic activity...
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