Influence of geomagnetic activity on mesopause temperature over Yakutia
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...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-03-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/18/3363/2018/acp-18-3363-2018.pdf |
| Summary: | 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 ∼ 87 km. 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
10.7 cm), 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 10 K 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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| ISSN: | 1680-7316 1680-7324 |