The influence of geomagnetic activity on the subauroral mesopause temperature over Yakutia
2017 August 16
Regular observations of the hydroxyl emission band (6-2) were carried out at the Maimaga station (63°N, 129,5°E) since 1999. Measurements were conducted with an infrared spectrograph. The monthly average residuals of OH(6-2) temperature after the subtraction of the mean seasonal variation were studied earlier. The residual temperature maximum follows peak of Ottawa 10.7 cm flux with 25 months delay was found. The effect of geomagnetic activity on the subauroral mesopause temperature was evaluated to find the possible reasons for the time lag. The rotational temperature data set comprises 2229 nightly averages which pass selection criteria. For the analysis was used Ap-index, which is indirectly dependent on the characteristics of the solar wind. The cross-correlation analyses showed connection between ОН(6-2) rotational temperature with the geomagnetic activity. The correlation coefficient R = 0.44 with a value p=0.95. It can be concluded that the correlation between monthly average residuals of OH(6-2) temperature and monthly average of Ap-index is significant for period from 1999 to 2013.