Temperature data of the mesopause region, obtained for the period 1999-2016 at the Maimaga station (63.04°N, 129.51°E), were studied. Registration of spectra was carried out with the help of light-sensitive infrared spectrographs SP-50, recording the OH (6-2) band. The standard deviation of temperature σpw from its average monthly value after deduction of seasonal temperature course is accepted as a characteristic of planetary wave activity. There is a quasi two-year cycle of planetary wave activity. A correlation is observed between the activity of planetary waves and the F10.7cm index.
The temperature data of the mesopause region obtained for the period 2013-2018 at the station Maimaga (63.04° N, 129.51° E) was investigated. During the winter period of the 2014–2015 observation season, the characteristic of the internal gravity waves (IGW) activity σgw has lower values than in other seasons, and the average night temperature of the mesopause region, on the contrary, exceeds corresponding values in other seasons. For comparison, satellite data of temperature profiles obtained by EOS MLS (Aura) are given. After isolating and subtracting the contribution of the gravitational component from the EOS MLS temperature profiles for the region above the Maimaga station, the difference in the winter stratopause of the 2014-2015 season is noticeable. During this season, the winter stratopause has lower temperatures than in other seasons, taking into account the deduction of the contribution of temperature fluctuations due to IGW.
The temperature of the mesopause region (87 km) is monitored at the Maimaga station (63.04° N, 129.51° E) using the Shamrock (Andor) spectrograph recording the OH band (3, 1). The temperature data obtained for the seasons from 2013 to 2017 are investigated. Standard temperature deviations σgw corresponding to internal gravity waves are obtained. The seasonal variation of the gravitational component of standard deviations of temperature σgw observed at Maimaga station almost coincides for three observation seasons except for the 2014-2015 season. In this observation season, σgw has lower values in winter than in other seasons. In addition, in the 2014-2015 season, average monthly temperatures exceed similar values in other seasons.
Research of the seasonal change of mesopause temperature at height of nightglow of hydroxyl excited molecules and its correlation with geomagnetic activity during the 23 solar cycle is presented. An infrared digital spectrograph installed at the Maimaga station (63°N, 129.5°E) measured P-branches of the OH(6-2) band. The rotational temperature of OH emission (TOH) is assumed to be equal to the neutral atmosphere temperature at the altitude of ~87 km. The database of TOH comprises 2864 nightly average temperatures obtained from August 1999 to May 2015 is considered. The observation starts at the beginning of August and ends in the middle of May. It was revealed that the maximum flux of radio emission from the Sun with a wavelength of 10.7 cm is 2 years ahead of the maximum of seasonally averaged temperature. Temperature is correlated with a change of Ap-index which is a measure of geomagnetic activity. Nightly mean TOH were grouped in accordance with the geomagnetic activity level: the temperatures measured during years with a high activity (Ap> 8), and low activity (Ap <= 8). It was found that the mesopause temperature from October to February is higher by a factor of about ·10 K than during years with low activity (Ap <= 8). There is no dependence of the TOH on the level of geomagnetic activity in autumn and spring.
A new infrared spectrograph with high temporal resolution for observation of OH band (3–1) emission dynamics is described. For the automated work of the spectrograph, special software was created. Remote control over the device is also configured.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.