The optic meridional network in Yakutia: The method of mesopause temperature measurement

摘要

At the Institute of Cosmophysical Research and Aeronomy, a meridional network of stations has been created, the purpose of which is to monitor the state of the atmosphere at the height of hydroxyl emission (～87 km). The network covers arctic (Tiksi, 71.5 ° N, 129 ° E), subarctic (Maimaga, 63 ° N, 129.5 ° E) and middle (Neryungri, 56.39 ° N, 124.43 ° E) latitudes. Each station is equipped with a spectrograph with a highly sensitive InGaAs infrared photodiode measuring the OH (3-1) band. This paper presents the characteristics of spectrographs designed to measure the radiation intensity of the OH (3-1) band and determine the temperature from its rotational structure. An original technique for measuring the rotational temperature is described, based on minimizing the deviation of the recorded spectrum from the model by the least square method. Estimates of random and systematic errors showed that at a signal-to-noise ratio more than 20, the temperature measurement error is 2 K. Mutual calibration of the instruments showed that the difference in measurements lies within 2 K. The meridional network of stations is fully automated and controlled remotely via the Internet.