Comparison of the upper atmosphere temperature obtained by ground-based and satellite instruments

TL;DR

This paper compares upper atmosphere temperature measurements from ground-based and satellite instruments, proposing a calibration method for ground instruments and analyzing data from 2017-2018 to improve measurement accuracy.

Contribution

It introduces a calibration approach for ground-based temperature measurements using satellite data and determines the relationship coefficients between the two methods.

Findings

Calibration coefficients: scale factor ~0.99, displacement ~120K.

Seasonal variation of ground-based and satellite measurements closely match.

Method improves accuracy of ground-based upper atmosphere temperature data.

Abstract

An approach is demonstrated for comparing the temperature of the upper atmosphere obtained by ground-based and satellite methods. A method for calibrating ground-based instruments (Fabry-Perot interferometer) based on the data obtained and determining the exact altitude at which the temperature was measured by ground-based means is proposed. Based on the assumption that the temperatures are connected in a linear fashion, the coefficients of the temperatures connection are determined by the least squares method. We use information on the temperature of the upper atmosphere for 2017-2018 obtained by the SABER TIMED and MLS Aura satellite instruments, and by the Fabry-Perot interferometer located at the Tory geophysical observatory of the ISTP of the SB RAS observing the 557.7 nm oxygen line, the emission height is ~ 100 km. The scale factor about 0.99 and the displacement coefficient about 120K were obtained for the temperature data using an interferometer at a height of 92 km for which the seasonal variation of the temperatures of the interferometer most closely corresponds to the seasonal variation of the temperatures obtained by SABER TIMED. The coefficients can then be used as calibration values for the interferometer.