Nighttime Atmospheric Pressure Measurement at 80–110 km Altitude over Xi’an by GBAVTII
摘要
The upper atmosphere above the earth is of great value for studying the effect of the sun on the earth. Remote sensing methods of wind speed, temperature, concentration and other physical quantities in the upper atmosphere of the earth can provide a basis for studying and detecting the atmosphere of other planets such as Mars and Saturn. This paper utilizes the self-developed GBAVTII instrument to observe the imaging interference fringes of O2(0–1) night airglow at altitudes 80–110 km in the urban area of Xi’an, China (Altitude 457 m, Coordinates 34.23 °N, 109.01 °E). Through processes such as forward modeling, calibration, flat field correction, and inversion, the rotational spectral line temperature method is used to obtain the atmospheric temperature at an altitude of 94 km over Xi’an over the past four years, with a temperature measurement accuracy of 2 K. By converting the discrete volume emission rate (VER) of O2(0–1) night airglow into an integrated emission rate (IER), the column concentration range of O2(0–1) night airglow at altitudes 80–110 km over Xi’an over the past four years is determined to be between 1.5×104 cm−2 and 6.5×104 cm−2. The VER accuracy of GBAVTII for detecting O2(0–1) airglow is between 3.8% and 14.2%. Based on the ideal atmospheric pressure formula, the atmospheric pressure at altitudes 80–110 km over Xi’an detected by GBAVTII is estimated to be in the range of 10–11 Pa, resulting in a radiation dilution factor of 0.41. This indicates that the atmospheric pressure in this region is in the range of 10−12 to 10−11 Pa. The research and development of the GBVATII prototype, along with its detection technology, holds potential application value in fields such as space weather forecasting and near-space development.