Temperature response to the June 2020 solar eclipse observed by FORMOSAT-7/COSMIC2 in the Tibet sector

Abstract

This study explores the response of atmospheric temperature to the annular solar eclipse at the summer solstice on 21 June 2020. The radio occultation (RO) technique of the FORMOSAT-7/COSMIC2 (F7/C2) mission observes the temperature in the troposphere and stratosphere. The RO observations show that the temperature decreases significantly (near 4 to 8 °C) between 5 and 8 km altitudes over the Tibetan Plateau area within the 80% obscuration during the eclipse. The tropopause temperature increases by ~ 2 to 5 °C over the same area. By contrast, the tropopause temperature decreases by ~ 4° to 5 °C over the Indian Ocean. The F7/C2 RO technique captured not only the sudden tropospheric cooling and stratospheric warming over Tibet during the eclipse but also the possible response over the Indian Ocean away from the greatest eclipse.

Convergence Effects on the Ionosphere During and After the Annular Solar Eclipse on 21 June 2020

“…The enhancement in the F 2 region was attributed to the downward diffusion (Figures 2a and 2b) due to the thermal contraction during the obscuration (Chen et al., 2013, 2015; Evans, 1965a, 1965b; Le et al., 2008; Muller‐Wodarg et al., 1998; Rishbeth, 1970; Sun et al., 2022). The enhanced f o F 2 behavior during the first half of the solar eclipse over Wuhan (Figure 3a) mainly agrees with the observations from Yeh et al.…”

Numerical Solution of the Atmospheric Perturbations Triggered by Persistent Lithospheric Vibrations

“…Changes in TECs exhibit period characteristics longer than ~5 min that is probably related to the atmospheric gravity waves [36,37]. Generations of the gravity waves are mainly referred to variations in temperature near the Earth's surface [38][39][40][41][42][43][44]. In contrast, changes of TECs with period characteristics shorter than ~5 min are probably caused by the acoustic waves [45,46].…”