Short-Period Variation of the Activity of Atmospheric Turbulence in the MLT Region over Langfang

Abstract

In this paper, we investigate the activity of atmospheric turbulence in the MLT region and the relationship between the activity of atmospheric turbulence and atmospheric wave activity. We use data from the Langfang MF radar (39.4∘N, 116.7∘E) from July 2019 to June 2020 and NRLMSIS 2.0 to calculate the parameters of atmospheric wave activity and atmospheric turbulence energy dissipation rate (ε). Atmospheric ε is modulated by different periods at different altitudes, and while there are 12 h and 24 h periods at all altitudes, the main period is different at different altitudes. A comparison of the ε with atmospheric tide activity shows that tides have an effect on ε, and the influence of tides on ε may be different at different altitudes. The pattern of variation in ε is similar to that of the atmospheric activity of the gravity wave, with both ε and the atmospheric activity of the gravity wave showing significant semi-annual variation.

Dual-Frequency, Dual-Mode Reconfigurable Digital Atmospheric Radar Receiver Design

“…Atmospheric radio radars, such as medium frequency radars [1,2], meteor radars [3], and MST radars [4], play a significant role in the study of the dynamics and coupling of middle atmosphere and ground weather. They contribute to understanding the physics of atmospheric motion and sudden weather processes, establishing high-precision and high-resolution atmospheric models [5][6][7].…”

“…In terms of receiver technology, reconfigurable digital receivers possess advantages such as high-speed data acquisition, real-time signal processing, and a general yet highly flexible hardware module [17][18][19], representing the cutting edge in the development of new-generation radar receiver technology. The reconfiguration technology of digital receivers mainly includes (1) enhancing the reconfigurability in the analog domain [20,21] and (2) improving the reconfigurability in the digital domain [22,23]. Enhancing the reconfigurability in the digital domain focuses on achieving digital frequency conversion and a variable data processing workflow, therefore offering greater flexibility and efficiency.…”