EGU22-11044, updated on 28 Mar 2022
https://doi.org/10.5194/egusphere-egu22-11044
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Climatological distributions of mid-latitude trough region irregularities based on Swarm in situ measurements

Yiwen Liu1, Wenhao Xie1, Chao Xiong2,3, Ting Ye1, Yuhao Wang1, Xin Wan4, and Yueyan Cao1
Yiwen Liu et al.
  • 1Shangrao Normal University, School of Physics and Electronic Information, China (liuyiwen@whu.edu.cn)
  • 2Department of Space Physics, Electronic Information School, Wuhan University, 430072 Wuhan, China
  • 3Hubei Luojia Laboratory, 430079 Wuhan, China
  • 4Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, China

A large number of studies have confirmed the frequent occurrence of plasma irregularities in the mid-latitude ionospheric trough (MIT), but their distribution characteristics have not been fully understood. Based on the Swarm in situ plasma density measurements from 2014 to 2020, the diurnal, seasonal, solar activity and geomagnetic activity variations of the occurrence rate of MIT region irregularities are analyzed. The results show that for the irregularities with scale size of 7.5-75 km: (1) the geomagnetic activity has an obvious inhibitory effect on the formation of irregularities inside the MIT region, regardless of dayside or nightside. (2) The occurrence rate of irregularities inside MIT region during the day is significantly higher than that at night, and the difference between day and night is greater than the difference between the two walls at the same local time sector. (3) On the dayside, the highest and lowest occurrence rate appears in winter and summer, respectively; but on the nightside, the highest and lowest occurrence rate appears in equinoxes and winter, respectively. (4) On the nightside, it shows lower occurrence rate under high solar activity conditions, but no obvious solar activity effect is shown on the dayside occurrence rate. The above results of the seasonal dependence, geomagnetic activity inhibitory effect, and solar activity influnce are newly and important for understanding the behaviors of the plasma irregularities at MIT region.

How to cite: Liu, Y., Xie, W., Xiong, C., Ye, T., Wang, Y., Wan, X., and Cao, Y.: Climatological distributions of mid-latitude trough region irregularities based on Swarm in situ measurements, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-11044, https://doi.org/10.5194/egusphere-egu22-11044, 2022.