EGU22-4057
https://doi.org/10.5194/egusphere-egu22-4057
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Global magnetic field oscillations on the breathing-mode timescale and their effects on energetic electron precipitation

Murong Qin1,2, Wen Li1, Qianli Ma1,3, Xiaochen Shen1, and Xiaochen Shen
Murong Qin et al.
  • 1Boston University, Boston, United States of America
  • 2Cooperative Programs for the Advancement of Earth System Science, UCAR, Boulder, Colorado, USA
  • 3Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA.

In this study, we present simultaneous multi-point observations of whistler-mode chorus waves and global magnetospheric oscillations on a timescale of several to ~10s minutes (breathing mode magnetic field oscillations), associated with concurrent energetic electron precipitation observed through enhanced BARREL X-rays. Similar fluctuations on a timescale of several to ~10s minutes are observed in the X-ray measurements and the compressional component of global oscillations. The spatial scale of global oscillations spans from 4 to 12 h in MLT and from 5 to 11 in L shell. Such global oscillations, which have been suggested to play a potential role in precipitating energetic electrons by either wave scattering or loss cone modulation, show high correlation with the enhancement in X-rays. However, the correlation coefficient between whistler-mode waves and X-rays is low. Observations and model results show that the breathing-mode magnetic field oscillations could play a significant role in modulating the electron precipitation driven by whistler-mode waves even though the whistler-mode wave intensity is not fully modulated by global oscillations.

How to cite: Qin, M., Li, W., Ma, Q., Shen, X., and Shen, X.: Global magnetic field oscillations on the breathing-mode timescale and their effects on energetic electron precipitation, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-4057, https://doi.org/10.5194/egusphere-egu22-4057, 2022.