EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Direct comparison of sporadic E from COSMIC-2 radio occultation and vertical wind shears from ICON/MIGHTI

Yosuke Yamazaki1, Christina Arras1, Satoshi Andoh2, Yasunobu Miyoshi3, Hiroyuki Shinagawa4, Brian J. Harding5, Christoph R. Englert6, Thomas J. Immel5, Sahar Sobhkhiz-Miandehi1,7, and Claudia Stolle8
Yosuke Yamazaki et al.
  • 1GFZ German Research Centre for Geosciences, Potsdam, Germany (
  • 2Graduate School of Science, Kyoto University, Kyoto, Japan
  • 3Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan
  • 4National Institute of Information and Communication Technology, Tokyo, Japan
  • 5Space Sciences Laboratory, University of California, Berkeley, Berkeley, CA, USA
  • 6Space Science Division, U.S. Naval Research Laboratory, Washington, DC, USA
  • 7Faculty of Science, University of Potsdam, Potsdam, Germany
  • 8Leibniz Institute of Atmospheric Physics at the University of Rostock, Kühlungsborn, Germany

The formation of a sporadic-E (Es) layer at mid and low latitudes is generally attributed to the vertical wind shear, which is predicted to cause vertical ion convergence. According to wind shear theory, a negative shear of the eastward wind is effective in converging metallic ions into a thin layer to produce Es. However, the direct comparison of Es with the local wind shear has been limited due to the lack of neutral wind measurements. This study examines the role of the vertical wind shear for Es, using signal-to-noise ratio profiles from COSMIC-2 radio occultation measurements and concurrent measurements of neutral wind profiles from the Ionospheric Connection Explorer (ICON). We find that the Es occurrence rate is correlated with the negative vertical shear of the eastward wind, providing observational support for the wind shear theory.

How to cite: Yamazaki, Y., Arras, C., Andoh, S., Miyoshi, Y., Shinagawa, H., Harding, B. J., Englert, C. R., Immel, T. J., Sobhkhiz-Miandehi, S., and Stolle, C.: Direct comparison of sporadic E from COSMIC-2 radio occultation and vertical wind shears from ICON/MIGHTI, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-8954,, 2022.


Display file