EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Polar Mesosphere Winter Echoes and their relation to infrasound

Evgenia Belova1, Johan Kero1, Sven Peter Näsholm2, Ekaterina Vorobeva2,3, Oleg A. Godin4, and Victoria Barabash5
Evgenia Belova et al.
  • 1Swedish Institute of Space Physics, Kiruna, Sweden (
  • 2NORSAR, Kjeller, Norway
  • 3Norwegian University of Science and Technology (NTNU), Faculty of Natural Sciences, Department of Physics, Norway
  • 4Naval Postgraduate School, Monterey, CA, USA
  • 5Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Division of Space Technology, Kiruna, Sweden

Polar Mesosphere Winter Echoes (PMWE) are radar echoes that originate from the mesosphere at 50-80 km altitude and are observed with VHF radars during equinox and winter seasons. Strong PMWE are relatively rare phenomena, in most cases they are observed when the lower ionosphere displays high ionisation. Interpretations of observational results concerning PMWE are controversial and the origin of the echoes is still under debate. Especially intriguing is that in some cases of strong PMWE, the measured horizontal speeds of the radar reflecting structures can exceed 300 m/s. Radar reflection (scattering) by infrasound waves at frequencies below about 2 Hz was suggested in order to explain these observations. We will give recent examples of PMWE events of high horizontal speed as observed with the 52 MHz MST radar (ESRAD) located at Esrange (68°N, 21ºE) in northern Sweden. Together with this we will analyse infrasound measurements made at ground-based stations near Kiruna (67.5°N, 20.13ºE) and at the infrasound station IS37 (69°N, 18ºE) in Norway during these events. We discuss prospective relations between PMWE and the microbaroms that are generated by ocean swell in the North Atlantic.

How to cite: Belova, E., Kero, J., Näsholm, S. P., Vorobeva, E., Godin, O. A., and Barabash, V.: Polar Mesosphere Winter Echoes and their relation to infrasound, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-5055,, 2020


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displays version 2 – uploaded on 20 May 2020, no comments
I added one more co-author and corrected a few errors in the text.
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