Electric field signatures of the IAR and Schumann resonance in the upper ionosphere detected by Chibis-M microsatellite

•Chibis-M microsatellite detected electric field signatures of the Ionospheric Alfven Resonator.•Ionospheric Alfven Resonator reveals itself in a harmonic spectral structure of ULF bursts.•Atmospheric Schumann resonances was confirmed to leak into the upper ionosphere.

We tried to find with the ULF/ELF electric field sensor onboard Chibis-M microsatellite signatures of the IAR (Ionospheric Alfvén Resonator) and Schumann resonance (SR) in the upper ionosphere. Whereas observations of the IAR and SR multi-band emissions with ground magnetometers are ubiquitous, in-situ satellite observations of their signatures are very rare. ULF events detected by the Chibis-M show a possibility of triggered excitation of IAR. In contrast to dominating view, IAR has been found to be effectively excited on the dayside, too. Chibis-M observations also supported the possibility of the SR leakage into the upper ionosphere.