Aeroelectric structures and turbulence in the atmospheric boundary layer
- 1Borok Geophysical Observatory of Shmidt's Institute of Physics of the Earth RAS, 152742 Borok, Yaroslavl, Russia
- 2Nizhny Novgorod State University, Radiophysics Faculty, 603024 Nizhny Novgorod, Russia
- 3Geophysical Research Department, Institute of Applied Physics RAS, 603950 Nizhny Novgorod, Russia
- 4Finnish Meteorological Institute, Erik Palmenin aukio 1, PL 503, 00101 Helsinki, Finland
Abstract. Complex electrical measurements with the use of sodar data show that electric field pulsation analysis is useful for electrodynamics/turbulence monitoring under different conditions. In particular, the number of aeroelectric structures (AES) generated per hour is a convenient measure of the turbulence intensity. During convectively unstable periods, as many as 5–10 AES form per hour. Under stable conditions, AES occasionally form as well, indicating the appearance of occasional mixing events reflected in the electric field perturbations. AES magnitudes under stable conditions are relatively small, except in special cases such as high humidity and fog. The analysis of electric field (EF) spectra gives additional useful information on the parameters of the atmospheric boundary layer and its turbulence. A rather sharp change in the spectrum slope takes place in the vicinity of 0.02 Hz under stable conditions. The characteristic slope of the spectrum and its change are reproduced in a simple model of EF formation.