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This study examines the effect of airflow orientation with respect to the strip active electrode on concentration of ozone and nitrogen dioxide produced in a planar generator based on the surface dielectric barrier discharge. The orientation of the airflow was tested in parallel and perpendicular with respect to the strips. It was found that in the investigated range of average discharge power, the ozone concentration increases approximately by 25% when airflow was oriented in parallel with respect to the strips in comparison with perpendicular orientation of the airflow. Similarly the increase of nitrogen dioxide concentration was observed for parallel orientation of the airflow with respect to the strips in comparison with the perpendicular orientation of the airflow. Within the range of wavelengths from 250 to 1100 nm, the changes of intensities of spectral lines associated with airflow orientation have been observed. A 3D numerical model describing ion trajectories and airflow patterns have also been developed.

Abstract. This article describes the equipment, and its advantages, used for in-situ ground measurements of thunderstorm phenomena using measuring cars. By using all-sky high-speed cameras, radio receivers, and electric field measurements, typical lightning discharges in the central Europe region have been characterized. Measurements of ionizing radiation during storms using a gamma spectrometer were also performed. At the ground level, no ionizing radiation originating in the storm cloud was detected even though during other experiments, using the same equipment at lower altitudes corresponding to the lower part of the storm clouds, ionizing radiation was detected. We showed that radio antennas with appropriately constructed receivers and all-sky high-speed cameras are devices that can significantly contribute to the understanding of processes taking place in the storm cloud during lightning discharges. On the contrary, measurements of the vertical electric field did not provide any new information about the processes occurring in the thunderclouds.