High-speed camera observations of negative ground flashes on a millisecond-scale

Microwave radio emissions of negative cloud-to-ground lightning flashes

Article history: Received 6 August 2012 Received in revised form 31 January 2013 Accepted 6 February 2013 We report preliminary results of a new observational study of microwave-frequency electromagnetic radiation that is emitted by lightning discharge processes. Radiation was observed with a ceramic patch antenna and a digital radio receiver tuned to a center frequency of 1.63 GHz and a bandwi...

Analysis of UV flashes of millisecond scale detected by a low‐orbit satellite

[1] The microsatellite Tatiana recently detected two scales of the UV flash duration: 1–4 ms and 10–64 ms. This paper studies the atmospheric electricity phenomena that can serve as a source for short‐millisecond‐range flashes. It is shown that UV flashes in the millisecond scale detected by Tatiana may be explained as generated by gigantic blue jets (GBJ). The influence of an assumed self‐cons...

High Speed Ground Transportation

Initiation and propagation of cloud-to-ground lightning observed with a high-speed video camera

Complete evolution of a lightning discharge, from its initiation at an altitude of about 4 km to its ground attachment, was optically observed for the first time at the Lightning Observatory in Gainesville, Florida. The discharge developed during the late stage of a cloud flash and was initiated in a decayed branch of the latter. The initial channel section was intermittently illuminated for ov...

High-Speed Smart Camera with High Resolution

High-speed video cameras are powerful tools for investigating for instance the biomechanics analysis or the movements of mechanical parts in manufacturing processes. In the past years, the use of CMOS sensors instead of CCDs has enabled the development of high-speed video cameras offering digital outputs, readout flexibility, and lower manufacturing costs. In this paper, we propose a high-speed...