Electric fields of initial breakdown in positive ground flash

construction of vector fields with positive lyapunov exponents

in this thesis our aim is to construct vector field in r3 for which the corresponding one-dimensional maps have certain discontinuities. two kinds of vector fields are considered, the first the lorenz vector field, and the second originally introced here. the latter have chaotic behavior and motivate a class of one-parameter families of maps which have positive lyapunov exponents for an open in...

Features of the Electric Fields Generated by Lightning with Special Attention to Positive Ground Flashes

Johari, D. 2017. Features of the Electric Fields Generated by Lightning with Special Attention to Positive Ground Flashes. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1588. 49 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0128-0. This thesis focuses on the main processes in positive ground flashes and the distant lightning e...

Measured electric and magnetic fields from an unusual cloud-to-ground lightning flash containing two positive strokes followed by four negative strokes

[1] We present electric and magnetic fields measured at multiple stations between about 300 and 800 m of a cloud-to-ground ‘‘bipolar’’ lightning flash containing two initial positive strokes, separated in time by 53 ms and striking ground at two locations separated by about 800 m, followed by four negative strokes that traversed the same path as the second positive stroke. The leader electric f...

Characteristics of Preliminary Breakdown Pulses in Positive Ground Flashes during Summer Thunderstorms in Sweden

This paper presents the characteristics of the preliminary breakdown pulses (PBP) in 51 positive ground flashes recorded during 2014 summer thunderstorms in Sweden. Electric field measurements were conducted remotely using a broadband antenna system (up to 100 MHz) for a recording length of 1 s with 200 ms trigger time. In the analysis, PBP trains were observed in 86% of the cases. Based on the...

Stress Fields and Electric Potential in Piezoelectric Cylinders