Results 201 to 210 of about 1,732,841 (212)

Preliminary breakdown pulses of cloud-to-ground lightning in winter thunderstorms in Japan

Journal of Atmospheric and Solar-Terrestrial Physics, 2013
Abstract Preliminary breakdown pulses (PBP) of 26 positive and 104 negative cloud-to-ground (CG) lightning flashes observed in winter thunderstorms in Hokuriku region of Japan are analyzed. Pulses in PBP train are mainly bipolar. Zero-crossing time of each pulse is about 7 us and total duration of each pulse train is about 1 ms.
Tomoo Ushio, Tsuyoshi Funaki, Satoru Yoshida   +2 more
exaly   +2 more sources

Preliminary Breakdown Pulses (PBP): A review on available data and models

Electric Power Systems Research
Lightning is a major risk for humans, animals, and electrical systems. Many researches focused on the fully developed events, such as the Return Stroke (RS) current, the emitted electromagnetic fields, and the phenomenon modeling. However, there is poor understanding regarding precursors, such as Preliminary Breakdown Pulses (PBP).
Renato Procopio, Daniele Mestriner, Alessandro Formisano   +2 more
exaly   +3 more sources

Propagation of preliminary breakdown pulses preceding cloud-to-ground lightning discharges

2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), 2015
A sequence of electromagnetic pulses lasting from a few milliseconds to several tens of milliseconds is usually observed prior to the first return stroke of a cloud-to-ground lightning flash. The sequence is composed of three parts. It begins with a group of relatively large bipolar pulses which are believed to be connected with preliminary breakdown ...
Thomas Farges, Steven Cummer, Ivana Kolmasova   +2 more
exaly   +2 more sources

Comparison of preliminary breakdown pulses observed in Sweden and in Sri Lanka

Journal of Atmospheric and Solar-Terrestrial Physics, 1998
Abstract In this paper we have analysed breakdown pulse trains preceding the first return stroke in 47 negative cloud-to-ground (CG) lightning flashes observed in Sri Lanka (tropics) and that in 41 negative CG flashes recorded in Sweden (temperate regions). In the data obtained in Sri Lanka, breakdown pulses could be detected only in nine flashes. In
Chandima Gomes
exaly   +2 more sources

PRELIMINARY EVIDENCE FOR SELF‐FOCUSING IN GAS BREAKDOWN PRODUCED BY PICOSECOND LASER PULSES

Applied Physics Letters, 1969
An investigation of the sparks produced by picosecond pulses from mode-locked Nd:glass and ruby lasers indicates the existence of breakdown regions of diameter less than 5 μ. These results support the hypothesis that self-focusing of the beam may be involved in the breakdown process.
A. J. Alcock, C. DeMichelis, V. V. Korobkin, M. C. Richardson   +3 more
exaly   +2 more sources

Statistical analysis on preliminary breakdown pulses in negative cloud-to-ground flashes occurred in Colombia

2021 35th International Conference on Lightning Protection (ICLP) and XVI International Symposium on Lightning Protection (SIPDA), 2021
Camilo A. Granados, Herbert E. Rojas, Francisco J. Roman   +2 more
exaly   +2 more sources

Comparative study on preliminary breakdown pulse trains observed in Malaysia and Florida

2010 30th International Conference on Lightning Protection (ICLP), 2010
In this paper, the preliminary breakdown pulse (PBP) trains preceding the negative first return strokes recorded using a broad band antenna system in Johor Bahru, Malaysia and Florida, United States were analyzed. In lightning flashes observed in Malaysia, the ratio between the amplitude of the largest preliminary breakdown pulse (PBP) and the peak ...
Z.A. Baharudin, Noor Azlinda Ahmad, M. Fernando, V. Cooray, J.S. Makela   +4 more
openaire   +1 more source

Comparative study on preliminary breakdown pulse trains observed in Johor, Malaysia and Florida, USA

Atmospheric Research, 2012
In this paper, the preliminary breakdown (PB) pulse train preceding the negative first return stroke (RS) is recorded using a broad band antenna system.
Z.A. Baharudin, Noor Azlinda Ahmad, M. Fernando, V. Cooray, J.S. Mäkelä   +4 more
openaire   +1 more source

Characteristic pulse trains of preliminary breakdown in four isolated small thunderstorms

Journal of Geophysical Research: Atmospheres, 2017
AbstractUsing a low‐frequency six‐station local network, preliminary breakdown (PB) pulses not followed or followed by negative return stroke (RS), which are defined as PB‐type and PB cloud‐to‐ground (PBCG)‐type flashes, are analyzed based on four isolated small thunderstorms for the first time.
openaire   +1 more source

Measurement of preliminary breakdown pulse trains in cloud-to-ground lightning using lightning locating systems

2014 International Conference on Lightning Protection (ICLP), 2014
The first stroke leader in a cloud-to-ground lightning discharge is thought to be preceded by the initial or preliminary breakdown process which produces a train of relatively large microsecond-scale electric field pulses. In addition to producing the information used to geolocate various types of lightning events (cloud-to-ground return strokes, M ...
Amitabh Nag, Vladimir A. Rakov, Martin J. Murphy   +2 more
openaire   +1 more source