Lightning return stroke current from magnetic and radiation field measurements

1970 ◽  
Vol 75 (27) ◽  
pp. 5143-5147 ◽  
Author(s):  
Martin A. Uman ◽  
D. Kenneth McLain
Keyword(s):  
Radiation Field ◽  
Field Measurements ◽  
Return Stroke

scholarly journals Polarity Asymmetry in Lightning Return Stroke Speed Caused by the Momentum Associated with Radiation

Atmosphere ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1642
Author(s):  
Vernon Cooray ◽  
Gerald Cooray ◽  
Marcos Rubinstein ◽  
Farhad Rachidi
Keyword(s):  
Radiation Field ◽  
Opposite Direction ◽  
Maximum Speed ◽  
Return Stroke ◽  
Positive Return

In positive lightning return strokes, the net momentum transported by the radiation field has the same direction as the momentum associated with electrons, whereas the momentum associated with electrons is in opposite direction to the momentum of radiation in negative return strokes. It is shown here that this polarity asymmetry could limit the maximum speed of positive return strokes with respect to the negative return strokes.

Radiation field measurements in the TAMU irradiation cell

1986 ◽  
Vol 96 (1-4) ◽  
pp. 5-8
Author(s):  
Michaele Brady ◽  
Theodore Parish ◽  
Carl Erdman
Keyword(s):  
Radiation Field ◽  
Field Measurements ◽  
Irradiation Cell

scholarly journals JSI TRIGA neutron and gamma field characterization by TLD measurements

2020 ◽  
Vol 225 ◽  
pp. 04034
Author(s):  
Klemen Ambrožič ◽  
Klaudia Malik ◽  
Barkara Obryk ◽  
Luka Snoj
Keyword(s):  
Radiation Field ◽  
Radiation Effects ◽  
Nuclear Reactor ◽  
Measurement Techniques ◽  
Field Measurements ◽  
Reactor Irradiation ◽  
Fission Chamber ◽  
Start Up ◽  
Gamma Field ◽  
Irradiation Facilities

A well characterized radiation field inside a research nuclear reactor irradiation facilities enables precise qualification of radiation effects to the irradiated samples such as nuclear heating or changes in their electrical or material properties. To support the increased utilization of the JSI TRIGA reactor irradiation facilities in the past few years mainly on account of testing novel detector designs, electronic components and material samples, we are working on increasing the neutron and gamma field characterization accuracy using various modeling and measurement techniques. In this paper we present the dose field measurements using thermo-luminescent detectors (TLD’s) with different sensitivities neutron and gamma sensitivities, along with multiple ionization and fission chamber. Experiment was performed in several steps from reactor start-up, steady operation and a rapid shutdown, during which the ionization and fission chamber signals were acquires continuously, while the TLD’s were being irradiated at different stages during reactor operation and after shutdown, to also capture response to delayed neutron and gamma field. The results presented in this paper serve for validation of JSI designed JSIR2S code for delayed radiation field determination, initial results of its application on the JSI TRIGA TLD measurements will also be presented.

scholarly journals Modified Transmission Line Model with a Current Attenuation Function Derived from the Lightning Radiation Field—MTLD Model

Atmosphere ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 249
Author(s):  
Vernon Cooray ◽  
Marcos Rubinstein ◽  
Farhad Rachidi
Keyword(s):  
Radiation Field ◽  
Electromagnetic Fields ◽  
Input Parameter ◽  
Inverse Transformation ◽  
Attenuation Curve ◽  
Return Stroke ◽  
Zero Crossing ◽  
Base Current ◽  
Stroke Models ◽  
A Current

In return strokes, the parameters that can be measured are the channel base current and the return stroke speed. For this reason, many return stroke models have been developed with these two parameters, among others, as inputs. Here, we concentrate on the current propagation type engineering return stroke models where the return stroke is represented by a current pulse propagating upwards along the leader channel. In the current propagation type return stroke models, in addition to the channel base current and the return stroke speed, the way in which the return stroke current attenuates along the return stroke channel is specified as an input parameter. The goal of this paper is to show that, within the confines of current propagation type models, once the channel base current and the return stroke speed are known, the measured radiation field can be used to evaluate how the return stroke current attenuates along the channel. After giving the mathematics necessary for this inverse transformation, the procedure is illustrated by extracting the current attenuation curve from the typical wave shape of the return stroke current and from the distant radiation field of subsequent return strokes. The derived attenuation curve is used to evaluate both the subsequent and first return stroke electromagnetic fields at different distances. It is shown that all the experimentally observed features can be reproduced by the derived attenuation curve, except for the subsidiary peak and long zero-crossing times. In order to obtain electromagnetic fields of subsequent return strokes that are in agreement with measurements, one has to incorporate the current dispersion into the model. In the case of first return strokes, both current dispersion and reduction in return stroke speed with height are needed to obtain the desired features.

Lightning return stroke current identification via field measurements

2002 ◽  
Vol 84 (1) ◽  
pp. 41-50 ◽  
Author(s):  
F. Delfino ◽  
R. Procopio ◽  
A. Andreotti ◽  
L. Verolino
Keyword(s):  
Field Measurements ◽  
Return Stroke
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