Electromagnetic Model of K-Changes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F24%3A00599471" target="_blank" >RIV/68378289:_____/24:00599471 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/24:10492093

Result on the web

<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JD040503" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JD040503</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2023JD040503" target="_blank" >10.1029/2023JD040503</a>

Result language

angličtina

Original language name

Electromagnetic Model of K-Changes

Original language description

K-changes are observed as step-like increases in the thundercloud electric fields. The K-changes occur in the late part of intra-cloud lightning or during negative cloud-to-ground lightning between return strokes. It has been shown that the processes leading to K-changes initiate in the decayed part of a positive leader channel and propagate toward the flash origin. They are often accompanied by microsecond-scale electric field pulses. We introduce a new model to simulate processes leading to the K-changes in cloud-to-ground lightning. Our method is based on the full solution of Maxwell's equations coupled to Poisson's equation for the thundercloud charge structure. To model the K-changes, we gradually increase the decayed channel conductivity. The modeled current wavefront propagates due to the K-processes downward along a vertical channel and completely attenuates before reaching the ground. We derive the evolution of the linear charge densities and the scalar electric potential along the channel leading to K-changes. We model electrostatic step-like changes in the measured electric field together with the approximate rates and amplitudes of the microsecond scale pulses. Step-like changes increase their amplitudes with the length of the simulated channel and with a higher conductivity of the channel. The microsecond-scale pulse waveshapes depend mainly on the propagation velocity of the current wave, and the time scale of the conductivity increase. We show that our modeled waveforms are in a good agreement with observations conducted in Florida.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Geophysical Research-Atmospheres

ISSN

2169-897X

e-ISSN

2169-8996

Volume of the periodical

129

Issue of the periodical within the volume

20

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

e2023JD040503

UT code for WoS article

001331266300001

EID of the result in the Scopus database

2-s2.0-85206848929