Publications by Thomas Chaumont

Cartesian and spherical multipole expansions in anisotropic media

Marcos Rubinstein, Farhad Rachidi-Haeri, Elias Per Joachim Le Boudec, Jose Felix Vega Stavro, Thomas Chaumont

The multipole expansion, a ubiquitous tool in a variety of physical problems, can be formulated in spherical and Cartesian coordinates. By constructing an explicit map linking both formulations in isotropic media, we discover a lack of equivalence between ...

Springer Science and Business Media LLC2025

Underlying Physical Mechanisms in Upward Positive Flashes

Marcos Rubinstein, Thomas Chaumont

This study presents the first observation of a mixed mode (MM) of charge transfer during an upward positive flash, which was initiated from the Säntis Tower in Switzerland. High‐speed camera footage, along with current and electric field measurements, reve ...

American Geophysical Union (AGU)2025

Direct observations of X-rays produced by upward positive lightning

Marcos Rubinstein, Antonio Sunjerga, Farhad Rachidi-Haeri, Thomas Chaumont

X-rays have been observed in natural downward cloud-to-ground lightning for over 20 years and in rocket-triggered lightning for slightly less. In both cases, this energetic radiation has been detected during the stepped and dart leader phases of downward n ...

Nature Publishing Group2024

Application of the Smorgonskiy Method for the Estimation of Upward Lightning Incidence on Tall Towers Using WWLLN Data - Preliminary Results

Marcos Rubinstein, Farhad Rachidi-Haeri, Thomas Chaumont

2024