The number of electrons that are stripped off from the target depends on their accumulated energy and on the target's local positive charge attracting them back to the target [16]. Thus, on one side the electron depletion process can be the source of a direct electromagnetic pulse (EMP) wave due to the accelerated movement, while on the other side, their take-off locally charges the surface, producing the case of an almost complete ionization of a Coulomb explosion [17; 18; 19], and consequently, a further proton/ion acceleration process [20; 21]. Part of the laser pulse energy is converted into broadband electromagnetic pulses (EMPs) including radio and microwave ranges. Emission in the frequency range lower than 30-100 GHz is produced on a timescale longer than 30-100 ps and is related to the relaxation of the charge accumulated on the target during the laser pulse interaction. Due to their high intensities, such fields represent a significant danger for the electronic equipment in the vicinity of the interaction point and also represent a serious issue in the time-of-flight detection of fast particles. Understanding and potentially controlling the sources of these electromagnetic fields and their distribution is a crucial point in ensuring the safe operation of the equipment in high-power laser facilities, but there is also a possible use of these EMP fields in other applications. A potential main source of EMPs considered by some studies [4; 16; 22] is target positive charging generated by electron extraction from the target. Target charging produces strong neutralization currents from the ground through the conductive walls of the interaction chamber and the metallic holder of the target. Nevertheless, other laser-matter interaction-related mechanisms could potentially generate an ultra-intense electromagnetic field and there are some studies discussing and comparing some possible sources specific to laser acceleration [4] and confinement fusion experiments. Whenever one is interested in generating accelerated electrons [23] or protons [20; 24], it is essential to characterize the number and energy of removed particles, while at the same time, one must consider and mitigate the effects of EMPs on the electronic devices in the experimental setup. There are different direct and indirect techniques that can be applied to evaluate the emitted electron energy and number [23; 25], but they are not trivial and require elaborate setups. Some of these techniques either capture the whole beam to perform a measurement (e.g., Faraday cup) or are rather limited in resolution due to EMP perturbations (e.g., Integrating Current Transformer--ICT). Most of the time, the characterization of the removed electrons is not a purpose per se, but just a reference for accelerated particles used in more complex experiments or processes. Hence, achieving a real-time characterization without significantly affecting the accelerated particle characteristics represents a real challenge. As an EMP is inevitably produced in particle acceleration techniques, it can be mitigated [4; 26; 27] in a best-case scenario. Furthermore, electron characterization is a challenging but indispensable process for accelerated particle applications [28]. The central idea behind this work is to establish a correlation between EMPs and accelerated electron energy. Starting from the EMP field propagation in the vacuum chamber, we should notice that EMP fields last for a considerably longer time than the laser pulse duration. Thus, due to the meter size dimensions of the experimental chamber, the EMP wave will have multiple reflections between the walls and other objects inside the chamber and a modal structure of the field will be determined in this way in hundreds of ns. Considering the complex temporal structure of the EMP signal as a weighted sum of an orthogonal set of eigenmodes, amplitude variations of the signal could be approached through the amplitude envelope characterization [29].