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Antonio Sunjerga

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Publications associées (45)

LMA observations of upward lightning flashes at the Santis Tower initiated by nearby lightning activity

Farhad Rachidi-Haeri, Marcos Rubinstein, Jacopo Grazioli, Mohammad Azadifar, Nikola Besic, Amirhossein Mostajabi, Antonio Sunjerga, Urs Martin Germann

We present in this paper lightning current measurements, LMA (Lightning Mapping Array) data and fast antenna electric fields associated with upward flashes observed at the Santis Tower during summer of 2017. The LMA network consists of six stations that we ...

Elsevier2020

Polarimetric radar characteristics of lightning initiation and propagating channels

Marcos Rubinstein, Jacopo Grazioli, Mohammad Azadifar, Nikola Besic, Amirhossein Mostajabi, Antonio Sunjerga

2019

Importance of Taking Into Account the Soil Stratification in Reproducing the Late-Time Features of Distant Fields Radiated by Lightning

Farhad Rachidi-Haeri, Marcos Rubinstein, Mi Zhou, Antonio Sunjerga, Qi Li

In this paper, we present an analysis of the propagation effect along a lossy ground on the characteristics of lightning-generated electric fields, using simultaneous observations of lightning currents and radiated fields measured at nine different distanc ...

2019

LMA Observation of Upward Bipolar Lightning Flash at the Säntis Tower

Marcos Rubinstein, Jacopo Grazioli, Mohammad Azadifar, Nikola Besic, Amirhossein Mostajabi, Antonio Sunjerga

2019

On the Influence of an Elevated Terrain on the Grounding Resistance of a Vertical Rod

Farhad Rachidi-Haeri, Marcos Rubinstein, Antonio Sunjerga

In this paper, we analyze the grounding resistance of a vertical grounding rod located in an elevated terrain. Tall structures such as wind turbines and mobile phone base stations are often installed in remote and hilly locations to gain more power or to f ...

IEEE2019

Analysis of the lightning production of convective cells

Farhad Rachidi-Haeri, Marcos Rubinstein, Jacopo Grazioli, Mohammad Azadifar, Nikola Besic, Amirhossein Mostajabi, Antonio Sunjerga, Urs Martin Germann

This paper presents an analysis of the lightningproduction of convective cells. The cells were detected by the MeteoSwiss Thunderstorms Radar Tracking (TRT) algorithm in the course of a lightning measurement campaign thattook place in the summer of 2017 in ...

2019

Meteorological Aspects of Self-Initiated Upward Lightning at the Santis Tower (Switzerland)

Farhad Rachidi-Haeri, Marcos Rubinstein, Jacopo Grazioli, Mohammad Azadifar, Nikola Besic, Amirhossein Mostajabi, Antonio Sunjerga, Urs Martin Germann

Interest in exploring the meteorological conditions favoring upward lightning from tall man-made structures has grown in recent years, largely due to the worldwide expansion of wind energy. To this end, instrumented towers existing around the world are the ...

2019

Some Optimization Techniques of Lightning Field Calculations

Marcos Rubinstein, Antonio Sunjerga

2019

Tower and Path-Dependent Voltage Effects on the Measurement of Grounding Impedance for Lightning Studies

Marcos Rubinstein, Keyhan Sheshyekani, Hamidreza Karami, Antonio Sunjerga

We present an analysis aimed at evaluating the effect of the presence of the tower on the measurement of the grounding impedance. The Numerical Electromagnetics Code NEC-4 is used for the full-wave modeling of the structure including the tower and its foot ...

2019

Multiple-Station Measurements of a Return-Stroke Electric Field From Rocket-Triggered Lightning at Distances of 68-126 km

Mi Zhou, Antonio Sunjerga, Qi Li

Far-field measurements of lightning-produced electromagnetic fields are of high importance for lightning location systems. Data from recorded lightning strokes can be, for example, used to assess the risk of lightning-induced damage in some geographical ar ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2019

Reduction of a Cone-Shaped Terrain Grounding Resistance by Remote Grounding

Farhad Rachidi-Haeri, Marcos Rubinstein, Antonio Sunjerga

Tall structures such as wind turbines and mobile phone base stations are often installed in remote and hilly locations to gain more power or to have line of sight to end users. Those locations are usually very rocky and characterized by a low-conductivity ...

IEEE2019

Polarimetric radar characteristics of lightning initiation and propagating channels

Farhad Rachidi-Haeri, Marcos Rubinstein, Jacopo Grazioli, Mohammad Azadifar, Nikola Besic, Amirhossein Mostajabi, Antonio Sunjerga, Urs Martin Germann

In this paper we present an analysis of a large dataset of lightning and polarimetric weather radar data collected in the course of a lightning measurement campaign that took place in the summer of 2017 in the area surrounding Säntis, in the northeastern p ...

2019

Isolated vs. Interconnected Wind Turbine Grounding Systems: Effect on the Harmonic Grounding Impedance, Ground Potential Rise and Step Voltage

Farhad Rachidi-Haeri, Marcos Rubinstein, Antonio Sunjerga, Qi Li

Wind turbines are very vulnerable to lightning strikes due to their height, sharp edges and remote locations often with high soil resistivity. In this paper we present numerical simulations of the impedance of a typical wind turbine grounding geometry. We ...

Elsevier2019

Calculation of the Grounding Resistance of Structures Located on Elevated Terrain

Farhad Rachidi-Haeri, Marcos Rubinstein, Antonio Sunjerga

We present an analysis of the response of a grounding electrode located on the top of a mountain. Specifically, we derive an analytical solution for the low-frequency response of a hemispheric grounding electrode buried on the top of a cone-shaped mountain ...

2019

On the Influence of an Elevated Terrain on the Grounding Resistance of a Vertical Rod

Marcos Rubinstein, Antonio Sunjerga

2019

Meteorological conditions during self-initiated upward lightning at the Säntis tower (Switzerland)

Farhad Rachidi-Haeri, Marcos Rubinstein, Jacopo Grazioli, Mohammad Azadifar, Nikola Besic, Amirhossein Mostajabi, Antonio Sunjerga

Meteorological conditions favoring the initiation of upward lightning from tall structures have been only poorly investigated so far. In addition to the scientific interest in this subject, it has practical applications to risk assessment for lightning occ ...

2019

An experimental field study of the grounding system response of tall wind turbines to impulse surges

Marcos Rubinstein, Nicolas Mora Parra, Antonio Sunjerga

In this work, an experimental investigation of the grounding system behavior of tall wind turbines in both time and frequency domains is presented. Two scenarios were considered: in the first one, measurements were carried out on the grounding system embed ...

Elsevier2018

Lorentz Force from a Current-Carrying Wire on a Charge in Motion under the Assumption of Neutrality in the Symmetrical Frame of Reference

Marcos Rubinstein, Antonio Sunjerga

It is commonly assumed that a wire conducting an electric current is neutral in the laboratory frame of reference (the rest frame of the lattice of positive ions). Some authors consider that the wire is neutral only in a symmetrical frame of reference, in ...

2018

Transient Impedance of Interconnected Wind Turbine Grounding Systems

Farhad Rachidi-Haeri, Marcos Rubinstein, Antonio Sunjerga, Qi Li

Wind turbines are very vulnerable to lightning because of their height, sharp edges and remote locations often with low soil conductivity. In this paper we present numerical simulations of the impedance of a typical wind turbine grounding geometry. We anal ...

IEEE2018

LMA Campaign for the Observation of Upward Lightning at the Säntis Tower During Summer 2017: Preliminary Results

Farhad Rachidi-Haeri, Marcos Rubinstein, Mohammad Azadifar, Amirhossein Mostajabi, Antonio Sunjerga

2018

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