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Mohammad Azadifar

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Related publications (80)

The Propagation Effects of Lightning Electromagnetic Fields Over Mountainous Terrain in the Earth-Ionosphere Waveguide

Farhad Rachidi-Haeri, Marcos Rubinstein, Mohammad Azadifar, Dongshuai Li

In this paper, a full-wave two-dimensional Finite-Difference-Time-Domain model is developed to evaluate the propagation effects of lightning electromagnetic fields over mountainous terrain in the Earth-ionosphere waveguide. In the model, we investigate the ...

2019

Polarimetric radar characteristics of lightning initiation and propagating channels

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

2019

An Extension of the Guided Wave M-Component Model Taking into Account the Presence of a Tall Strike Object

Farhad Rachidi-Haeri, Marcos Rubinstein, Mohammad Azadifar, Mi Zhou, Qi Li

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

Performance Analysis of the Moving Computational Domain Technique for the Calculation of Sferics

Marcos Rubinstein, Mohammad Azadifar, Wenhao Hou, Qilin Zhang

2019

Pulses in Upward Negative Lightning at the Säntis Tower in Northeastern Switzerland

Farhad Rachidi-Haeri, Marcos Rubinstein, Davide Pavanello, Mohammad Azadifar, Lixia He

Upward lightning happens predominantly from tall objects. The channel-base currents associated with upward negative lightning initiated from towers exhibit pulses that can be classified, based on their waveform features and on the concurrence with other pr ...

2019

Locating Lightning Using Electromagnetic Time Reversal: Application of the Minimum Entropy Criterion

Marcos Rubinstein, Mohammad Azadifar, Hamidreza Karami, Zhaoyang Wang, Amirhossein Mostajabi

2019

Two Possible Scenarios for the Formation of Category 1 Bipolar Lightning Flashes

Marcos Rubinstein, Davide Pavanello, Mohammad Azadifar, Qi Li

We present and discuss the current and electric field waveforms associated with two upward bipolar lightning flashes that occurred at the Säntis Tower. According to the traditional classification of bipolar flashes, both observed flashes could be classifie ...

2019

An Analysis of Current and Electric Field Pulses Associated With Upward Negative Lightning Flashes Initiated from the Säntis Tower

Marcos Rubinstein, Davide Pavanello, Mohammad Azadifar, Lixia He

We present a study on the characteristics of current and electric field pulses associated with upward lightning flashes initiated from the instrumented Säntis Tower in Switzerland. The electric field was measured 15 km from the tower. Upward flashes always ...

2018

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

LMA Observation of Upward Flashes at Santis Tower: Preliminary Results

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

Lightning striking tall towers is mainly of the upward lightning type, which is characterized by the absence of a first return stroke and the presence of an initial continuous current (ICC) with or without superimposed pulses. The Santis Tower is 124 m tal ...

IEEE2018

Does the magnetic field from the leader current influence the fine geometrical structure of the lightning channel?

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

2018

Modeling of Different Charge Transfer Modes in Upward Flashes Constrained by Simultaneously Measured Currents and Fields

Farhad Rachidi-Haeri, Marcos Rubinstein, Davide Pavanello, Mario Paolone, Mohammad Azadifar, Lixia He, Qi Li

The purpose of the paper is to investigate charge transfer modes in upward lightning flashes by means of numerical simulation constrained by concurrent observations of electromagnetic fields and currents. In particular, we focus on different types of pulse ...

2018

On the Impact of Meteorological Conditions on the Initiation of Upward Lightning Flashes from Tall Structures

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

2018

Characteristics of Upward Lightning Flashes

Mohammad Azadifar

In addition to the general aims of lightning research such as lightning physics and meteorology, the study of upward lightning is of particular importance in protection of tall objects such as wind turbines and telecommunication towers. It also helps us in ...

EPFL2018

An Analysis of Lightning Activity in the Säntis Region through the Big Hiatus in Global Warming

Farhad Rachidi-Haeri, Marcos Rubinstein, Aleksandr Smorgonskii, Mohammad Azadifar, Amirhossein Mostajabi

The response of local lightning to local surface temperature is examined near the Säntis mountain (2502 m ASL) in the eastern Swiss Alps during the first of the two hiatuses in global warming covering the time periods 1940-1972 and 1998-2014. The mountain ...

2018

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Mohammad Azadifar

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The Propagation Effects of Lightning Electromagnetic Fields Over Mountainous Terrain in the Earth-Ionosphere Waveguide

Polarimetric radar characteristics of lightning initiation and propagating channels

An Extension of the Guided Wave M-Component Model Taking into Account the Presence of a Tall Strike Object

LMA Observation of Upward Bipolar Lightning Flash at the Säntis Tower

Performance Analysis of the Moving Computational Domain Technique for the Calculation of Sferics

Pulses in Upward Negative Lightning at the Säntis Tower in Northeastern Switzerland

Locating Lightning Using Electromagnetic Time Reversal: Application of the Minimum Entropy Criterion

Two Possible Scenarios for the Formation of Category 1 Bipolar Lightning Flashes

An Analysis of Current and Electric Field Pulses Associated With Upward Negative Lightning Flashes Initiated from the Säntis Tower

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

LMA Observation of Upward Flashes at Santis Tower: Preliminary Results

Does the magnetic field from the leader current influence the fine geometrical structure of the lightning channel?

Modeling of Different Charge Transfer Modes in Upward Flashes Constrained by Simultaneously Measured Currents and Fields

On the Impact of Meteorological Conditions on the Initiation of Upward Lightning Flashes from Tall Structures

Characteristics of Upward Lightning Flashes

An Analysis of Lightning Activity in the Säntis Region through the Big Hiatus in Global Warming

On the Similarity of Electric Field Signatures of Upward and Downward Negative Leaders

An Update on the Characteristics of Positive Flashes Measured at the Säntis Tower

On the Classification of Self-Triggered versus Other-Triggered Lightning Flashes

A Large Bipolar Event Recorded at the Säntis Tower