Stratospheric VLF vertical electric mono-and dipole antenna tests in 2014–2015

Miś, Tomasz Aleksander; Modelski, J.

doi:10.23919/ursi.2018.8406693

2018 Baltic URSI Symposium (URSI) 2018

DOI: 10.23919/ursi.2018.8406693

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Stratospheric VLF vertical electric mono-and dipole antenna tests in 2014–2015

Tomasz Aleksander Miś

J. Modelski

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Model Investigations on Electric Discharges over Balloon-Borne Stratospheric VLF Antennas

2022

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Long linear antennas for very low frequency radio transmissions, supported by aerostats, unanchored, and raised to high altitudes, present themselves as slow-moving, highly conductive disturbances in cloud layers, acquiring an electrical charge and being subjected to intense coronae. High electric field strength values around those objects increase the risk of lightning strikes, which could be disastrous to the mechanical structures of the balloon mission (both the antenna and the balloon) and the radio transmitter. This paper aims to investigate the inception of lightning strikes over two essential elements of such missions: a talc-covered latex (balloon material) and the model of the linear antenna, made of different materials. Based on the high-voltage experiments with the recorded electrical discharges, the properties, functions, and possible ameliorations of the talc cover are presented, as well as the basic characteristics of lightning forms around the very long antenna system, with a proposition of design requirements and constraints reflecting the safety of the balloon missions employing a VLF antenna from lightning strikes.

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Model Investigations on Electric Discharges over Balloon-Borne Stratospheric VLF Antennas

2022

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Environmental Sensitivity of Large Stealth Longwave Antenna Systems

Miś

Modelski

2021

Remote Sensing

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This article presents an analysis of measurements collected during a six-month-long experimental deployment of a surface-placed horizontal magnetic loop antenna. The changes in the measured parameters of the loop are investigated in relation to the surrounding environment’s composition, temperature and water content. Basic functions describing these changes are formulated. The results are confronted with outcomes from similar experiments from previous years and different locations, showing good compliance. The developed functions and antenna system can be used for environmental monitoring of soil composition and humidity over large areas and volumes, helpful in, for example, flood awareness.

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Risk Assessment and Experimental Light-Balloon Deployment of a Stratospheric Vertical VLF Transmitter

Miś

Modelski

2023

Sensors

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This paper discusses the risks associated with an aerostat-supported stratospheric (unanchored) balloon mission equipped with a long vertical antenna and a very low frequency radio transmitter. The risks have been grouped into four main types and applicable mitigation methods have been presented to provide a sufficient level of safety and reliability to such a balloon mission. An experimental mission consistent with this analysis, based on the described theoretical VLF propagation approach, has been prepared and launched, and is operating at 14.2 kHz with a vertical antenna of a total length of 400 m and a total payload of max. 4 kg. The maximum altitude reached 29,164 m. The experiment’s signal has been registered in numerous locations in Europe; the results are compared with numerical analysis employing a hypothesis of an apparent transmitting frequency decrease with the rise of the transmitter’s altitude. The numerical analysis explains the behavior of the experimental signal and remains generally consistent with the hypothesis.

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Stratospheric VLF vertical electric mono-and dipole antenna tests in 2014–2015

Cited by 3 publications

References 0 publications

Model Investigations on Electric Discharges over Balloon-Borne Stratospheric VLF Antennas

Model Investigations on Electric Discharges over Balloon-Borne Stratospheric VLF Antennas

Environmental Sensitivity of Large Stealth Longwave Antenna Systems

Risk Assessment and Experimental Light-Balloon Deployment of a Stratospheric Vertical VLF Transmitter

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