Atmospheric electric fields during thunderstorm conditions measured by LOFAR

Thi Ngoc Gia Trinh

Atmospheric electric fields during thunderstorm conditions measured by LOFAR

Vertaalde titel van de bijdrage: Atmosferische elektrische velden tydens onweersomstanding heden gemeten door LOFAR

Thi Ngoc Gia Trinh

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Sterke atmosferische elektrische velden hebben een aanzienlijk effect op de radio-emissie van cascades van secondaire deeltjes in de atmosfeer (deeltjeslawines) die door kosmische stralen worden geinitieerd, zelfs als deze velden niet sterk genoeg zijn om de bliksemactiviteit te veroorzaken. Metingen van de radio-emissie van de deeltjeslawines bij LOFAR laten zien dat de intensiteit en polarisatie van de radio emissie van de lawine gemeten onder "onweer" omstandigheden zeer verschillend zijn van de waarden tijdens mooi weer. Om deze reden kunnen de "onweers" gebeurtenissen worden gebruikt om de atmosferische elektrische velden te bepalen. Deze techniek is uitgelegd en ontwikkeld in dit proefschrift. Het is aangetoond dat, om deze gebeurtenissen te reconstrueren, de atmosferische elektrische velden in wolken over het algemeen samengesteld is uit drie lagen. De elektrische velden geëxtraheerd uit deze gebeurtenissen hebben grote horizontale componenten van de elektrische velden in de middelste en bovenste lagen. De hoogte van de onderste laag is afhankelijk van het seizoen.

Vertaalde titel van de bijdrage	Atmosferische elektrische velden tydens onweersomstanding heden gemeten door LOFAR
Originele taal-2	English
Kwalificatie	Doctor of Philosophy
Begeleider(s)/adviseur	Scholten, Olaf, Supervisor Berg ,van den, Ad M, Supervisor Ebert, U., Supervisor, Externe Persoon Dwyer, J., Beoordelingscommissie, Externe Persoon Huege, T., Beoordelingscommissie, Externe Persoon Kalantar-Nayestanaki, Nasser, Beoordelingscommissie
Datum van toekenning	9-jul.-2018
Plaats van publicatie	[Groningen]
Uitgever	University of Groningen
Gedrukte ISBN's	978-94-034-0815-6
Elektronische ISBN's	978-94-034-0816-3
Status	Published - 2018

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Title and contentsFinal publisher's version, 343 KB
Chapter 1Final publisher's version, 22,9 MB
Chapter 2Final publisher's version, 2,52 MB
Chapter 3Final publisher's version, 2,27 MB
Chapter 4Final publisher's version, 1,46 MB
Chapter 5Final publisher's version, 5,52 MB
Chapter 6Final publisher's version, 69,1 KB
ReferencesFinal publisher's version, 112 KB
Complete thesisFinal publisher's version, 33,9 MB
PropositionsFinal publisher's version, 82,9 KB

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title = "Atmospheric electric fields during thunderstorm conditions measured by LOFAR",

abstract = "Strong atmospheric electric fields, even if they are not strong enough to initiate lightning activity, significantly affect radio emission from extensive air showers. Measurements of radio emission from extensive air showers at LOFAR show that intensity and polarization signatures of the showers measured under “thunderstorm” conditions are very different from those measured during fair weather. For this reason, the “thunderstorm” events can be used to determine atmospheric electric fields. The physics understanding of this effect as well as the technique to extract the atmospheric electric fields are presented in this thesis. It is shown that in order to reconstruct these events it is generally sufficient to model the atmospheric electric fields in clouds as composed of three layers. The electric fields extracted from these events have large horizontal components of the electric fields in the middle and the top layers. The height of the bottom layer depends on the season.",

author = "Trinh, {Thi Ngoc Gia}",

year = "2018",

language = "English",

isbn = "978-94-034-0815-6",

publisher = "University of Groningen",

}

TY - BOOK

T1 - Atmospheric electric fields during thunderstorm conditions measured by LOFAR

AU - Trinh, Thi Ngoc Gia

PY - 2018

Y1 - 2018

N2 - Strong atmospheric electric fields, even if they are not strong enough to initiate lightning activity, significantly affect radio emission from extensive air showers. Measurements of radio emission from extensive air showers at LOFAR show that intensity and polarization signatures of the showers measured under “thunderstorm” conditions are very different from those measured during fair weather. For this reason, the “thunderstorm” events can be used to determine atmospheric electric fields. The physics understanding of this effect as well as the technique to extract the atmospheric electric fields are presented in this thesis. It is shown that in order to reconstruct these events it is generally sufficient to model the atmospheric electric fields in clouds as composed of three layers. The electric fields extracted from these events have large horizontal components of the electric fields in the middle and the top layers. The height of the bottom layer depends on the season.

AB - Strong atmospheric electric fields, even if they are not strong enough to initiate lightning activity, significantly affect radio emission from extensive air showers. Measurements of radio emission from extensive air showers at LOFAR show that intensity and polarization signatures of the showers measured under “thunderstorm” conditions are very different from those measured during fair weather. For this reason, the “thunderstorm” events can be used to determine atmospheric electric fields. The physics understanding of this effect as well as the technique to extract the atmospheric electric fields are presented in this thesis. It is shown that in order to reconstruct these events it is generally sufficient to model the atmospheric electric fields in clouds as composed of three layers. The electric fields extracted from these events have large horizontal components of the electric fields in the middle and the top layers. The height of the bottom layer depends on the season.

M3 - Thesis fully internal (DIV)

SN - 978-94-034-0815-6

PB - University of Groningen

CY - [Groningen]

ER -

Atmospheric electric fields during thunderstorm conditions measured by LOFAR

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