Systematic deviations in source direction estimates of Q-bursts recorded at Nagycenk, Hungary

József Bór, Brigitta Ludván, Novák Attila, Péter Steinbach

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Q-bursts are globally detectable extremely low frequency (ELF, 3-3000Hz) band wave packets produced by intense lightning discharges. Q-bursts recorded in the Széchenyi István Geophysical Observatory (NCK, 16.7°E, 47.6°N), Hungary, on 1 and 2 August 2012 have been analyzed to find azimuths of their sources. The location of parent lightning strokes of 320 and 205 Q-bursts on the 2days, respectively, have been identified in the records of the World Wide Lightning Location Network (WWLLN) using the detection times at NCK. ELF data-based source azimuths were found to differ systematically from source azimuths obtained from WWLLN lightning locations. The difference between the corresponding azimuth values depends on the azimuth of the source. This variation of the source azimuth error mirrors the symmetry of the conductance of the Earth's crust inferred from magnetotelluric measurements around NCK. After correction for the azimuthal dependence, the variation of the residual error shows a diurnal pattern with positive azimuth deviations occurring near midnight, local time. Füllekrug and Sukhorukov (1999) suggested that the anisotropic conductivity in the Earth's crust below the observatory and the different daytime and nighttime conductivities in the lower ionosphere, respectively, may cause the identified error terms. Our results emphasize the substantial effect of anisotropic conductivity in the Earth's crust around the recording station on the accuracy of ELF direction finding. The need for theoretical approach and more measurements is pointed in understanding the underlying mechanisms quantitatively and in investigating whether ELF observations can be used in geophysical prospecting.

Original languageEnglish
JournalJournal of Geophysical Research
DOIs
Publication statusAccepted/In press - 2016

Fingerprint

lightning
Hungary
Lightning
azimuth
bursts
deviation
Earth crust
estimates
Earth (planet)
Observatories
conductivity
Geophysical prospecting
Magnetotellurics
Wave packets
Ionosphere
geophysical observatories
observatory
diurnal variation
stroke
direction finding

Keywords

  • Anisotropic conductivity
  • Earth-ionosphere waveguide
  • Extremely low frequency ELF
  • Geophysical prospecting
  • Lightning location
  • Q-burst

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Systematic deviations in source direction estimates of Q-bursts recorded at Nagycenk, Hungary. / Bór, József; Ludván, Brigitta; Attila, Novák; Steinbach, Péter.

In: Journal of Geophysical Research, 2016.

Research output: Contribution to journalArticle

@article{d715a0dcd4b2465b89519c866f3b12af,
title = "Systematic deviations in source direction estimates of Q-bursts recorded at Nagycenk, Hungary",
abstract = "Q-bursts are globally detectable extremely low frequency (ELF, 3-3000Hz) band wave packets produced by intense lightning discharges. Q-bursts recorded in the Sz{\'e}chenyi Istv{\'a}n Geophysical Observatory (NCK, 16.7°E, 47.6°N), Hungary, on 1 and 2 August 2012 have been analyzed to find azimuths of their sources. The location of parent lightning strokes of 320 and 205 Q-bursts on the 2days, respectively, have been identified in the records of the World Wide Lightning Location Network (WWLLN) using the detection times at NCK. ELF data-based source azimuths were found to differ systematically from source azimuths obtained from WWLLN lightning locations. The difference between the corresponding azimuth values depends on the azimuth of the source. This variation of the source azimuth error mirrors the symmetry of the conductance of the Earth's crust inferred from magnetotelluric measurements around NCK. After correction for the azimuthal dependence, the variation of the residual error shows a diurnal pattern with positive azimuth deviations occurring near midnight, local time. F{\"u}llekrug and Sukhorukov (1999) suggested that the anisotropic conductivity in the Earth's crust below the observatory and the different daytime and nighttime conductivities in the lower ionosphere, respectively, may cause the identified error terms. Our results emphasize the substantial effect of anisotropic conductivity in the Earth's crust around the recording station on the accuracy of ELF direction finding. The need for theoretical approach and more measurements is pointed in understanding the underlying mechanisms quantitatively and in investigating whether ELF observations can be used in geophysical prospecting.",
keywords = "Anisotropic conductivity, Earth-ionosphere waveguide, Extremely low frequency ELF, Geophysical prospecting, Lightning location, Q-burst",
author = "J{\'o}zsef B{\'o}r and Brigitta Ludv{\'a}n and Nov{\'a}k Attila and P{\'e}ter Steinbach",
year = "2016",
doi = "10.1002/2015JD024712",
language = "English",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",

}

TY - JOUR

T1 - Systematic deviations in source direction estimates of Q-bursts recorded at Nagycenk, Hungary

AU - Bór, József

AU - Ludván, Brigitta

AU - Attila, Novák

AU - Steinbach, Péter

PY - 2016

Y1 - 2016

N2 - Q-bursts are globally detectable extremely low frequency (ELF, 3-3000Hz) band wave packets produced by intense lightning discharges. Q-bursts recorded in the Széchenyi István Geophysical Observatory (NCK, 16.7°E, 47.6°N), Hungary, on 1 and 2 August 2012 have been analyzed to find azimuths of their sources. The location of parent lightning strokes of 320 and 205 Q-bursts on the 2days, respectively, have been identified in the records of the World Wide Lightning Location Network (WWLLN) using the detection times at NCK. ELF data-based source azimuths were found to differ systematically from source azimuths obtained from WWLLN lightning locations. The difference between the corresponding azimuth values depends on the azimuth of the source. This variation of the source azimuth error mirrors the symmetry of the conductance of the Earth's crust inferred from magnetotelluric measurements around NCK. After correction for the azimuthal dependence, the variation of the residual error shows a diurnal pattern with positive azimuth deviations occurring near midnight, local time. Füllekrug and Sukhorukov (1999) suggested that the anisotropic conductivity in the Earth's crust below the observatory and the different daytime and nighttime conductivities in the lower ionosphere, respectively, may cause the identified error terms. Our results emphasize the substantial effect of anisotropic conductivity in the Earth's crust around the recording station on the accuracy of ELF direction finding. The need for theoretical approach and more measurements is pointed in understanding the underlying mechanisms quantitatively and in investigating whether ELF observations can be used in geophysical prospecting.

AB - Q-bursts are globally detectable extremely low frequency (ELF, 3-3000Hz) band wave packets produced by intense lightning discharges. Q-bursts recorded in the Széchenyi István Geophysical Observatory (NCK, 16.7°E, 47.6°N), Hungary, on 1 and 2 August 2012 have been analyzed to find azimuths of their sources. The location of parent lightning strokes of 320 and 205 Q-bursts on the 2days, respectively, have been identified in the records of the World Wide Lightning Location Network (WWLLN) using the detection times at NCK. ELF data-based source azimuths were found to differ systematically from source azimuths obtained from WWLLN lightning locations. The difference between the corresponding azimuth values depends on the azimuth of the source. This variation of the source azimuth error mirrors the symmetry of the conductance of the Earth's crust inferred from magnetotelluric measurements around NCK. After correction for the azimuthal dependence, the variation of the residual error shows a diurnal pattern with positive azimuth deviations occurring near midnight, local time. Füllekrug and Sukhorukov (1999) suggested that the anisotropic conductivity in the Earth's crust below the observatory and the different daytime and nighttime conductivities in the lower ionosphere, respectively, may cause the identified error terms. Our results emphasize the substantial effect of anisotropic conductivity in the Earth's crust around the recording station on the accuracy of ELF direction finding. The need for theoretical approach and more measurements is pointed in understanding the underlying mechanisms quantitatively and in investigating whether ELF observations can be used in geophysical prospecting.

KW - Anisotropic conductivity

KW - Earth-ionosphere waveguide

KW - Extremely low frequency ELF

KW - Geophysical prospecting

KW - Lightning location

KW - Q-burst

UR - http://www.scopus.com/inward/record.url?scp=84971333771&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84971333771&partnerID=8YFLogxK

U2 - 10.1002/2015JD024712

DO - 10.1002/2015JD024712

M3 - Article

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

ER -