Ultra-slow tails of sprite-associated lightning flashes

Martin Füllekrug, A C Fraser-Smith, S C Reising

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We describe the terrestrial excitation of horizontal magnetic field variations in the Pc1 frequency range (0.2-5.0 Hz) by tropospheric, sprite-associated lightning flashes, measured similar to 1900 km west from the source. These variations, which we call ultra-slow tails, exhibit amplitudes on the order of tens of pT, they have a duration of similar to 3 seconds, and they occur immediately following the initial pulse of the sprite-associated lightning flash. The ultra-slow tails exhibit two peaks in the frequency domain at 0.67 Hz and 1.67 Hz. The mean polarization ellipses at these two frequencies are oriented similar to 45 degrees clockwise from geographic north and exhibit right-hand and left-hand polarization respectively with a weak ellipticity of similar to 0.1. The horizontal magnetic intensity of the Initial pulse is related to the horizontal magnetic intensity of the ultra-slow tail, in agreement with the interpretation of ultra-slow tails as ionospheric Alfven resonances.
Original languageEnglish
Pages (from-to)3497-3500
Number of pages4
JournalGeophysical Research Letters
Volume25
Issue number18
Publication statusPublished - 1998

Fingerprint

sprite
magnetic intensity
lightning
flash
polarization
ellipse
ellipses
ellipticity
pulses
ionospherics
frequency ranges
magnetic field
magnetic fields
excitation

Keywords

  • Pulsations
  • Ionospheric Alfven Resonator
  • Discharges
  • Elves

Cite this

Füllekrug, M., Fraser-Smith, A. C., & Reising, S. C. (1998). Ultra-slow tails of sprite-associated lightning flashes. Geophysical Research Letters, 25(18), 3497-3500.

Ultra-slow tails of sprite-associated lightning flashes. / Füllekrug, Martin; Fraser-Smith, A C; Reising, S C.

In: Geophysical Research Letters, Vol. 25, No. 18, 1998, p. 3497-3500.

Research output: Contribution to journalArticle

Füllekrug, M, Fraser-Smith, AC & Reising, SC 1998, 'Ultra-slow tails of sprite-associated lightning flashes', Geophysical Research Letters, vol. 25, no. 18, pp. 3497-3500.
Füllekrug, Martin ; Fraser-Smith, A C ; Reising, S C. / Ultra-slow tails of sprite-associated lightning flashes. In: Geophysical Research Letters. 1998 ; Vol. 25, No. 18. pp. 3497-3500.
@article{e7d7995c0cc14259a78f797723cdd3ac,
title = "Ultra-slow tails of sprite-associated lightning flashes",
abstract = "We describe the terrestrial excitation of horizontal magnetic field variations in the Pc1 frequency range (0.2-5.0 Hz) by tropospheric, sprite-associated lightning flashes, measured similar to 1900 km west from the source. These variations, which we call ultra-slow tails, exhibit amplitudes on the order of tens of pT, they have a duration of similar to 3 seconds, and they occur immediately following the initial pulse of the sprite-associated lightning flash. The ultra-slow tails exhibit two peaks in the frequency domain at 0.67 Hz and 1.67 Hz. The mean polarization ellipses at these two frequencies are oriented similar to 45 degrees clockwise from geographic north and exhibit right-hand and left-hand polarization respectively with a weak ellipticity of similar to 0.1. The horizontal magnetic intensity of the Initial pulse is related to the horizontal magnetic intensity of the ultra-slow tail, in agreement with the interpretation of ultra-slow tails as ionospheric Alfven resonances.",
keywords = "Pulsations, Ionospheric Alfven Resonator, Discharges, Elves",
author = "Martin F{\"u}llekrug and Fraser-Smith, {A C} and Reising, {S C}",
year = "1998",
language = "English",
volume = "25",
pages = "3497--3500",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "Wiley-Blackwell",
number = "18",

}

TY - JOUR

T1 - Ultra-slow tails of sprite-associated lightning flashes

AU - Füllekrug, Martin

AU - Fraser-Smith, A C

AU - Reising, S C

PY - 1998

Y1 - 1998

N2 - We describe the terrestrial excitation of horizontal magnetic field variations in the Pc1 frequency range (0.2-5.0 Hz) by tropospheric, sprite-associated lightning flashes, measured similar to 1900 km west from the source. These variations, which we call ultra-slow tails, exhibit amplitudes on the order of tens of pT, they have a duration of similar to 3 seconds, and they occur immediately following the initial pulse of the sprite-associated lightning flash. The ultra-slow tails exhibit two peaks in the frequency domain at 0.67 Hz and 1.67 Hz. The mean polarization ellipses at these two frequencies are oriented similar to 45 degrees clockwise from geographic north and exhibit right-hand and left-hand polarization respectively with a weak ellipticity of similar to 0.1. The horizontal magnetic intensity of the Initial pulse is related to the horizontal magnetic intensity of the ultra-slow tail, in agreement with the interpretation of ultra-slow tails as ionospheric Alfven resonances.

AB - We describe the terrestrial excitation of horizontal magnetic field variations in the Pc1 frequency range (0.2-5.0 Hz) by tropospheric, sprite-associated lightning flashes, measured similar to 1900 km west from the source. These variations, which we call ultra-slow tails, exhibit amplitudes on the order of tens of pT, they have a duration of similar to 3 seconds, and they occur immediately following the initial pulse of the sprite-associated lightning flash. The ultra-slow tails exhibit two peaks in the frequency domain at 0.67 Hz and 1.67 Hz. The mean polarization ellipses at these two frequencies are oriented similar to 45 degrees clockwise from geographic north and exhibit right-hand and left-hand polarization respectively with a weak ellipticity of similar to 0.1. The horizontal magnetic intensity of the Initial pulse is related to the horizontal magnetic intensity of the ultra-slow tail, in agreement with the interpretation of ultra-slow tails as ionospheric Alfven resonances.

KW - Pulsations

KW - Ionospheric Alfven Resonator

KW - Discharges

KW - Elves

M3 - Article

VL - 25

SP - 3497

EP - 3500

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 18

ER -