Penetration of ELF currents and electromagnetic fields into the Earth's equatorial ionosphere

Bengt Eliasson, Dennis K. Papadopoulos

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The penetration of extremely low frequency (ELF) transient electromagnetic fields and associated currents in the Earth's equatorial E-region plasma is studied theoretically and numerically. In the low-frequency regime, the plasma dynamics of the E-region is characterized by helicon waves since the ions are viscously coupled to neutrals while the electrons remain mobile. For typical equatorial E-region parameters, the plasma is magnetically insulated from penetration of very long timescale magnetic fields by a thin diffusive sheath. Wave penetration driven by a vertically incident pulse localized in space and time leads to both vertical penetration and the triggering of ELF helicon/whistler waves that carry currents obliquely to the magnetic field lines. The study presented here may have relevance for ELF wave generation by lightning discharges and seismic activity and can lead to new concepts in ELF/ULF injection in the earth-ionosphere waveguide.
Original languageEnglish
Article numberA10301
JournalJournal of Geophysical Research: Space Physics
Volume114
Issue numberA10
DOIs
Publication statusPublished - 3 Oct 2009

Fingerprint

extremely low frequencies
ionospheres
E region
electromagnetic fields
penetration
Earth-ionosphere waveguide
plasma dynamics
wave generation
lightning
magnetic fields
sheaths
injection
low frequencies
pulses
ions
electrons

Keywords

  • equatorial ionosphere
  • e-region
  • elf waves
  • elf fields
  • elf currents
  • electromagnetic fields

Cite this

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abstract = "The penetration of extremely low frequency (ELF) transient electromagnetic fields and associated currents in the Earth's equatorial E-region plasma is studied theoretically and numerically. In the low-frequency regime, the plasma dynamics of the E-region is characterized by helicon waves since the ions are viscously coupled to neutrals while the electrons remain mobile. For typical equatorial E-region parameters, the plasma is magnetically insulated from penetration of very long timescale magnetic fields by a thin diffusive sheath. Wave penetration driven by a vertically incident pulse localized in space and time leads to both vertical penetration and the triggering of ELF helicon/whistler waves that carry currents obliquely to the magnetic field lines. The study presented here may have relevance for ELF wave generation by lightning discharges and seismic activity and can lead to new concepts in ELF/ULF injection in the earth-ionosphere waveguide.",
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Penetration of ELF currents and electromagnetic fields into the Earth's equatorial ionosphere. / Eliasson, Bengt; Papadopoulos, Dennis K.

In: Journal of Geophysical Research: Space Physics, Vol. 114, No. A10, A10301, 03.10.2009.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Penetration of ELF currents and electromagnetic fields into the Earth's equatorial ionosphere

AU - Eliasson, Bengt

AU - Papadopoulos, Dennis K.

PY - 2009/10/3

Y1 - 2009/10/3

N2 - The penetration of extremely low frequency (ELF) transient electromagnetic fields and associated currents in the Earth's equatorial E-region plasma is studied theoretically and numerically. In the low-frequency regime, the plasma dynamics of the E-region is characterized by helicon waves since the ions are viscously coupled to neutrals while the electrons remain mobile. For typical equatorial E-region parameters, the plasma is magnetically insulated from penetration of very long timescale magnetic fields by a thin diffusive sheath. Wave penetration driven by a vertically incident pulse localized in space and time leads to both vertical penetration and the triggering of ELF helicon/whistler waves that carry currents obliquely to the magnetic field lines. The study presented here may have relevance for ELF wave generation by lightning discharges and seismic activity and can lead to new concepts in ELF/ULF injection in the earth-ionosphere waveguide.

AB - The penetration of extremely low frequency (ELF) transient electromagnetic fields and associated currents in the Earth's equatorial E-region plasma is studied theoretically and numerically. In the low-frequency regime, the plasma dynamics of the E-region is characterized by helicon waves since the ions are viscously coupled to neutrals while the electrons remain mobile. For typical equatorial E-region parameters, the plasma is magnetically insulated from penetration of very long timescale magnetic fields by a thin diffusive sheath. Wave penetration driven by a vertically incident pulse localized in space and time leads to both vertical penetration and the triggering of ELF helicon/whistler waves that carry currents obliquely to the magnetic field lines. The study presented here may have relevance for ELF wave generation by lightning discharges and seismic activity and can lead to new concepts in ELF/ULF injection in the earth-ionosphere waveguide.

KW - equatorial ionosphere

KW - e-region

KW - elf waves

KW - elf fields

KW - elf currents

KW - electromagnetic fields

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