Two-dimensional Vlasov simulations of fast stochastic electron heating

Research output: Contribution to journalArticle

Abstract

Ionospheric heating experiments using high frequency ordinary (O) mode electromagnetic waves have shown the induced formation of magnetic field-aligned density striations in the ionospheric F-region. These striations are observed in association with lower-hybrid (LH) and upper-hybrid (UH) turbulence and significant electron heating, further enforcing the striations. High-energy electrons can result in the ionisation of neutrals and the formation of descending artificial ionospheric layers (DAILs). In the current context, we present the results of a two-dimensional (2D) numerical simulation conducted using a Vlasov-Maxwell code to study the mode-conversion of an O mode pump wave to trapped UH waves in a small-scale density striation. Subsequent multi-wave parametric decay is observed leading to UH and LH turbulence and the excitation of large amplitude electron Bernstein (EB) waves. Large-amplitude EB waves result in significant electron heating when the wave amplitude exceeds a threshold value for stochastic motion of the electrons. For typical experimental parameters, the simulated electron temperature is observed to rise from 1500 K to more than 5000 K in a fraction of a millisecond, much faster than the usual Ohmic heating due to collisions which occurs on second-scale. The stochastic electron heating could potentially be one of the mechanisms involved in the formation of DAILs.
LanguageEnglish
Pages10638-10650
Number of pages13
JournalJournal of Geophysical Research: Space Physics
Volume122
Issue number10
Early online date16 Oct 2017
DOIs
Publication statusE-pub ahead of print - 16 Oct 2017

Fingerprint

striation
heating
ionospherics
electrons
simulation
ionospheric heating
turbulence
F region
high energy electrons
electromagnetic radiation
electron energy
pumps
ionization
collisions
thresholds
decay
magnetic fields
excitation

Keywords

  • Vlasov-Maxwell simulations
  • plasma-wave coupling
  • parametric 8 multi-wave excitation
  • field aligned striation
  • stochastic electron heating
  • DAILS
  • decending artificial iono- 14 spheric layers

Cite this

@article{b93dab97d0a549098e2cc1135b134cb7,
title = "Two-dimensional Vlasov simulations of fast stochastic electron heating",
abstract = "Ionospheric heating experiments using high frequency ordinary (O) mode electromagnetic waves have shown the induced formation of magnetic field-aligned density striations in the ionospheric F-region. These striations are observed in association with lower-hybrid (LH) and upper-hybrid (UH) turbulence and significant electron heating, further enforcing the striations. High-energy electrons can result in the ionisation of neutrals and the formation of descending artificial ionospheric layers (DAILs). In the current context, we present the results of a two-dimensional (2D) numerical simulation conducted using a Vlasov-Maxwell code to study the mode-conversion of an O mode pump wave to trapped UH waves in a small-scale density striation. Subsequent multi-wave parametric decay is observed leading to UH and LH turbulence and the excitation of large amplitude electron Bernstein (EB) waves. Large-amplitude EB waves result in significant electron heating when the wave amplitude exceeds a threshold value for stochastic motion of the electrons. For typical experimental parameters, the simulated electron temperature is observed to rise from 1500 K to more than 5000 K in a fraction of a millisecond, much faster than the usual Ohmic heating due to collisions which occurs on second-scale. The stochastic electron heating could potentially be one of the mechanisms involved in the formation of DAILs.",
keywords = "Vlasov-Maxwell simulations, plasma-wave coupling, parametric 8 multi-wave excitation, field aligned striation, stochastic electron heating, DAILS, decending artificial iono- 14 spheric layers",
author = "Speirs, {David Carruthers} and Bengt Eliasson and Daldorff, {Lars K. S.}",
year = "2017",
month = "10",
day = "16",
doi = "10.1002/2017JA024665",
language = "English",
volume = "122",
pages = "10638--10650",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
number = "10",

}

Two-dimensional Vlasov simulations of fast stochastic electron heating. / Speirs, David Carruthers; Eliasson, Bengt; Daldorff, Lars K. S.

In: Journal of Geophysical Research: Space Physics, Vol. 122, No. 10, 16.10.2017, p. 10638-10650.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Two-dimensional Vlasov simulations of fast stochastic electron heating

AU - Speirs, David Carruthers

AU - Eliasson, Bengt

AU - Daldorff, Lars K. S.

PY - 2017/10/16

Y1 - 2017/10/16

N2 - Ionospheric heating experiments using high frequency ordinary (O) mode electromagnetic waves have shown the induced formation of magnetic field-aligned density striations in the ionospheric F-region. These striations are observed in association with lower-hybrid (LH) and upper-hybrid (UH) turbulence and significant electron heating, further enforcing the striations. High-energy electrons can result in the ionisation of neutrals and the formation of descending artificial ionospheric layers (DAILs). In the current context, we present the results of a two-dimensional (2D) numerical simulation conducted using a Vlasov-Maxwell code to study the mode-conversion of an O mode pump wave to trapped UH waves in a small-scale density striation. Subsequent multi-wave parametric decay is observed leading to UH and LH turbulence and the excitation of large amplitude electron Bernstein (EB) waves. Large-amplitude EB waves result in significant electron heating when the wave amplitude exceeds a threshold value for stochastic motion of the electrons. For typical experimental parameters, the simulated electron temperature is observed to rise from 1500 K to more than 5000 K in a fraction of a millisecond, much faster than the usual Ohmic heating due to collisions which occurs on second-scale. The stochastic electron heating could potentially be one of the mechanisms involved in the formation of DAILs.

AB - Ionospheric heating experiments using high frequency ordinary (O) mode electromagnetic waves have shown the induced formation of magnetic field-aligned density striations in the ionospheric F-region. These striations are observed in association with lower-hybrid (LH) and upper-hybrid (UH) turbulence and significant electron heating, further enforcing the striations. High-energy electrons can result in the ionisation of neutrals and the formation of descending artificial ionospheric layers (DAILs). In the current context, we present the results of a two-dimensional (2D) numerical simulation conducted using a Vlasov-Maxwell code to study the mode-conversion of an O mode pump wave to trapped UH waves in a small-scale density striation. Subsequent multi-wave parametric decay is observed leading to UH and LH turbulence and the excitation of large amplitude electron Bernstein (EB) waves. Large-amplitude EB waves result in significant electron heating when the wave amplitude exceeds a threshold value for stochastic motion of the electrons. For typical experimental parameters, the simulated electron temperature is observed to rise from 1500 K to more than 5000 K in a fraction of a millisecond, much faster than the usual Ohmic heating due to collisions which occurs on second-scale. The stochastic electron heating could potentially be one of the mechanisms involved in the formation of DAILs.

KW - Vlasov-Maxwell simulations

KW - plasma-wave coupling

KW - parametric 8 multi-wave excitation

KW - field aligned striation

KW - stochastic electron heating

KW - DAILS

KW - decending artificial iono- 14 spheric layers

UR - http://agupubs.onlinelibrary.wiley.com/hub/jgr/journal/10.1002/(ISSN)2169-9402/

U2 - 10.1002/2017JA024665

DO - 10.1002/2017JA024665

M3 - Article

VL - 122

SP - 10638

EP - 10650

JO - Journal of Geophysical Research: Space Physics

T2 - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 10

ER -