On the Magnetospheric ULF Wave Counterpart of Substorm Onset [PDF]
Journal of Geophysical Research: Space Physics, 2020 AbstractOne near‐ubiquitous signature of substorms observed on the ground is the azimuthal structuring of the onset auroral arc in the minutes prior to onset. Termed auroral beads, these optical signatures correspond to concurrent exponential increases in ground ultralow frequency (ULF) wave power and are likely the result of a plasma instability in ...
A. W. Smith +4 more
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ULF waves and discrete aurora [PDF]
Journal of Geophysical Research: Space Physics, 2012 We present results from the numerical study of ULF waves generated by the ionospheric feedback instability in density cavities. The goal of the study is to explain several spectral features of ULF waves detected on the ground in close vicinity of intense discrete auroral arcs.
A. V. Streltsov +4 more
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Journal of Taibah University for Science, 2022 A Burgers’ equation (BE) is obtained to examine the overtaking interactions of nonlinear ultra-low frequency (ULF) shock waves, in two cases, in non-relativistic and ultra-relativistic degenerate plasmas consisting of inertial mobile heavy-ion fluid and ...
E. F. El-Shamy +5 more
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Polarization properties of standing shear Alfvén waves in non-axisymmetric background magnetic fields [PDF]
Annales Geophysicae, 2007 In this paper we present results concerning periods and polarizations of cold plasma ultra-low frequency (ULF) guided Alfvén waves in a non-axisymmetric geomagnetic field.
K. Kabin +4 more
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Space Weather, 2023 Past studies found that large‐amplitude geomagnetically induced current (GIC) related to magnetospheric Ultra Low Frequency (ULF) waves tend to be associated with periods >120 s at magnetic latitudes >60°, with comparatively (a) smaller GIC amplitudes at
Michael D. Hartinger +11 more
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Physics of Plasmas, 2021 We perform a statistical study of 3-s ultra-low frequency (ULF) waves using Magnetospheric Multiscale observations in the Earth's foreshock region. The average phase velocity in the plasma rest frame is determined to be anti-sunward, and the intrinsic ...
Shan Wang +7 more
semanticscholar +1 more source
High-latitude observations of impulse-driven ULF pulsations in the ionosphere and on the ground [PDF]
, 2003 International audienceWe report the simultaneous observation of 1.6?1.7 mHz pulsations in the ionospheric F-region with the CUTLASS bistatic HF radar and an HF Doppler sounder, on the ground with the IMAGE and SAMNET magnetometer arrays, and in the ...
Menk, F. W. +14 more
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On the Origin of ULF Magnetic Waves Before the Taiwan Chi-Chi 1999 Earthquake
Frontiers in Earth Science, 2021 The ultra low frequency (ULF) electromagnetic (EM) wave activity usually recorded on Earth’s ground has been found to depend on various types of space weather.
Georgios Anagnostopoulos
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Geophysical Monograph Series, Page i-xiv., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
wiley +1 more source
High-latitude HF Doppler observations of ULF waves. 1. Waves with large spatial scale sizes [PDF]
Annales Geophysicae, 1997 A quantitative study of observations of the ionospheric signatures of magnetospheric ultra low frequency (ULF) waves by a high-latitude (geographic: 69.6°N 19.2°E) high-frequency Doppler sounder has been undertaken.
D. M. Wright +2 more
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