Results 211 to 220 of about 2,743,097 (252)
Multiradar observations of substorm‐driven ULF waves
Journal of Geophysical Research: Space Physics, 2016 A recent statistical study of ULF waves driven by substorm-injected particles observed using Super Dual Auroral Radar Network (SuperDARN) found that the phase characteristics of these waves varied depending on where the wave was observed relative to the ...
M K James, T K Yeoman, Pavel N Mager
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ULF Waves in the Magnetosphere
Reviews of Geophysics, 1991Research efforts in the area of magnetospheric ULF waves in the 1987-1990 period are reviewed. Attention is given to externally excited hydromagnetic waves including field line resonance, the global cavity mode, bow-shock-associated upstream waves, and Kelvin-Helmholtz waves.
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ULF Waves: Conjugated Ground-Satellite Relationships
Space Science Reviews, 1978We study the simultaneous occurrence of ULF waves observed on board GEOS and at two of its ‘conjugated’ stations: Husafell (Iceland) and Skibotn (Norway). We try to deduce some properties of the regions in which these waves are generated. The few number of simultaneous observations of ‘pearl’ events indicates that such structured oscillations can occur
Roger Gendrin +4 more
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Electron Resonant Interaction With Coherent ULF Waves: Hamiltonian Approach
Journal of Geophysical Research: Space PhysicsElectron resonant interaction with ultra‐low‐frequency (ULF) waves is considered to be a driver of electron radial transport in Earth’s inner magnetosphere. Traditional concept of such interaction assumes the electron slow diffusive scattering by a broad‐
A. Artemyev +6 more
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ULF Waves Observed by Lunar Prospector
Journal of Geophysical Research: Space Physics, 2021AbstractWe have studied the spatial distribution of ultra‐low frequency (ULF) in the vicinity of the Moon using Lunar Prospector (LP) magnetometer data obtained at ∼100 km altitude during the period from February 20, 1998 to November 30, 1998. The lunar ULF waves are mostly identified over a broad frequency range of 10–60 mHz in the spacecraft frame ...
Seul‐Min Baek +4 more
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ULF waves on the ground and in space
Journal of Atmospheric and Terrestrial Physics, 1990Abstract The progress in the study of ULF waves in the Earth's magnetosphere made between 1987 and 1989 is reviewed. Topics addressed in the review include satellite and ground-based observations of ULF wave spatial structure, ULF wave resonators and waveguides in the magnetosphere and ionosphere, the ionosphere as a ‘passive screen’ and an ‘active ...
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A study of ULF wave foreshock morphology—I: ULF foreshock boundary
Planetary and Space Science, 1992Abstract We have used ISEE 1 and 2 magnetometer data to determine the forward boundary of the upstream ULF wave foreshock. We first examine the presence and absence of ULF waves immediately upstream from the bow shock. The statistical results show that the ULF foreshock starts at θBn ∼ 50° on the bow shock, and fills the entire upstream region ...
G. Le, C.T. Russell
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ULF waves in planetary magnetospheres
2006Ultra-low frequency (ULF) waves are messengers in space plasmas. They communicate information about unstable, free-energy-containing plasma configurations, transient phenomena, or obstacles in flowing plasmas; they transport energy between different parts of magnetospheric systems; and they serve as momentum coupling agents between remote regions such ...
Karl-Heinz Glassmeier, Jared Espley
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ULF Waves Modulating and Acting as Mass Spectrometer for Dayside Ionospheric Outflow Ions
Geophysical Research Letters, 2019Ionospheric outflow has been shown to be a dominant ion source of Earth's magnetosphere. However, most studies in the literature are about ionospheric outflow injected into the nightside magnetosphere.
Zheng Liu +11 more
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Planetary and Space Science, 1983
Abstract Recent theoretical work has predicted the possible existence of “quarter-wave” ULF pulsation resonances, in which the wave electric field has a near-node in one ionosphere and an antinode in the conjugate ionosphere. Eigenvalues are derived for quarter-wave toroidal and guided poloidal resonances for a range of L -values and plasma density ...
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Abstract Recent theoretical work has predicted the possible existence of “quarter-wave” ULF pulsation resonances, in which the wave electric field has a near-node in one ionosphere and an antinode in the conjugate ionosphere. Eigenvalues are derived for quarter-wave toroidal and guided poloidal resonances for a range of L -values and plasma density ...
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