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A firehose-like aperiodic instability of counter-beaming electron plasmas
(IOP Publishing, 2020)
Depending on the physical conditions involved, beam plasma systems may reveal new unstable regimes triggered by wave instabilities of different natures. We show through linear theory and numerical simulations the existence ...
The effect of compressibility on the primary global instability of unforced laminar separation bubbles
(2019-12-01)
Laminar separation bubbles present a three-dimensional self-excited instability mechanism which leads to the appearance of spanwise-periodic structures. In incompressible flow, this mechanism was found to become active at ...
Nonlinear Electrostatic Ion-Acoustic-Like Instabilities in a System with Two Streaming Ion Components Moving in a Background Plasma
(Bentham open, 2008-11-26)
Finite amplitude Alfvén-cyclotron waves are believed to play an important role in coronal heating and
nonthermal properties of velocity distribution functions. These effects are thought to be due to parametrically ...
On the plasma instability mechanisms responsible for Esq
(American Geophysical Union, 1976-03-01)
Evidence is presented showing that the gradient drift (type 2) irregularities are the most probable scatterers responsible for equatorial sporadic E (Esq) echoes observed on conventional equatorial ionograms and that the ...
Radar scatter from equatorial electrojet waves: An explanation for the constancy of the Type I Doppler shift with zenith angle
(American Geophysical Union, 2008-02-26)
The first results from the 430 MHz Advanced Modular Incoherent Scatter Radar Prototype (AMISR‐P) at the Jicamarca Radio Observatory were reported by Hysell et al. (2007). We present additional data showing that the phase ...
Unexpected rapid decrease in phase velocity of submeter Farley-Buneman waves with altitude
(American Geophysical Union, 2008-02-09)
An unexpected and drastic drop in the phase velocity Vph of Farley‐Buneman (FB) waves with increasing altitude was observed in the equatorial electrojet over Jicamarca. The effect was detected with the newly employed 430‐MHz ...
Relationship between the ionospheric eastward electric field and the equatorial electrojet
(American Geophysical Union, 2010-02-26)
The equatorial electrojet (EEJ) is a strong ionospheric current along the magnetic equator driven by the day side eastward electric field. Current strength is affected by two‐stream and gradient‐drift instabilities which ...
Wavepacket models for subsonic twin jets using 3D parabolized stability equations
(2018-10-01)
An extension of the classical parabolized stability equations to flows strongly dependent on the two cross-stream spatial directions and weakly dependent on the streamwise one is applied to model the large-scale structures ...
Turbulent transport mechanisms on the heat confinement in tunnels by using low-velocity air curtains
(Pergamon-Elsevier, 2020)
Simulations with the Fire Dynamics Simulator (FDS) were performed to study the ability of Double Stream-Twin Jets (DS-TJ) air curtains to confine heat. Numerical simulations aimed to model a 1:34 scale tunnel, equipped ...
Genetic isolation among mountains but not between stream types in a tropical high-altitude mayfly
(BLACKWELL PUBLISHING LTD, 2016-05-01)
Glaciers that directly feed high-altitude streams create unique environmental conditions that contribute substantially to regional-scale lotic habitat diversity and biodiversity, including intra-specific genetic diversity ...