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A remnant planetary core in the hot-Neptune desert
(Nature Publishing Group, 2020-07)
The interiors of giant planets remain poorly understood. Even for the planets in the Solar System, difficulties in observation lead to major uncertainties in the properties of planetary cores. Exoplanets that have undergone ...
Long-term solar activity influences on South American rivers
(Elsevier, 2011-02)
River streamflows are excellent climatic indicators since they integrate precipitation over large areas. Here we follow up on our previous study of the influence of solar activity on the flow of the Parana River, in ...
Ion acoustic damping effects on parametric decays of Alfvén waves
(Blackwell Publishing Ltd, 2000)
It is well known that in plasmas with β = (νs/νA)2 < 1 (νs is the ion acoustic velocity and νA is the Alfvén velocity), Alfvén waves propagating along an external magnetic field can have three kinds of parametric ...
Electromagnetic instabilities in a gyrotropic and nongyrotropic hybrid solar-wind-like plasma
(Blackwell Publishing Ltd, 1998)
We study the stability of electromagnetic waves for nongyrotropic velocity distribution functions in a solar-wind-like plasma. The dispersion relation is solved numerically in closed form. On the basis of recently reported ...
High energy tail formation due to right-hand polarized ion cyclotron waves
(1995)
Recent observations on board the Ulysses spacecraft show the presence of high velocity “tails” in the proton distribution functions as well as in heavier ion velocity distributions such as alpha particles and oxygen ions. ...
Comparative study of the effect of cold ions and thermal anisotropy on the convective electromagnetic proton cyclotron instability
(1988)
Although the role played by cold ions on the electromagnetic proton-cyclotron instability has been thoroughly investigated, there are some aspects which deserve further attention. Moreover, since the presence of ion cyclotron ...
Electromagnetic ion-beam-plasma instabilities
(1998)
It is well known that ion beam-plasma interactions can destabilize right- and left-hand polarized electromagnetic waves. However, these instabilities have been studied for frequencies less than the ion-beam gyrofrequency, ...
Damping effects on parametric decays of Alfvén waves
(2001)
It is shown that damping effects can destabilize regions that are stable under non-dissipative fluid theory. Damping effects on the ion-acoustic modes are simulated by a collisional-like term in the longitudinal component ...
Growth rates of envelope modulations of electromagnetic waves in relativistic temperature electron-positron plasmas, stimulated by weak or finite phonon damping
(1997)
We study the modulational instability of an electron-positron plasma with relativistic temperatures and phonon damping. It is shown that when the phonon damping is O (1) or O (ε), a modulational instability appears even ...
Parametric decay of a circularly polarized electromagnetic wave in an electron-positron magnetized plasma
(1997)
We study the parametric decays of an electromagnetic wave propagating along an external magnetic field in an electron-positron plasma. We include weakly relativistic effects on the particle motions in the wave field, and ...