# Emission of radiation induced by pervading AlfvÃ©n waves

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AlfvÃ©n cyclotron instabilities excited by velocity gradients of energetic beam ions were investigated in MAST experiments with super-Alfvenic neutral beam injection over a wide range of toroidal magnetic fields from ~0.34 T to ~0.585 T. In MAST discharges with high magnetic field, a discrete...

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Previous studies (e.g., Malara et al., Astrophys. J. 533, 523 (2000)) considered small-amplitude Alfven wave (AW) packets in Arnold-Beltrami-Childress (ABC) magnetic field using WKB approximation. They draw a distinction between 2D AW dissipation via phase mixing and 3D AW dissipation via...

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AlfvÃ©n waves are low-frequency transverse waves propagating in a magnetized plasma. We define the AlfvÃ©n frequency Ï‰0 as Ï‰0=kVAcosÎ¸, where k is the wave number, VA is the AlfvÃ©n speed, and Î¸ is the angle between the wave vector and the ambient magnetic field. There are...

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In the present work, we have discussed the effects of adiabatic trapping of electrons on obliquely propagating AlfvÃ©n waves in a low Î² plasma. Using the two potential theory and employing the Sagdeev potential approach, we have investigated the existence of arbitrary amplitude coupled...

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The dispersion relation of Alfven waves have been theoretical studies by kinetic approaches. Dispersion relation of Alfven waves are measured in multi-component magnetosphere plasma consisting of mixture of hydrogen (H+), helium (He+) and Oxygen (O+) ions in magnetized cold plasma. The wave is...

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The effects of both density stratification and magnetic field expansion on torsional AlfvÃ©n waves in solar spicules are studied. Also, their eigenfrequencies, eigenfunctions, and the period ratio P/ P are obtained with a novel mathematical method. We showed that under some circumstances this...

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Reversed shear AlfvÃ©n eigenmodes (RSAEs) usually sweep upward in frequency when the minimum value of the safety factor qmin decreases in time. On rare occasions, RSAEs sweep downward prior to the upward sweep. Electron cyclotron emission measurements show that the radial eigenfunction during...

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A multi-dimensional nonlinear evolution equation for AlfvÃ©n waves in weakly-expanding solar wind plasmas is derived by using the reductive perturbation method. The expansion of solar wind plasma parcels is modeled by an expanding box model, which includes the accelerating expansion. It is...