[IGPP Everyone] SEMINAR SERIES FALL 2018 : October 5, 2018!

[MARCO VELLI]

>
> SPACE PHYSICS SEMINAR
>
> DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES
>
> DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES
>
> UNIVERSITY OF CALIFORNIA, LOS ANGELES
>
>
> ANNA TENERANI, EPSS, UCLA
>
>
> Kinetic Effects on the Stability of Alfvénic Fluctuations
>
>
> One of the outstanding problems in Heliophysics and Astrophysics in
> general is the origin of stellar coronae and winds. Alfvén waves, which
> can easily propagate along magnetic field lines from the cooler photosphere
> to the hot corona and above, are thought to provide a possible mechanism to
> supply the energy required to heat the solar corona and boost the solar
> wind through turbulent dissipation and Reynolds stresses. Large amplitude,
> turbulent Alfvénic fluctuations have indeed been observed in the solar wind
> fast streams for over fifty years. Nevertheless, their nonlinear evolution
> in the solar wind remains to be understood in many details. Perhaps one
> of the most surprising and yet unexplained property of such Alfvénic
> fluctuations is that the magnitude of the total magnetic field remains
> nearly constant with negligible associated density fluctuations, even in
> correspondence of the largest amplitudes.  In this talk we will address
> the problem of the existence, dynamical accessibility and stability of
> constant-B nonlinear states in anisotropic plasmas and we will discuss
> possible implications for the recently launched Parker Solar Probe.
>
>
>
> Friday, OCTOBER 5th, 2018
>
>
> Room 6704 Geology
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>
> 3:30 - 5:00 PM
>
>
> In Charge
>
> M. Velli.
>
>
>
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