[IGPP Everyone] REMINDER! SEMINAR TODAY, 3:30 PM 6704 GEOLOGY ANNA TENERANI !!! ALFVENIC FLUCTUATIONS IN THE SOLAR WIND !!!

[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


3:30 - 5:00 PM


In Charge

M. Velli.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.igpp.ucla.edu/pipermail/everyone/attachments/20181005/105010cb/attachment.html>