"MHD turbulence in the solar wind," by Marco Velli (UCLA)

Date: 
Thursday, May 21, 2015 - 1:00pm to 2:00pm
Series: 
Plasma Seminars

Plasma Seminar

Physics & Astronomy Building (PAB) Room 4-330
Thursday, May 21, 2015
1-2PM
Refreshments at 12:30PM

Guest Speaker: Marco Velli (UCLA)

Talk Title: "MHD turbulence in the solar wind"

Abstract:

The solar wind displays fluctuations over a very wide range of frequencies, with energy distributions displaying power laws of variable spectral index as a function of distance, wind-type and moment of solar activity cycle. While typical slow wind streams display what might appear as a standard form of compressible MHD turbulence, fast solar wind streams are more typically the seat of so-called Alfvénic turbulence, dominated by what appear to be nonlinear waves outwardly propagating from the Sun (in other words, though all waves are advected outwards by the supersonic and superAlfvénic wind, the turbulence in fast streams has no inward type modes present). This talk will review the status of our understanding of turbulence in the heliosphere, its dynamical role, and the many open questions it poses in basic plasma physics.

Event Attachments: 
Location: 
PAB 4-330