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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:4
UID:UW-Physics-Event-8620
DTSTART:20240229T190000Z
DTEND:20240229T200000Z
DTSTAMP:20260413T223501Z
LAST-MODIFIED:20240226T144919Z
LOCATION:B343 Sterling Hall
SUMMARY:Investigations of fundamental Alfvénic Wave Physics\, Plasma 
 Seminar\, Seth Dorfman\, Space Science Institute
DESCRIPTION:nvestigations of fundamental Alfvénic wave physics in the
  laboratory and in space Low frequency Alfvénic waves and fluctuation
 s are ubiquitous in laboratory and space plasmas\, and these fundament
 al modes of a magnetized plasma often serve as building blocks for mor
 e complicated structures and dynamics.  The linear and non-linear prop
 erties of these waves may play key roles in the turbulent solar wind\,
  heating of the solar corona\, and the environment near the Earth's bo
 w shock.  In this seminar\, I will present a vision for how laboratory
  and spacecraft studies focused on these fundamental building blocks c
 an help us develop a more complete picture of important space physics 
 phenomena.
\n 
\nOur recent work on the Large Plasma Device at UCLA su
 ccessfully isolated important non-linear Alfvénic phenomena that may 
 be building blocks of the turbulent solar wind [e.g.\, Dorfman and Car
 ter\, PRL 2016].  Recent results include a proof-of-principle measurem
 ent of the Parametric Decay Instability (PDI) growth rate [Dorfman\, e
 t. al\, in prep]\;  PDI has been previously shown to bound the solar w
 ind parameter space.  We also recorded the first observation of residu
 al energy in a non-linear Alfvén wave interaction [Abler\, et. al\, i
 n prep]\; this is important because residual energy is observed in the
  inertial range of the turbulent cascade (i.e. there is more energy in
  the magnetic than the velocity fluctuations)\, but an MHD Alfvén wav
 e has equal amounts of energy in fluctuations of each type.  On the sp
 acecraft study side\, I will introduce the Earth's ion foreshock as a 
 natural laboratory for wave studies and show a new method to detect th
 e foreshock edge that also has wide implications for the interpretatio
 n of minimum variance techniques commonly used to determine wave prope
 rties [Dorfman\, et. al\, 2023].
\n
\nAfter examining these various ex
 amples\, I will discuss the prospects of a new Solar Wind Machine aime
 d at producing magnetized plasma turbulence in the laboratory for deta
 iled study to complement and extend spacecraft observations [Dorfman\,
  et. al\, Heliophysics Decadal White Paper 2022]. You are invited to j
 oin us on April 18-20 for a workshop to refine physics targets and dev
 elop candidate machine designs: https://urldefense.com/v3/__https://sw
 im24.pa.ucla.edu/__\;!!Mak6IKo!KFIHNXH2QHYodC5ofX3UcRtxQ7aN-mVtohVrPnG
 CoeHgsWgKNwqkQxs4BunGu21gHGDpPJQtUTuwvTjjA2Tj$
URL:https://www.physics.wisc.edu/events/?id=8620
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