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BEGIN:VEVENT
DTSTAMP:20260428T021523Z
DTSTART;VALUE=DATE-TIME:20201130T130000
DTEND;VALUE=DATE-TIME:20201130T140000
SUMMARY:Daniel Verscharen (UCL): Kinetics of solar-wind electrons: expans
 ion\, instabilities\, and collisions
TZID:Europe/London
UID:20201130-8a1785d7756ec68b01756ffe72ce2011@warwick.ac.uk
CREATED:20201123T114901Z
DESCRIPTION:Abstract: The electron distribution function in the solar win
 d consists of three main populations: a thermal core\, a suprathermal\, 
 quasi-isotropic halo\, and a field-aligned beam called “strahl”. In cont
 rast to the protons\, the electrons are a sub-sonic particle population\
 , and due to their small mass\, they contribute little to the overall mo
 mentum flux of the solar wind. However\, their unique kinetic properties
  supply the solar wind with a significant heat flux. We investigate the 
 regulation of this heat flux by kinetic microinstabilities. I will prese
 nt a mathematical framework for the description of electron-driven insta
 bilities and discuss the associated physical mechanisms. We find that an
  instability of the oblique fast-magnetosonic/whistler (FM/W) mode is th
 e best candidate for a microinstability that regulates the strahl heat f
 lux by scattering strahl electrons into the halo population\, consistent
  with spacecraft measurements. We derive approximate analytic expression
 s for the FM/W instability thresholds and confirm their accuracy through
  comparison with numerical solutions to the hot-plasma dispersion relati
 on. The comparison of our theoretical results with a large statistical d
 ataset from the Wind spacecraft confirms the relevance of the oblique FM
 /W instability for the solar wind. In addition\, we find a good agreemen
 t between our theoretical results and numerical solutions to the quasili
 near diffusion equation. I will present our results in the context of th
 e latest measurements from Parker Solar Probe and Solar Orbiter.
LOCATION:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20201123T114901Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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