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SUMMARY:The distortion of radio observations by the heliosphere - Nicolina
  Chrysaphi (Sorbonne)
DTSTART:20240528T120000Z
DTEND:20240528T130000Z
UID:TALK215839@talks.cam.ac.uk
CONTACT:Dr Dolev Bashi
DESCRIPTION:Radio photons can interact with heliospheric density fluctuati
 ons that\ninfluence their observed properties\, whether the photons have s
 olar or\nextra-solar origins.  I will demonstrate the importance of accoun
 ting\nfor such interactions\, with particular focus on scattering which is
  the\ndominant radio-wave propagation effect.  By combining observations o
 f\nsolar radio bursts and simulations\, we showed that scattering is\nanis
 otropic and that ignoring its effects can be detrimental to any\ninference
 s made from observations.  Such anisotropy also induces a\ndependence of r
 adio measurements on the observer’s angular position\,\nincluding on the
  observed size\, position\, and flux.  However\, we\nrecently employed an 
 improved fitting method and analysed multi-vantage\nobservations from four
  angularly-separated spacecraft\, identifying the\ndecay and rise times as
  the only radio burst measurements which are\nindependent of the observer
 ’s position.  We also identify scattering\neffects as an important contr
 ibutor to the rise phase of the solar radio\nlight curves we record\, addi
 ng to our understanding of the plasma\nemission mechanism.
LOCATION:Hoyle Committee Room + ONLINE - Details to be sent by email
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