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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3693
DTSTART:20150416T204500Z
DTEND:20150416T220000Z
DTSTAMP:20260414T124941Z
LAST-MODIFIED:20150331T125933Z
LOCATION:4421 Sterling Hall
SUMMARY:A solar close-up view of physical processes in magnetized plas
 mas \, Astronomy Colloquium\, Paola Testa\, Harvard CfA
DESCRIPTION:Observations of the solar outer atmosphere provide us with
  a close up view of fundamental physical processes that occur in magne
 tized plasmas in many other astrophysical environments. I will present
  recent results and discuss the insights we have gained into the mecha
 nisms converting magnetic energy into atmospheric heating and particle
  acceleration\, and other processes relevant to different astrophysica
 l contexts such as accretion on pre-main sequence stars.<br>
\nI will 
 focus in particular on results from the recently launched Interface Re
 gion Imaging Spectrograph (IRIS)\, which provides us with an unprecede
 nted detailed view of the solar chromosphere and transition region (i.
 e.\, the interface region between the gas dominated photosphere and th
 e magnetically dominated corona). IRIS allows detailed diagnostics of 
 the plasma structuring and dynamics through its high resolution NUV an
 d FUV spectroscopic data in combination with high spatial resolution (
 ~0.3") slit-jaw imaging (SJI).  I will also discuss the role of state-
 of-the-art radiative atmospheric models which are necessary forp the i
 nterpretation of the emission of plasma from this interface region\, b
 ecause of e.g.\, optical thickness effects\, and partial ionization. 
URL:https://www.physics.wisc.edu/events/?id=3693
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