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SUMMARY:The expansion of active regions into the heliosphere - Dr. Huw Mor
 gan (University of Aberystwyth)
DTSTART:20131104T160000Z
DTEND:20131104T170000Z
UID:TALK48160@talks.cam.ac.uk
CONTACT:Dr. Jaroslav Dudik
DESCRIPTION:Image processing is important to reveal new phenomena in solar
  and coronal observations. A new method is presented which can greatly inc
 rease the amount of visual information available from EUV observations of 
 the lower corona. Another method isolates the signal emitted by dynamic ph
 enomena in white-light coronagraph observations\, thus enabling the study 
 of very faint moving structures in the extended corona. Recently\, these n
 ovel methods have revealed for the first time the expansion of active regi
 ons out to very large heights in the corona (>15Rs). This is a surprising 
 result\, since the current understanding is that closed-field active regio
 n plasma can contribute only indirectly to the solar wind through eruptive
  events such as small-scale reconnection or larger CMEs. This result has i
 mplications for current models linking the Sun and heliosphere. It also su
 ggests an alternative (albeit intermittent) source to the highly-variable 
 slow wind and provides a new\, simple interpretation of certain\ncharacter
 istics of _in situ _measurements. 
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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