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SUMMARY:Non-Linear Force-Free Models of the Sun's Magnetic Field - Duncan 
 MacKay (St Andrews)
DTSTART:20110509T150000Z
DTEND:20110509T160000Z
UID:TALK31168@talks.cam.ac.uk
CONTACT:Henrik Latter
DESCRIPTION:The seminar will describe recent attempts to model magnetic fi
 elds in the\nsolar corona using the non-linear force-free approximation. T
 o begin with\na new global model which is based on observational data will
  be described.\nThe model is designed to simulate the large-scale evolutio
 n of\nphotospheric and coronal magnetic fields on the Sun over long\nperio
 ds of time (weeks-months).Once the construction of the model is\ndiscussed
  two tests of the model are carried out. First it is tested with\nobservat
 ions of the hemispheric pattern of solar filaments and secondly\nwith IMF 
 measurements of the Sun's Open Flux. Following on from\nthis non-linear fo
 rce-free simulations are carried out of the dispersal of\nan active region
 . Results show that small scale convective motions may\nprovide sufficient
  energy to explain the radiative losses in the corona.\nFinally future app
 lications of the model will be discussed.\n
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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