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SUMMARY:A decomposition of northern polar external magnetic fields using t
 he method of Empirical Orthogonal Functions - Dr. Robert Shore (BAS)
DTSTART:20160606T150000Z
DTEND:20160606T160000Z
UID:TALK64908@talks.cam.ac.uk
CONTACT:Andrew Hillier
DESCRIPTION:We present a reanalysis of ground-measured geomagnetic field d
 ata at 5-minute resolution\, spanning 11 years (a full solar cycle).  Our 
 aim is to resolve the dominant structures (i.e. modes of variability) in t
 he Earth’s external magnetic fields\, which are generated by interaction
  between the terrestrial and solar magnetic fields in near-Earth space.  T
 he external magnetic fields are the single largest source of error in effo
 rts to model the Earth’s internal magnetic field – essential for navig
 ation and resource exploration.\n\nA major focus of our reanalysis is to a
 void making assumptions about the nature of the external fields\, and let 
 the data ‘tell us’ how to best resolve them.  Hence\, we employ a (com
 monly-used) pattern-finding method called Empirical Orthogonal Functions (
 EOFs)\, also called Principal Component Analysis (PCA).  EOF is typically 
 used as a ‘breadth-first’ tool in initial assessments of the structure
  of a given dataset.  Here we show that with appropriate processing\, EOF 
 analysis can be used to good effect in the completion and decomposition of
  a sparse set of magnetic field data\, aiding subsequent interpretation an
 d prediction.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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