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BEGIN:VEVENT
DTSTAMP:20260615T074306Z
DTSTART;VALUE=DATE-TIME:20161024T150000
DTEND;VALUE=DATE-TIME:20161024T160000
SUMMARY:Mathew Owens (Reading): 'Global solar wind variations over the la
 st four centuries'
TZID:Europe/London
UID:20161024-094d434556928aad0156b1a04fd869ae@warwick.ac.uk
CREATED:20160822T094128Z
DESCRIPTION:Abstract: Direct spacecraft measurements of the solar wind an
 d heliospheric magnetic field have been performed near-continuously for 
 the over 60 years. The solar wind is seen to vary over all observed time
  scales\, from subseconds to decades\, with strong evidence of secular t
 rends. In order to fully assess the longer-term variations\, it is neces
 sary to use proxy data. Approximately 170 years of geomagnetic data can 
 be used to provide extremely accurate reconstructions of the near-Earth 
 solar wind speed and the heliospheric magnetic field intensity on annual
  time scales\, and consequently the open solar flux. Prior to 1845\, it 
 is necessary to go to more indirect proxies for solar wind conditions. S
 unspot number can be used with simple empirical relations and open solar
  flux modelling to provide estimates of the near-Earth conditions back t
 o ∼1610. Of course\, such reconstructions are only as accurate as the su
 nspot records which underpin them\, but by taking an ensemble approach\,
  the uncertainties can be both reduced and quantified. Extending further
  back in time is possible through the use of cosmogenic isotope records 
 in natural reservoirs such as tree trunks and ice cores. Teasing out the
  solar wind signal requires detailed modelling of the Earth system and h
 ence the time resolution is generally sub-annual and the uncertainties g
 reater than with geomagnetic and sunspot methods. Nevertheless\, the lon
 g-term evolution of the solar magnetic field can be inferred over nearly
  10\,000 years.
LOCATION:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20161003T115457Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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