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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20080605T000000
DTEND;TZID=Atlantic/Canary:20080605T010000
UID:iactalks-202
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/202
CREATED:2008-06-05T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Parker spontaneous current-sheets in topologically untwisted magnet
 ic fields
DESCRIPTION:Parker spontaneous current-sheets in topologically untwisted ma
 gnetic fields\nProf. Boon-Chye Low\n\nA continuous magnetic field evolving
  under the hydromagnetic frozen-in condition preserves its field topology.
    Depending on that field topology, the evolving field may inevitably dev
 elop electric current-sheets, i.e., magnetic tangential discontinuities, i
 n the course of nonlinear fluid-field interaction.  This inevitability obt
 ains for all field topologies one could prescribe for the field, except th
 ose of a special subset of measure zero.   This theory of Eugene Parker is
  based on demonstrating that a field endowed with a fixed topology cannot 
 generally find an equilibrium state in which the field is everywhere spati
 ally continuous.  I will discuss a recent development of this magnetostati
 c problem from an intuitive point of view, giving a basic understanding of
  why current sheets not only form easily but do so throughout a magnetic f
 ield.  Parker’s theory explains the heating of the solar corona, to 
 million-degree temperatures, in terms of spontaneous current sheets that m
 ust form because of high electrical conductivity, and, yet, must dissipate
  in spite of that high (but finite) conductivity. This process may be the 
 fundamental reason for the high-temperature plasmas found almost everywher
 e in the astrophysical universe
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