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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20150219T103000
DTEND;TZID=Atlantic/Canary:20150219T113000
UID:iactalks-759
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/759
CREATED:2015-02-19T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Collisional phenomena in the lower solar atmosphere 
DESCRIPTION:Collisional phenomena in the lower solar atmosphere \nDr. Jovo 
 Vranjes\n\nThe lower solar atmosphere is very weakly ionized, and by condu
 ctivity  it is comparable to the sea water. The collisional frequency for 
  electrons and ions can be over 10^10 Hz and 10^9 Hz, respectively. This  
 implies that particles may not be magnetized and are thus unaffected by  t
 he magnetic field. In this talk I shall present accurate collision  cross 
 sections and collision frequencies for electrons, protons and  hydrogen at
 oms, and the corresponding transport coefficients for layers  with both un
 magnetized and magnetized particles. The cross sections  include many esse
 ntial effects like charge exchange,  quantum-mechanical  in-distinguishabi
 lity at low energies, polarization of neutral atoms by  external charges, 
 and dependence on energy of colliding particles. The  effects of collision
 s on Alfven waves will also be discussed.
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