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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20160308T123000
DTEND;TZID=Atlantic/Canary:20160308T133000
UID:iactalks-870
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/870
CREATED:2016-03-08T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY: On fast numerical methods in the solution of the NLTE line transfe
 r problem
DESCRIPTION: On fast numerical methods in the solution of the NLTE line tra
 nsfer problem\nDr. Olga Atanackovic\n\nRadiative transfer is underlying ph
 ysical phenomenon in many astrophysical problems and among the most diffic
 ult phenomena to deal with. The main difficulty arises from the non-local 
 and, in general, non-linear coupling of the radiation field and the state 
 of the gas. A variety of numerical methods have been developed so far to s
 olve the NLTE radiative transfer in spectral lines (NLTE line formation pr
 oblem). An overview of selected methods will be given in the talk. Special
  emphasize is put on two extremely fast convergent methods: Iteration Fact
 ors Method (IFM) and Forth-and-Back Implicit Lambda Iteration (FBILI) that
  use the so-called iteration factors in an explicit and implicit way, resp
 ectively. Although these methods are developed to solve the general non-li
 near multi-level problem, their basic ideas and properties are demonstrate
 d on the well-known test-problem of the two-level atom line formation unde
 r the assumption of complete redistribution.
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