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[Fizinfo] Ortvay Kollokvium

Chronological Thread 
  • From: Zsolt Szep <szepzs AT>
  • To: FIZINFO AT lists.kfki.HU
  • Subject: [Fizinfo] Ortvay Kollokvium
  • Date: Tue Sep 25 12:15:01 2001
  • List-archive: <>
  • List-id: ELFT HRAD <>
  • Lista: Ortvay Kollokvium

ELTE Fizika Tanszekcsoport [ELTE]


2001. szeptember 27., csutortok, 15 orakor
Az ELTE Pazmany Peter s. 1/A alatti epuleteben
az 1. emeleti 1.69 eloadoban

Toth Gabor
(ELTE Atomfizika Tsz.)
"Szemi-relativisztikus magnetohidrodinamika"

Kivonatos ismertetes:

Space weather describes the effects of Solar activity on Earth. One of the
challanges in the numerical modeling of space weather is that the propagation
speed, in particular the Alfven speed, can approach the speed of light in the
magnetosphere near the Earth. This poses a severe problem, since the time
steps of an explicit time integration scheme are limited by the
Courant-Friedrichs-Lewy (CFL) numerical stability condition: the waves must
not propagate more than one cell size in one time step. In a well resolved
simulation, the cell size may be as small as several 100 km-s, which limits
the time step to be less than 0.01 or even 0.001 seconds. On the other hand,
typical time scales of the magnetosphere are on the order of minutes.

I will discuss two ways of circumventing the time step limitation: (i)
replacing the classical MHD equations with the semi-relativistic MHD
equations with an artificially lowered speed of light; (ii) implicit time
integration techniques.

Minden erdeklodot szivesen latunk! Az eloadas elott negyed oraval a 1.69 sz.
terem bejarata elott teat szolgalunk fel.
Az eloadas-sorozatrol az interneten az "" cimen talalhato

  • [Fizinfo] Ortvay Kollokvium, Zsolt Szep, 09/25/2001

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