ELFT HÍRADÓ

[Forgacsne Dajka Emese <andro AT astro.elte.hu>]

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                     ORSZAGOS CSILLAGASZATI SZEMINARIUM
                         Moderalt Levelezesi Listaja

          Listara valo jelentkezes, lejelentkezes ill. hozzaszolas 
                           az alabbi e-mail cimen:
  
                           
ocsszlev AT astro.elte.hu
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                            Tisztelt Kollegak!
                        

                                 MEGHIVO




Szeretettel meghivjuk Ont az ELFT Csillagaszati Szekcioja es az ELTE
Csillagaszati Tanszek altal szervezett Orszagos Csillagaszati Szeminarium
kovetkezo eloadasara.


A kovetkezo eloadas:


    Eloado neve:   Jim Howard (University of Colorado)
    Eloadas cime:  Charged Dust Dynamics in Planetary Magnetosperes

    Eloadas idopontja: 2001. januar 23. (kedd) 14 ora 30 perc 
    Eloadas helye:     Budapest XI. Pazmany Peter setany 1/A.
                       6. emelet 6.54 terem 


                           Abstarct
                           
The study of dusty plasmas is an emerging field that bridges the
traditionally separate subjects of celestial mechanics and plasma
physics. The motion of a charged dust grain can be very complex as it
responds to electromagnetic as well as gravitational forces. Furthermore
the surface charge on a dust grain can vary in time due to photoelectric
and magnetospheric charging currents. In this talk I shall describe recent
work on dust dynamics in planetary magnetispheres, particulary that of 
Saturn. 
Single particle motion is described by Hamiltonian 
model which includes the electric field produced by Saturn's rotating
magnetic dipole field, as well as the oblateness of its gravitational field. A
complex network of potencial wells is discovered, whose global
bifurcations control orbital stability. As a result, "halo" orbits, floating 
above or below the equatorial plane are possible. Explicit Lyapunov
stability boundaries will be given and predictions made for the upcoming 
Cassini mission to Saturn.



                 MINDEN ERDEKLODOT SZERETETTEL VARUNK!


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                     ORSZAGOS CSILLAGASZATI SZEMINARIUM       
    
               Helyszine: Budapest XI. Pazmany Peter setany 1/A.
                          6. emelet 6.54 terem
               Tovabbi informacio: http://astro.elte.hu
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