ELFT HÍRADÓ

[uhlar AT konkoly.hu (Karola_Uhlar)]

                                Meghívó
                 az  MTA CSFK Csillagászati Intézete 
                             szemináriumára

Elõadó: Erdélyi Róbert (SP2RC, Sheffield University, UK)

Cím: Solar Magneto-Seismology: Are we close to solve one of the great 
problems of modern astrophysics?
        
Kivonat:
The latest satellite and ground-based observations have provided a wealth 
of evidence of waves and oscillations present in the solar atmosphere. Our 
understanding of the structure and dynamics of the solar atmosphere has 
been considerably changed in light of the high spatial and time resolution 
observations (e.g. DST/ROSA, IBIS, CoMP, STT/CRISP; SOHO, TRACE, STEREO, 
Hinode, SDO, etc.) allowing us to perform sub-resolution 
magneto-seismology of MHD waveguides. First I will outline the recent 
developments in MHD wave theory focussing on linear waves. Next, I will 
concentrate on the role of Alfven waves, and will discuss the latest 
status of the sometimes controversial observations of these particular, 
and fundamentally important waves. Our theoretical interpretations of the 
detected Alfven wave and oscillatory phenomena within the framework of MHD 
will be shown. The photospheric origin and generation mechanism of these 
(and other) peculiar waves is addressed numerically. We will show how MHD 
(slow, fast and Alfven) waves penetrate into the chromosphere, transition 
region or even into the corona. The coupling role of the magnetic field 
for MHD waves and oscillations between the solar interior and atmosphere 
will be addressed briefly. Finally, we conclude how solar 
magneto-seismology evolved with MHD waves and how the new observational 
data on waves can be used for a more accurate solar and stellar 
atmospheric diagnostics, including such important aspects as e.g. 
determining (i) the extent of the force free (or not!) nature of the solar 
and stellar atmosphere, (ii) the geometry, (iii) fine structure, and (iv) 
even the heating mechanism(s) of solar and stellar coronal plasmas.

Az elõadás idõpontja: 2012. május 17., csütörtök 14 óra 

Helye: MTA CSFK CSI elõadóterme 
Budapest, XII., Konkoly Thege M. út 15-17.