ELFT HÍRADÓ

[ilka AT konkoly.hu (Kalman Belane)]

                                  Meghivó
              az MTA KTM Csillagászati Kutatóintézete 
                             szemináriumára                        

                        Rendkívüli idõpont!

Elõadó: Munetaka Ueno
        (University of Tokyo) 

Cím:"Visible and infrared observations of the interplanetary dust"

Abstract:
Lifetime of the interplanetary dust under the Poynting-Robertson drag
is much shorter than the age of the Solar System, which leads that some
supply sources must exist in the present Solar System, as well as the
Vega-like stars. The birth of Infrared Astronomical Satellite (IRAS)
dramatically changed this smooth featureless picture of the zodiacal
dust cloud by revealing numerous bands of asteroidal debris, several
narrow trails of cometary dust, and a clumpy dust ring just outside the
Earth's circumsolar orbit. The IRAS has thus renamed the used to be
featureless zodiacal cloud as interplanetary dust cloud complex.
However, due to sparse coverage of solar elongation angle, the IRAS data
alone may not tell us much about the intermediate scale structures in
the visible zodiacal light.  In the beginning of 1990s the COBE/DIRBE
mapped almost entire sky with a 0.7 arc-degree size beam and with
established calibration.  One of the most exciting results of the
COBE/DIRBE mission is a full confirmation of the mean motion 
resonance(MMR) of the dust ring, and an isolation of the leading and 
trailing blobs in the MMR feature.  The AKARI mission's coverage of the 
solar elongation angle is pretty limited to very narrow span from 89.5 to 
91.5 arc-degree, however the AKARI mission is proud of its superbly high 
sensitivity and commands its sharp vision of fine spatial resolution.  
Furthermore, its wavelength coverage is ideally tuned for studying local 
IPDs and the IPD cloud as well.  Topics on the large scale mapping of the 
IDP cloud, and spectroscopy of the zodiacal emission will be discussed in 
the talk, and will cover the recent progress of visible observations 
of the zodiacal light by our team.

Keywords: Infrared Astronomical Satellite "AKARI",  Interplanetary dust

Az elõadás idõpontja: 2009. február 4, (szerda !) 14 óra 

Helye:   MTA KTM Csillagászati Kutatóintézete 
         1121 Budapest, Konkoly Thege Miklós u. 13-17

Patkós László s.k.