Astronomical Institute of the Academy of Sciences
of the Czech Republic, Ondrejov
Last updated: October 2002
E-mail: borovic [at] asu.cas.cz
Brief Biographical Information:
Scientist at the Astronomical Institute of
the Academy of Sciences of the Czech Republic in Ondrejov (Department of Interplanetary Matter).
Born 1964 in Prague,
1987 graduated in astronomy from the Charles University
in Prague, since 1988 at the Astronomical Institute in Ondrejov, 1993 PhD in astronomy (Thesis: Spectral analysis of a meteor, advisor Zdenek Ceplecha).
Research on Leonid MAC:
- Meteor spectroscopy
- Physics of meteor flight in the atmosphere
- Chemical composition of meteoroids
- Radiation of meteor trains
- Reduction methods for determination of meteor trajectories
Video spectroscopy of meteors and trains.
Related studies of the Leonids in November of 1998 are
J. Borovicka, R. Stork, J. Bocek, 1999, "First results from video spectroscopy of 1998 Leonid meteors", Meteoritics & Planetary Science (in press)
The image below shows a video frame of my slit-less image intensified meteor spectrograph. The meteor
is on the top right. Its light has been pulled appart in its range of colors from the
violet until the infra-red by a grating. From similar
spectra obtained during last year's Leonid campaign, the first evidence for differential
ablation was found: sodium atoms being released
at higher altitudes than magnesium atoms. This is not seen for other meteors and we
conclude that the Leonid meteors break up in an unusual manner, exposing sodium atoms in the
process. A paper on this
issue was accepted for Meteoritics & Planetary Science (Nov. 1999 issue).
During the 1999 Leonid MAC mission, we discovered debris in the afterglow spectrum
of a bright fireball. Analysis reveiled the temperature decay of the ablation plasma,
the composition of the meteoroid, and unusually strong hydrogen emission.
More information can be found here.
In the 2001 Leonid MAC mission, the spectroscopic properties of dust from
different dust trails will be studied, with a range of ages since ejection.
Video frame with a typical low-resolution Leonid meteor spectrum.
A one-dimenstional extraction of the meteor spectrum.