Morphology of the M ar tian Dark Dune Spots. András Horváth Konkoly Observatory, TIT Budapest Planet a rium , email@example.com (Előadás az MTA Geonómiai Bizottságának Szádeczky-emlékülésén, 2003. okt. 21.-én). Co-workers:. Tibor Gánti emeritus professor of theoretical biology
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TIT Budapest Planetarium,
(Előadás az MTA Geonómiai Bizottságának Szádeczky-emlékülésén, 2003. okt. 21.-én)
emeritus professor of theoretical biology
biology professor, Eötvös University and permanent fellow of the Collegium Budapest, Szaniszló Bérczi,
associate professor, Eötvös University
dep.director, TIT Budapest Planetárium
Introduction-IDark dune spots (DDSs) are annually recurring geomorphological features of martian dark dunes located between the South Pole and –50 degrees latitude
Introduction-IIFrost cover first appears on dark dunes in autumn. They defrost towards the second half of winter and in spring, when dark spots are formed.
can be explained by a
of DDS formation
crater-like holes in the layer of precipitated snow/ice.
the spots are elongateddownwards,
fan-like shape or creek-like flows
of the slope.
from winter to summer.
Observations – VIDDSs have a massiv annual reappearanceon the same places. The dinamics of the reappearance depend on local meteorological condicions.
on the soil,below the ice, warm up by theabsorption ofsunlight andmelt the water ice
The CO2 ice coverdisappears
in the center,
where the meltingstarts.
When water evaporates the organismsdessicate and
the dark naked soil
can be seen.
Efficient pigments –water lens
–UV screening and
insulation by ice layer
– liquid phase:
wateris abundant in the soil
–several months for reproduction
– terrestrial analogues
ConclusionIf the biogenic hypothesis is correct, it means that, at exceptional sites and under exceptional circumstances, photosynthetic organisms still dwell on the Martial surface.This claim will be substantiated as far as possible by the extensive use of the data obtained by the Mars Express mission.
Proposal for MARS EXPRESS – IMars Express coud provide imaging and spectroscoping observations for detailed study of the dynamics of DDSs on the selected areas (Pityusa Patera and Inca City region)