Attempts to explain water loss from Mars - Stephen Brecht (SETITalks)
Δημοσιεύτηκε στις 2 Δεκ 2014
The debate about whether or not Mars ever had life upon it centers on the issue of water.
Was
there water on Mars? If so, where has it gone? One of the
explanations for the water loss focuses on the idea that the solar wind
is removing the water by acceleration ionospheric ions and removing them
from Mars.
The problem is complicated by a variety of
features: the presence of crustal magnetic fields on the surface of
Mars, the photo-chemistry taking place in Mars' atmosphere/ionosphere,
and the solar activity (EUV flux and solar wind behavior), and finally
the small size of Mars. These features make for a very non-linear
interaction which in many regions has little to do with fluid dynamics
but rather plasma kinetics.
In this talk a discussion of these
issues as well as results of kinetic plasma simulations with data
comparisons will be presented. Dr. Brecht will also discuss how the
results from the ongoing MAVEN mission at Mars can be used to test the
presented plasma simulation predictions.
Was
there water on Mars? If so, where has it gone? One of the
explanations for the water loss focuses on the idea that the solar wind
is removing the water by acceleration ionospheric ions and removing them
from Mars.
The problem is complicated by a variety of
features: the presence of crustal magnetic fields on the surface of
Mars, the photo-chemistry taking place in Mars' atmosphere/ionosphere,
and the solar activity (EUV flux and solar wind behavior), and finally
the small size of Mars. These features make for a very non-linear
interaction which in many regions has little to do with fluid dynamics
but rather plasma kinetics.
In this talk a discussion of these
issues as well as results of kinetic plasma simulations with data
comparisons will be presented. Dr. Brecht will also discuss how the
results from the ongoing MAVEN mission at Mars can be used to test the
presented plasma simulation predictions.
Κατηγορία
Άδεια
- Τυπική άδεια YouTube
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