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Dear Les & collegues,
> A recent proposal to explain the stable presence of liquid water on
ancient Mars is >the presence of clouds comprised of solid carbon dioxide
crystals that are good >infra-red reflectors and so lead to suitable
temperatures at the surface.
>
> What are the likely crystal forms of CO2? Have any calculations of halo
>phenomena been made for atmospheres of such clouds (or other crystals
than
>those of water ice for that mattter)?
As an answer to the latter interesting question: The following literature
has appeared on "extra-terrestrial" halos:
- O´Leary B.T. / Astrophys. J. / "The presence of ice in the Venus
atmosphere as
inferred from a halo effect." Vol. 146 (1966), pp. 754-766.
- Können G.P. and Tinbergen J. / Gemini/ "Venus, meteorology and the
Jacobus
Kapteyn telescope" Vol. 22 (1988) December, pp. 12-13.
- O´Leary B.T. / Icarus / "Venus halo: polarimetric evidence for ice in
the Venus clouds." Vol 13 (1970), pp. 292-298.
- Veverka J. / Icarus / "A polarimetric search for a Venus halo during
the
1969 inferior conjunction" Vol. 14 (1971), pp. 282-283.
- Können et al. / Icarus / "Polarimetric search for ice crystals in the
upper atmosphere of Venus" Vol. 102 (1993), pp. 62-75.
- Weinheimer A.J. and Knight C.A. / J. Atmos. Sci / "Scheiner´s halo:
cubic ice or polycrystalline hexagonal ice." Vol. 44 (1987), pp.
3304-3308.
- Whalley E.G. and Laurin G.E. / J. Opt. Soc. Am. A. / "Refraction halos
in the
solar system: I. Halos from cubic ice crystals that may occur in
atmospheres in
the solar system." Vol. 12 (1984), pp. 1166-1170.
- Hansen J.E. and Travis L.D. / Space Sci. Rev. / "Light Scattering in
Planetary atmospheres." Vol. 16 (1974), pp. 527-610.
This was a result of 1/2 hour search through my files. If anybody knows
any
other articles dealing with halos in the solar system (or outside
Earth...)
then please share your literature gem in meteoptics!
I did have a few papers by Soviet cosmonauts about halos in Earth´s clouds
as seen from space station and a lot of others about hypothetical halos in
polar stratospheric clouds / noctilucent clouds, but I skipped these as
stuff belonging to Earth.
Regards, Marko
PS. Special halo hunt wishes to South Pole if Walt has rerouted his
e-mails
to
Scott-Amundsen Station.
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