Lunar dust - Click to edit Master subtitle style Nima A Mohajer An Introduction to Lunar dust and atmosphere Aerosol mechanics tutorial March 2010

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Unformatted text preview: Click to edit Master subtitle style Nima A. Mohajer An Introduction to Lunar dust and atmosphere Aerosol mechanics tutorial March 2010 Outline ҉ Importance ҉ Goals ҉ Lunar atmosphere ҉ Structure of lunar air ҉ Ionizing radiations ҉ Lunar regolith ҉ Lunar dust ҉ Lunar dust dynamics ҉ Lunar dust levitation 3 ҉ Lack of knowledge ҉ Lunar dust levitation and its deleterious effects ҉ Acquaintance with particle motion in solar systems Importance 4 Goals ҉ Getting a general view about the moon atmosphere ҉ The importance of lunar dust studies for the environmental and aerospace engineers ҉ Learning about lunar dust and some specific characteristics of them ҉ Acquaintance with lunar dust motion and their differences with terrestrial dust Outline ҉ Importance ҉ Goals ҉ Lunar atmosphere ҉ Structure of lunar air ҉ Ionizing radiations ҉ Lunar regolith ҉ Lunar dust ҉ Lunar dust dynamics ҉ Lunar dust levitation 6 Lunar atmosphere Does moon have any atmosphere or not? To be or not to be? Gases + Fine dust Main source of gases is volcanic activities Main source of fine dust is impaction of meteorites ҉ General lunar atmosphere characteristics In general, lunar atmosphere is: 1) Tenuous, thin and can be neglected in some lunar studies Outline ҉ Importance ҉ Goals ҉ Lunar atmosphere ҉ Structure of lunar air ҉ Ionizing radiations ҉ Lunar regolith ҉ Lunar dust ҉ Lunar dust dynamics ҉ Lunar dust levitation 8 Structure of lunar atmosphere Where are the gases come from to the Abundances (molecules/cm3) ) Scale heights Daytime Nighttime Daytime Nighttime Ne ~ 4 x 103 to 104 105 100 km 25 km He ~ 8 x 102 – 4.7 x 103 4 to 7 x 104 511 km 128 km H2 ~ 2.5 – 9.9 x 103 104 to 1.5 x 105 1022 km 256 km Ar ~ 2 x 103 To < 102 55 km No data CH4 ~ 1.2 x 103 No data No data No data CO2 ~ 103 No data No data No data NH3 ~ 4 x 102 No data No data No data H2O ~ 0.5 No data No data No data 9 Structure of lunar atmosphere ҉ Main gases in the lunar space are: 1) Neon (Ne) 2) Hydrogen (H2) 3) Helium (He) 4) Argon (Ar) CO2 & SO2 90% Solar winds 10% Radiogenic Main from volcanic eruptions Some SO2 from meteorite impactions Decay of radioactive isotope of Potassium ҉ Reliability and uncertainty: Solar winds Thermally removal of H2 and He In addition to ionizing the Ar 10 Structure of lunar atmosphere ҉ Troposphere and stratosphere? Perpetual circulation of frozen gases Other than O3, others do not absorb heat ҉ Lunar atmosphere prospective Removal rate is higher than formation rate Thickener atmosphere in the past, diluter in the future ҉ Atmospheric gases around levitated dust 90 ~ 120 km above the lunar surface Na & K Thus, formed cloud in horizon glow cannot be gas mixture Outline...
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This note was uploaded on 09/11/2011 for the course ENV 6130 taught by Professor Wu during the Spring '08 term at University of Florida.

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Lunar dust - Click to edit Master subtitle style Nima A Mohajer An Introduction to Lunar dust and atmosphere Aerosol mechanics tutorial March 2010

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