Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa42a..09m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA42A-09
Other
0300 Atmospheric Composition And Structure, 0305 Aerosols And Particles (0345, 4801), 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 2129 Interplanetary Dust, 2419 Ion Chemistry And Composition (0335)
Scientific paper
Interplanetary dust particles (IDPs) continuously impact all the planets and their satellites in the solar system. In all planetary atmospheres IDPs leave their imprint as aerosols or smoke particles that are left behind when the IDPs do not ablate completely or when the ablated vapors recondense. In addition, in all atmospheres they produce ionization layers comprised of metallic ions, predominantly Mg+ and Fe+. On Earth the metal ions are frequently measured to be the dominant positively charged species in low-latitude ionospheric layers. Theoretical models provide evidence that such layers exist at Venus, Mars, Jupiter, Saturn, Neptune and Saturn's moon Titan. Even the sparse atmosphere of Triton may be lit up by meteors. Spacecraft radio occultation measurements reveal low altitude, narrow ionosphere layers at each of the giant planets. These narrow features appear to be consistent with the presence of metallic ions that have been compressed by electrodynamic processes as on Earth. Observations at Mars and Venus do not show clear evidence of such layers. The IDPs also deposit nonmetal neutral species in the ablation process. For the inner planets these species blend unnoticed into the atmosphere, but for the outer planets they can lead to persistent amounts of water vapor and carbon dioxide. Although many measurements are available for the Earth, measurements of the IDP distributions and their atmospheric signatures at other planets are in their initial stages at the present time. Modeling efforts are still qualitative as the chemical reaction rates for many of the ablated gases are not established. Most of our knowledge of long lasting IDP atmospheric effects is derived from what we know about Earth, for which our understanding is still far from complete. This component of all atmospheres must be treated as a key factor in all planetary atmospheric aeronomy systems.
Grebowsky Joseph M.
Moses Julianne I.
Pesnell William Dean
Weisman Andrew L.
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