Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p61a0343j&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P61A-0343
Physics
2129 Interplanetary Dust, 5421 Interactions With Particles And Fields, 6007 Atmospheres: Structure And Dynamics, 6015 Dust, 6245 Meteors
Scientific paper
When comets are exposed to solar radiation, they emit dust particles that rapidly disperse in the interplanetary medium. There, they experience weathering due to heating and cooling cycles, solar wind implantation, and collisions. The result is to facilitate breakup of the grains, make the remaining units more (or less) cohesive, and change the volatile element contribution (sodium containing minerals and organics). The breakup of grains is evident in the presence of meteor clusters during meteor showers. Spectacular examples have recently been detected during Leonid storms. These are particularly interesting for understanding space weathering of solid surfaces, because the epoch of ejection of the grains and the duration of exposure to the interplanetary medium is known. All are from very recent returns of the parent comet to perihelion. In addition, the sputtering of meteoroids by air molecules during entry in the Earth's atmosphere may be a usefull analog in understanding the source of the sodium atmosphere of the Moon and Mercury. In certain conditions, an early release of sodium is observed. Results from NASA's Leonid Multi-Instrument Aircraft Campaign (Leonid MAC) and ground based Leonid storm observations will be discussed in this context. First results from the recent November 2002 Leonid MAC mission will be shown.
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