Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5137c&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5137
Physics
Scientific paper
The Mercury's exosphere is more dependent on the micrometeoroid impacts than the lunar exosphere and we have applied an order-to-magnitude calculation on the physical conditions of the sodium atoms during these events. This calculation shows the different ionization degree of sodium atoms depending on the meteoroid impact velocity and the related emission enhancements we may have observing the exosphere. We have applied the same calculation to the visible and UV doublets showing the large difference, a factor 5, between the two emission intensities only taking into account the same micrometeoroids contribution. Furthermore we provide a rough estimate for the impact magnitude in sodium light if we observe the night side of the Mercury's surface from the orbit of the ESA mission BepiColombo. Assuming a specific energy distribution of the emitted neutrals, we simulate the characteristics of the low-energy neutral atom fluxes as observable by the SERENA/ELENA instrument proposed on board the ESA BepiColombo Planetary Orbiter.
Capria Maria Teresa
Carbognani Alberto
Cremonese Gabriele
Mangano Valeria
Milillo Anna
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