On solar radiation-driven surface transport of sodium atoms at mercury

研究成果: 雜誌貢獻期刊論文同行評審

31 引文 斯高帕斯(Scopus)

摘要

The ballistic motion of the exospheric sodium atoms on the surface of Mercury is modeled, taking into account the solar radiation pressure acceleration and partial surface thermal accommodation. The Monte Carlo simulations show that there should be a significant degree of limb brightening as well as brightness enhancement over the poles. To maintain the observed sodium optical emission, a surface production rate on the order of 5-9 × 1024 atoms s-1 is needed. It is also found that, under the present set of assumptions, a reasonable agreement can be reached between theoretical results and ground-based measurements for the dependence of the disk-averaged abundance of the sodium atoms on the solar radiation pressure acceleration. If the low-latitude portion of the planetary surface is shielded from the magnetospheric convective electric field, the effective loss rate of the sodium atoms via photoionization and magnetospheric pickup may be reduced to about 2 × 1024 atoms s-1, with the polar regions acting as the main area of ion outflows.

原文???core.languages.en_GB???
頁(從 - 到)675-681
頁數7
期刊Astrophysical Journal
356
發行號2
DOIs
出版狀態已出版 - 20 6月 1990

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