Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa41a..06d&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA41A-06
Physics
0644 Numerical Methods, 0654 Plasmas, 6205 Asteroids And Meteoroids, 6245 Meteors
Scientific paper
In the present work we focus on the role of thermionic emission in the charging of a meteoroid. It has been shown [1] that the higher mobility of the plasma electrons (that would lead to negatively charged meteoroids) can be overcome by electron emission, thus reversing the meteoroid polarity. Moreover, recent work [2] has shown how electron emission can fundamentally affect the shielding potential around the dust. In particular, depending on the physical parameters of the system the shielding potential can develop an attractive potential well. The aim of the present work is two-fold. First, we will present a parametric study in order to understand the conditions for the formation, as well as the stability of the well. Furthermore, simulations will be presented with physical parameters corresponding to the ionosphere, thus extending our study to the case of meteoroids. [1] G. Sorasio, D. A. Mendis, and M. Rosenberg, "The role of thermionic emission in meteor physics," Planet. Space Sci. 49, 1257, 2001. [2] G.L. Delzanno, G. Lapenta, M. Rosenberg, "Attractive Potential among Thermionically Emitting Microparticles", submitted.
Delzanno Gian Luca
Lapenta Giovanni
Rosenberg Marlene
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