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| Titel |
Secondary electron emission from the surface covered by a dust layer |
| VerfasserIn |
Ivana Richterova, Jakub Vaverka, Jiri Pavlu, Zdenek Nemecek, Jana Safrankova |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110206
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| Publikation (Nr.) |
 EGU/EGU2015-10184.pdf |
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| Zusammenfassung |
| Bodies immersed in the plasma are charged to the floating potential that is determined by a
balance of the currents onto/from the surface. The collection of charged particles and the
photoemission current dominate but if the temperature of the electron component of the
ambient plasma is high enough (10ÂeV or more) the secondary electron emission current
should be considered. For an explanation of observed surface potentials of the bodies covered
with a dust layer like the Moon, a depression of the secondary electron emission yield by a
factor of 2 or 3 with respect to the smooth planar surface is expected. However, our previous
calculations of an influence of the surface roughness on the secondary electron emission from
dust grains have shown that these effects do not lead to required yield reduction. The present
paper is devoted to a search for dust grain configurations on a planar surface that can provide
the yield reduction consistent with observed surface potentials. The results are compared with
the calculations of the yield from porous (lava type) surfaces. This approach can be also
applied to other processes as the photoemission or ion induced electron emission. |
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