Školitel: RNDr. Jakub Vaverka, Ph.D.
Konzultant: Doc. RNDr. Jiří Pavlů, Ph.D.
Stav práce: volná
Interaction between the lunar surface and the solar UV radiation and surrounding plasma environment leads to its charging by different processes like photoemission, collection of charged particles, or secondary electron emission (SEE). Around the lunar terminator, a surface potential is highly variable. It can reach positive values at the illuminated side, but a photoemission is reduced for high solar zenith angles. Since the solar wind plasma is declined from the radial direction due to the lunar orbital velocity around the Sun, there is a region influenced by the solar wind in a shadow at the dawn terminator and, by contrast, a similar area at the dusk terminator is shielded from the solar wind impact, but it is further illuminated by solar photons. As a main topic of the thesis, we suppose to perform laboratory experiments in which a single micrometer-sized lunar dust simulant or the surface covered by dust simulant grains will be irradiated by UV photons, affected by the impacts of energetic ions (with different masses) and/or electrons. This experiment will substitute the interplanetary space with heavy elements and will allow us to study of competitions of various charging processes. Moreover, we suppose to compare the results of this experiment with numerical calculations.