Место издания:The Lunar and Planetary Institute, USRA Western Ontario, Canada
Аннотация:Here we can try to outline possible application of laser plasma to overcome challenges in the interpretation of meteor spectra. The first “direct” application of laser plasma is the studying of emission of iron oxides (FeO/FeO2) observed during meteor events. Since theoretical simulation of the FeO spectra is not feasible the spectra of laser plasma was used to mimic the FeO pseudo-continuum spectrum. The laboratory spectra of the orange bands are found to be closest to their astronomical counterparts registered during meteor events than previously used chemiluminescence spectra. The next interesting task to register spectra of FeO and CaO bands in laser plasma and vary conditions to make spectra profiles as close as possible to the ones observed during the Benešov bolide event to attempt reconstruction of a behavior of meteor wake. We showed that the similar profile is formed under 7–10 times higher pressure than the one at the corresponding altitude of bolide event. Furthermore, study of the relative intensities of molecular bands at different pressures allows us to claim that the intensity of the FeO band is almost independent of pressure, while the intensity of the CaO band has strong dependency. This lead us to suggestion that the formation of CaO in plasma occurred primarily using oxygen from atmosphere. Therefore, abundance of CaO should have a strong dependency on the pressure of the surrounding media. Thus, we can conclude that laser plasma is versatile and promising plasma source for interpreting emission of meteor events. This work was supported by the RSF (grant 18-13-00269-П).
