Low dispersion spectra of lunar impact flashes in 2018 Geminids
| Autor: | Ryota Fuse, Hsin-Chang Chi, Fumi Yoshida, Satoshi Tanaka, Taichi Kawamura, Jim Lee, Masahisa Yanagisawa, Ryuhei Yamada, Yuki Uchida, Keisuke Onodera, Zhong-Yi Lin, Seiya Kurihara, Shinsuke Abe |
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| Přispěvatelé: | The University of Electro-Communications [Tokyo], Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency [Sagamihara] (JAXA), Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Meteor (satellite)
Materials science 010504 meteorology & atmospheric sciences Meteoroid Astronomy and Astrophysics Lunar impact flash Astrophysics Visible and near-infrared spectrum 01 natural sciences Spectral line Plume Wavelength Impact crater 13. Climate action Space and Planetary Science [SDU]Sciences of the Universe [physics] 0103 physical sciences Geminids Black-body radiation Ejecta 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Planetary and Space Science Planetary and Space Science, Elsevier, 2021, 195, pp.105131. ⟨10.1016/j.pss.2020.105131⟩ |
| ISSN: | 0032-0633 |
| Popis: | International audience; Lunar impact flashes have been observed at collisions of meteoroids against the non-sunlit lunar surface at speeds exceeding 10 km s À1. We detected 13 flash candidates between 6.2 and 9.9 in R-magnitude on December 15, 2018 during the Geminids meteor activity. Two or three observatories confirmed eleven of them. We obtained their spectra in the wavelength range between 400 and 870 nm. They are continuous and red, with best-fitted single blackbody spectra indicating the temperatures of about 2000-4000 K. The temperatures for a few successive movie frames at 16 ms or 25 ms intervals decrease with time. Incandescent ejecta, consisting of melt droplets or dust, and the radiant floor of an impact crater could be the source of these flashes, except for the initial stages. At the beginning of some flashes, we found an excess of fluxes at short wavelengths of less than about 600 nm. The composites of two blackbody spectra may fit the spectra better where their temperatures are about 2000 K and 6000 K. The contribution of a high-temperature vapor plume, generated at the very beginnings of the impact phenomena, could be important. |
| Databáze: | OpenAIRE |
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