SPECTROSCOPIC ANATOMY OF A METEOR TRAIL CROSS SECTION WITH THE EUROPEAN SOUTHERN OBSERVATORY VERY LARGE TELESCOPE
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dc.contributor.author | Jenniskens P. | |
dc.contributor.author | Jehin E. | |
dc.contributor.author | Cabanac R.A. | |
dc.contributor.author | Laux C.O. | |
dc.contributor.author | Boyd I.D. | |
dc.date.accessioned | 2022-10-07T08:40:43Z | |
dc.date.available | 2022-10-07T08:40:43Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=14023567 | |
dc.identifier.citation | Meteoritics and Planetary Science, 2004, 39, 4, 609-616 | |
dc.identifier.issn | 1086-9379 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/38913 | |
dc.description.abstract | A meteor spectrum was recorded serendipitously at the European Southern Obrervatory (ESO) Very Large Telescope (VLT) during a long exposure in long‐slit spectroscopic mode with FORS1. The −8 magnitude fireball crossed the narrow 1Î × 7î slit during the observation of a high z supernova in normal service mode operation on May 12, 2002. The spectrum covered the range of 637–1050 nm, where the meteor's air plasma emissions from N2, N, and O dominate. Carbon atom emission was not detected in the relatively unexplored wavelength range above 900 nm, but the observed upper limit was only 3 sigma less than expected from the dissociation of atmospheric CO2. The meteor trail was resolved along the slit, and the emission had a Gaussian distribution with a dimension of FWHM = 7.0 (±0.4) * sin(α) * H (km)/90 m, where α is the unknown angle between the orientation of the meteor path and slit and H the assumed altitude of the meteor in km. To our knowledge, this is the first observation of a spatially resolved spectrum across a meteor trail. Unlike model predictions, the plasma excitation temperature varied only from about 4,300 to 4,365 K across the trail, based on the ratio of atomic and molecular nitrogen emissions. Unfortunately, we conclude that this was because the meteor at 100 km altitude was out of focus. | |
dc.title | SPECTROSCOPIC ANATOMY OF A METEOR TRAIL CROSS SECTION WITH THE EUROPEAN SOUTHERN OBSERVATORY VERY LARGE TELESCOPE | |
dc.type | Статья |
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