{"id":30499,"date":"2021-04-02T09:50:00","date_gmt":"2021-04-02T07:50:00","guid":{"rendered":"https:\/\/karmaka.de\/?p=30499"},"modified":"2022-04-20T09:53:45","modified_gmt":"2022-04-20T07:53:45","slug":"luminous-efficiency-based-on-fripon-meteors-and-limitations-of-ablation-models","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=30499","title":{"rendered":"Luminous efficiency based on FRIPON meteors and limitations of ablation models<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>E. Drolshagen, T. Ott, D. Koschny, G. Drolshagen, J. Vaubaillon, F. Colas, B. Zanda, S. Bouley, S. Jeanne, A. Malgoyre, M. Birlan, P. Vernazza, D. Gardiol, D. A. Nedelcu, J. Rowe, M. Forcier, J. M. Trigo-Rodriguez, E. Pe\u00f1a-Asensio, H. Lamy, L. Ferri\u00e8re, D. Barghini, A. Carbognani, M. Di Martino, S. Rasetti, G. B. Valsecchi, C. A. Volpicelli, M. Di Carlo, C. Knapic, G. Pratesi, W. Riva, G. M. Stirpe, S. Zorba, O. Hernandez, A. Grandchamps, E. Jehin, M. Jobin, A. King, A. Sanchez-Lavega, A. Toni, A. Rimola and B. Poppe<\/p>\n\n\n\n<p>A&amp;A 650, A159 (2021)<br>Received 22 December 2020 \/ Accepted 1 April 2021<\/p>\n\n\n\n<p><a href=\"https:\/\/www.aanda.org\/articles\/aa\/pdf\/2021\/06\/aa40204-20.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Context. In meteor physics, the luminous efficiency \u03c4 is used to convert the meteor\u2019s magnitude to the corresponding meteoroid\u2019s mass. However, a lack of sufficiently accurate verification methods or adequate laboratory tests mean that discussions around this parameter are a subject of controversy.<br>Aims. In this work, we aim to use meteor data obtained by the Fireball Recovery and InterPlanetary Observation to calculate the luminous efficiencies of the recorded meteors. We also show the limitations of the methods presented herein.<br>Methods. Deceleration-based formulas were used to calculate the masses of the pre-atmospheric meteoroids. These can in turn be compared to the meteor brightnesses to assess the luminous efficiencies of the recorded objects. Fragmentation of the meteoroids is not considered within this model. Good measurements of the meteor deceleration are required.<br>Results. We find \u03c4-values, as well as the shape change coefficients, of 294 meteors and fireballs with determined masses in the range of 10\u22126\u2013100 kg. The derived \u03c4-values have a median of \u03c4median = 2.17%. Most of them are of the order of 0.1\u201310%. We present how our values are obtained, compare them with data reported in the literature, and discuss several methods. A dependence of \u03c4 on the pre-atmospheric velocity of the meteor, ve, is noticeable with a relation of \u03c4 = 0.0023 \u00b7 v2.3e . Furthermore, a dependence of \u03c4 on the initial meteoroid mass, Me, is found with negative linear behaviour in log\u2013log space: \u03c4 = 0.48 \u00b7 M\u22120.47e .<br>Conclusions. The higher luminous efficiency of fast meteors could be explained by the higher amount of energy released. Fast meteoroids produce additional emission lines that radiate more efficiently in specific wavelengths due to the appearance of the so-called second component of higher temperature. Furthermore, the negative dependence of \u03c4 on Me implies that the radiation of smaller meteoroids is more efficient. The results of this study also show the limitations of the ablation-based model for the determination of the luminous efficiency.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>E. Drolshagen, T. Ott, D. Koschny, G. Drolshagen, J. Vaubaillon, F. Colas, B. Zanda, S. Bouley, S. Jeanne, A. Malgoyre, M. Birlan, P. Vernazza, D. Gardiol, D. A. Nedelcu, J. Rowe, M. Forcier, J. M&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96,97],"tags":[3517,98,141,3711],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/30499"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=30499"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/30499\/revisions"}],"predecessor-version":[{"id":30500,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/30499\/revisions\/30500"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=30499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=30499"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=30499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}