{"id":12020,"date":"2017-03-10T22:01:06","date_gmt":"2017-03-10T21:01:06","guid":{"rendered":"http:\/\/karmaka.de\/?p=12020"},"modified":"2017-03-10T22:03:07","modified_gmt":"2017-03-10T21:03:07","slug":"numerical-prediction-of-meteoric-infrasound-signatures","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=12020","title":{"rendered":"Numerical prediction of meteoric infrasound signatures<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"<p>Marian Nemec, Michael J. Aftosmis, Peter G. Brown<\/p>\n<p>Planetary and Space Science<br \/>\nIn Press, Accepted Manuscript, Available online 10 March 2017<\/p>\n<p><a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S0032063316304469?np=y&#038;npKey=1f0b48d32e7c14d753192b5784e7cd03dd057db0f72706ffc384a57743092f58\" target=\"_blank\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><\/p>\n<p>&#8220;We present a thorough validation of a computational approach to predict infrasonic signatures of centimeter-sized meteoroids. This is the first direct comparison of computational results with well-calibrated observations that include trajectories, optical masses and ground pressure signatures. We assume that the energy deposition along the meteor trail is dominated by atmospheric drag and simulate a steady, inviscid flow of air in thermochemical equilibrium to compute a near-body pressure signature of the meteoroid. This signature is then propagated through a stratified and windy atmosphere to the ground using a methodology from aircraft sonic-boom analysis. The results show that when the source of the signature is the cylindrical Mach-cone, the simulations closely match the observations. The prediction of the shock rise-time, the zero-peak amplitude of the waveform and the duration of the positive pressure phase are consistently within 10% of the measurements. Uncertainty in primarily the shape of the meteoroid results in a poorer prediction of the trailing part of the waveform. Overall, our results independently verify energy deposition estimates deduced from optical observations.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Marian Nemec, Michael J. Aftosmis, Peter G. Brown Planetary and Space Science In Press, Accepted Manuscript, Available online 10 March 2017 LINK (OPEN ACCESS) &#8220;We present a thorough validation of a computational approach to predict&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[3716,226,3715,141],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/12020"}],"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=12020"}],"version-history":[{"count":3,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/12020\/revisions"}],"predecessor-version":[{"id":12023,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/12020\/revisions\/12023"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}