{"id":749,"date":"2019-09-19T20:28:20","date_gmt":"2019-09-19T20:28:20","guid":{"rendered":"https:\/\/www.pa.op.dlr.de\/southtrac\/?p=749"},"modified":"2019-09-19T20:29:16","modified_gmt":"2019-09-19T20:29:16","slug":"surfing-on-mountain-waves-up-and-down-above-the-southern-andes","status":"publish","type":"post","link":"https:\/\/www.pa.op.dlr.de\/southtrac\/southtracnews\/2019\/09\/19\/surfing-on-mountain-waves-up-and-down-above-the-southern-andes\/","title":{"rendered":"Surfing on Mountain Waves \u2013 Up and Down above the Southern Andes"},"content":{"rendered":"<p>Yesterday night, HALO completed the fourth research flight dedicated to mountain waves above the Southern Andes. Prevailing moderate westerly to south-westerly winds triggered mountain waves and the flight crew could report \u201cnice\u201d up- and downward movements of the aircraft shortly after take-off along the first cross mountain section.<\/p>\n<p><!--more--><\/p>\n<figure id=\"attachment_750\" aria-describedby=\"caption-attachment-750\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-750\" src=\"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_clouds.png\" alt=\"\" width=\"800\" height=\"450\" srcset=\"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_clouds.png 1280w, https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_clouds-300x169.png 300w, https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_clouds-768x432.png 768w, https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_clouds-1024x576.png 1024w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-750\" class=\"wp-caption-text\">HALO infront of the hangar before take-off and storm clouds in the background. Photo: A. Minikin<\/figcaption><\/figure>\n<p>Large scale gravity waves structures presumably related to exit region of the stratospheric polar night jet were sampled by ALIMA higher up in the stratosphere.<\/p>\n<figure id=\"attachment_752\" aria-describedby=\"caption-attachment-752\" style=\"width: 267px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-752\" src=\"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_alima.jpg\" alt=\"\" width=\"267\" height=\"400\" srcset=\"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_alima.jpg 853w, https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_alima-200x300.jpg 200w, https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_alima-768x1152.jpg 768w, https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_alima-682x1024.jpg 682w\" sizes=\"auto, (max-width: 267px) 100vw, 267px\" \/><figcaption id=\"caption-attachment-752\" class=\"wp-caption-text\">ALIMA illuminates the night-sky over Rio Grande after landing. Photo: A. Minikin<\/figcaption><\/figure>\n<p>Icing problems of the lidar window which were encountered during the previous flight have not been a problem during this flight. Drying the air in the telescope with Nitrogen and warmer outside temperatures fixed the issue during the flight for this time. In-situ trace gas instruments took measurements of polar vortex air at different latitudes.<\/p>\n<figure id=\"attachment_751\" aria-describedby=\"caption-attachment-751\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-751\" src=\"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_hangar_night.png\" alt=\"\" width=\"800\" height=\"367\" srcset=\"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_hangar_night.png 1280w, https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_hangar_night-300x138.png 300w, https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_hangar_night-768x352.png 768w, https:\/\/www.pa.op.dlr.de\/southtrac\/wp-content\/uploads\/sites\/6\/2019\/09\/halo_hangar_night-1024x470.png 1024w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-751\" class=\"wp-caption-text\">HALO returns to RGA in darkness after the 8-hours night flight. Photo: A. Minikin<\/figcaption><\/figure>\n<p>Today is a ground day for aircraft and instrument maintenance. The flight plan for the next gravity wave night flight with take-off planned for Friday at 20 LT was already finalized submitted yesterday. Looking forward to another flight with mountain waves forecasted in the troposphere and stratosphere above the Southern Andes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yesterday night, HALO completed the fourth research flight dedicated to mountain waves above the Southern Andes. Prevailing moderate westerly to south-westerly winds triggered mountain waves and the flight crew could report \u201cnice\u201d up- and downward movements of the aircraft shortly after take-off along the first cross mountain section.<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-749","post","type-post","status-publish","format-standard","hentry","category-southtracnews"],"_links":{"self":[{"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/posts\/749","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/comments?post=749"}],"version-history":[{"count":3,"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/posts\/749\/revisions"}],"predecessor-version":[{"id":755,"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/posts\/749\/revisions\/755"}],"wp:attachment":[{"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/media?parent=749"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/categories?post=749"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pa.op.dlr.de\/southtrac\/wp-json\/wp\/v2\/tags?post=749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}