{"id":1419,"date":"2015-01-06T23:22:11","date_gmt":"2015-01-06T21:22:11","guid":{"rendered":"https:\/\/www.planetary-astronomy-and-imaging.com\/?p=1419"},"modified":"2015-01-10T17:23:40","modified_gmt":"2015-01-10T15:23:40","slug":"jupiter-under-the-jet-stream","status":"publish","type":"post","link":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/jupiter-under-the-jet-stream\/","title":{"rendered":"Jupiter under the jet-stream, what&#8217;s the result?"},"content":{"rendered":"<p
style=\"text-align: center;\"><em><strong>Last year I made a summary on the <a
title=\"Five good conditions for astronomical seeing\" href=\"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/five-conditions-good-seeing\/\" target=\"_blank\">best conditions for a good seeing<\/a>. Unfortunately there are as well other conditions that damage it. Here is a &#8220;good&#8221; example on Jupiter: the influence of the jet-stream.<\/strong><\/em><\/p>\n<p
style=\"text-align: center;\"><\/p>\n<h3 style=\"text-align: justify;\"><span
style=\"color: #000080;\"><strong>What is the jetstream?<\/strong><\/span><\/h3>\n<p
style=\"text-align: justify;\"><a
href=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/cartejet_291215.png\"><img
loading=\"lazy\" class=\"alignleft wp-image-1401\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==\" data-lazy-original=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/cartejet_291215.png\" alt=\"cartejet_291215\" width=\"600\" height=\"464\" srcset=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/cartejet_291215.png 850w, https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/cartejet_291215-300x232.png 300w, https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/cartejet_291215-768x594.png 768w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><noscript><img
loading=\"lazy\" class=\"alignleft wp-image-1401\" src=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/cartejet_291215.png\" alt=\"cartejet_291215\" width=\"600\" height=\"464\" srcset=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/cartejet_291215.png 850w, https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/cartejet_291215-300x232.png 300w, https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/cartejet_291215-768x594.png 768w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/noscript><\/a><\/p>\n<p
style=\"text-align: justify;\">The jet-stream is a very narrow, but very fast, stream of wind that runs at high altitude over various Earth latitudes. Of course we find jet-streams on every planet possessing an atmosphere. This wind stream demarcates big air masses of different temperatures, like between poles (cold air) and tropics (warm air).<\/p>\n<p
style=\"text-align: justify;\">The left image is a visualization of the jet-stream thanks to a map from the <a
title=\"How to read the GFS weather forecast for Astronomy\" href=\"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/read-gfs-forecast\/\" target=\"_blank\">Global forecast system (GFS)<\/a> during the night of December 29th, 2014. This was one of my very rare observing windows recently :(.<\/p>\n<p
style=\"text-align: justify;\">Colors stand for wind speed (warmer = stronger, so red, orange or yellow). The stream is circulating between high pressures (A) and low pressures (D).<\/p>\n<h3 style=\"text-align: justify;\"><span
style=\"color: #000080;\"><strong>What&#8217;s its influence on images ?<\/strong><\/span><\/h3>\n<p>The jet-stream generates instability and this is well visible on images. On the map above we easily see that France is located under a strong jet that circulates on the eastern flank of the high pressure. This is a highly unfavorable situation! Here is a short video taken with a red filter that clearly shows the result (movie is compressed so viewing quality is bad).<\/p>\n<p><iframe
frameborder=\"0\" width=\"702\" height=\"702\" src=\"https:\/\/www.dailymotion.com\/embed\/video\/x2e58vk\" allowfullscreen allow=\"autoplay\"><\/iframe><\/p>\n<p>And here is a processed image (from another 2 mn video)<\/p>\n<p><a
href=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/jupR_jetstream.png\"><img
loading=\"lazy\" class=\"aligncenter wp-image-1408 size-full\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==\" data-lazy-original=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/jupR_jetstream.png\" alt=\"jupR_jetstream\" width=\"480\" height=\"400\" srcset=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/jupR_jetstream.png 480w, https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/jupR_jetstream-300x250.png 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><noscript><img
loading=\"lazy\" class=\"aligncenter wp-image-1408 size-full\" src=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/jupR_jetstream.png\" alt=\"jupR_jetstream\" width=\"480\" height=\"400\" srcset=\"https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/jupR_jetstream.png 480w, https:\/\/www.planetary-astronomy-and-imaging.com\/wp-content\/uploads\/2015\/01\/jupR_jetstream-300x250.png 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/noscript><\/a><\/p>\n<p>Bad result ;). Unfortunately, in western France during winter, this situation is often met for the observer, because the jet-stream is generally more intense and circulates at lower latitudes than during summer. The position of the high pressure is preponderant.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Last year I made a summary on the best conditions for a good seeing. Unfortunately there are as well other conditions that damage it. Here is a &#8220;good&#8221; example on Jupiter: the influence of the jet-stream.<\/p>\n","protected":false},"author":1,"featured_media":1408,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[37],"tags":[],"_links":{"self":[{"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/posts\/1419\/"}],"collection":[{"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/posts\/"}],"about":[{"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/types\/post\/"}],"author":[{"embeddable":true,"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/users\/1\/"}],"replies":[{"embeddable":true,"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/comments\/?post=1419"}],"version-history":[{"count":3,"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/posts\/1419\/revisions\/"}],"predecessor-version":[{"id":1422,"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/posts\/1419\/revisions\/1422\/"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/media\/1408\/"}],"wp:attachment":[{"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/media\/?parent=1419"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/categories\/?post=1419"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.planetary-astronomy-and-imaging.com\/en\/wp-json\/wp\/v2\/tags\/?post=1419"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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