{"id":10307,"date":"2012-05-09T19:15:51","date_gmt":"2012-05-09T19:15:51","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=10307"},"modified":"2012-06-07T14:15:54","modified_gmt":"2012-06-07T14:15:54","slug":"goes-12-cycle-slips","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/10307","title":{"rendered":"GOES-12 Imager Cycle Slips"},"content":{"rendered":"
\"GOES-12<\/a>

GOES-12 Imager from 1045 UTC 9 May 2012 (click image to play animation of all bands)<\/p><\/div>\n

GOES-M was launched in 2001<\/a> and as GOES-12 served as the operational GOES-East satellite from April 1, 2003 until April 14th, 2010<\/a>, and has been serving recently as GOES-South America, providing Weather Services on that Continent with routine Imager and Sounder data.<\/p>\n

Recently, the GOES-12 Imager has been experiencing ‘cycle<\/a> slips<\/a>‘, which manifest themselves in imagery as lines that are shifted, as shown in the loop above of the 5 Imager channels (Individual channels are here: 0.65 \u00c2\u00b5m<\/a>, 3.9 \u00c2\u00b5m<\/a>, 6.5 \u00c2\u00b5m<\/a>, 10.7 \u00c2\u00b5m<\/a>, 13.3 \u00c2\u00b5m<\/a>). Cycle slips occur as the satellite on-board software loses track of where the image mirror used to view the Earth is in its scan cycle. After the scan system initializes at the start of a scan cycle, the system expects consistent behavior, and no resources are allocated to track which cycle the mirror is in. Only increments are tracked. If the mirror is moving and a hiccup occurs, that anomaly (which is manifest as a shift in the center of the line) continues until the next system initialization.<\/p>\n

The reason for the uptick in the number of Cycle Slips is unknown.<\/p>\n

The images in this blog entry were generated using McIDAS-V<\/a>. <\/p>\n

(Update, 4 June 2012: An Imager Electronics Side Swap is scheduled for June 6, 2012, for GOES-12 (GOES-South America) based on the Manufacturer’s Recommendation as a potential remedy to mitigate the ongoing Cycle Slips. The side switch will be performed at 1615 UTC on 6 June 2012. The duplicate sensors that will now be used have not yet been used during GOES-12’s life. Because new sensors are being used, new look-up tables and calibration coefficients have been computed and are available here<\/a>. Also, see page 29 in this pdf<\/a> for more information on the two detector sets. Here<\/a> is the notification of coming changes.)<\/p>\n","protected":false},"excerpt":{"rendered":"

GOES-M was launched in 2001 and as GOES-12 served as the operational GOES-East satellite from April 1, 2003 until April 14th, 2010, and has been serving recently as GOES-South America, providing Weather Services on that Continent with routine Imager and Sounder data. Recently, the GOES-12 Imager has been experiencing ‘cycle slips‘, which manifest themselves in […]<\/p>\n","protected":false},"author":19,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[50,10,19,51],"tags":[],"class_list":["post-10307","post","type-post","status-publish","format-standard","hentry","category-calibration","category-general-interpretation","category-goes-12","category-mcidas-v"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/10307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=10307"}],"version-history":[{"count":24,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/10307\/revisions"}],"predecessor-version":[{"id":10527,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/10307\/revisions\/10527"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=10307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=10307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=10307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}