{"id":50588,"date":"2023-02-20T16:16:31","date_gmt":"2023-02-20T16:16:31","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=50588"},"modified":"2023-02-21T15:09:43","modified_gmt":"2023-02-21T15:09:43","slug":"extensive-sar-imagery-over-freddy","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/50588","title":{"rendered":"Extensive SAR imagery over Freddy"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/SAR_RCM1-RCM2-RCM3-RADARSAT2-S1A_8February_to_20February2023_step-1.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1474\" height=\"537\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/SAR_RCM1-RCM2-RCM3-RADARSAT2-S1A_8February_to_20February2023_step-1.gif\" alt=\"\" class=\"wp-image-50600\"\/><\/a><figcaption class=\"wp-element-caption\">SAR Wind Retrievals over Cyclone Freddy, 8-20 February 2023 (Click to enlarge).  Data from RCM1, RCM2, RCM3, RADARSAT-2 and Sentinel 1A.<\/figcaption><\/figure>\n\n\n\n<p>SAR data collection over Cyclone Freddy in the Indian Ocean has led to a remarkable collection of imagery.  To date, more than twenty eye overpasses have occurred from RADARSAT-2 (3 overpasses), Sentinel 1A (1 overpass) and the three satellites of the RADARSAT Constellation Mission (<strong>17<\/strong>(!) overpasses).  The animation above shows images tracking the system as it moves across the Indian Ocean towards a projected landfall in Madagascar.  Eye-centered imagery, below, shows the organization and strengthening of the system.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/RCM1_RCM2_RCM3_RADARSAT2_S1A_SAR_FreddyEye_08_20February2023_step.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1142\" height=\"831\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/RCM1_RCM2_RCM3_RADARSAT2_S1A_SAR_FreddyEye_08_20February2023_step.gif\" alt=\"\" class=\"wp-image-50597\"\/><\/a><figcaption class=\"wp-element-caption\">SAR Imagery over the eye of Cyclone Freddy, 8 &#8211; 20 February 2023;  SAR data from RCM1, RCM2, RCM3, RADARSAT-2 and Sentinel 1A (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p>Because 5 satellites are involved, occasionally imagery that is very close in time is acquired.  For example, RCM-3 and RADARSAT-2 both sampled the between 2236 and 2240 UTC on 11 February 2023;  RCM-1 and RADARSAT-2 both sampled the eye near 0000 UTC on 16 February (Freddy was near its peak intensity at that time, as noted in <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/50517\">this blog post<\/a>);   RCM-1 and Sentinel-1A both sampled the eye near 0020 UTC on 17 February 2023.  Three toggles showing these comparisons are below.  Note that winds at the edge of a scan are likely weaker than they actually are.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/RCM3_RADARSAT2-20230211_2240UTCtoggle.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1142\" height=\"831\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/RCM3_RADARSAT2-20230211_2240UTCtoggle.gif\" alt=\"\" class=\"wp-image-50601\"\/><\/a><figcaption class=\"wp-element-caption\">RCM-3 and RADARSAT-2 SAR imagery over Cyclone Freddy, ca. 2240 UTC on 11 February 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/RCM1_RADARSAT2-20230216_0000UTCtoggle.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1142\" height=\"831\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/RCM1_RADARSAT2-20230216_0000UTCtoggle.gif\" alt=\"\" class=\"wp-image-50602\"\/><\/a><figcaption class=\"wp-element-caption\">RCM-1 and RADARSAT-2 SAR Winds over Cyclone Freddy, ca. 0000 UTC on 16 February 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/S1A_RCM1-20230217_0020UTCtoggle.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1142\" height=\"831\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/02\/S1A_RCM1-20230217_0020UTCtoggle.gif\" alt=\"\" class=\"wp-image-50603\"\/><\/a><figcaption class=\"wp-element-caption\">Sentinel 1-A and RCM-1 SAR imagery over Cyclone Freddy, ca 0020 UTC on 17 February 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p>SAR Winds and analyses for Cyclone are Freddy are also available <a href=\"https:\/\/www.star.nesdis.noaa.gov\/socd\/mecb\/sar\/AKDEMO_products\/APL_winds\/tropical\/index.html?year=2023&amp;storm=SH112023_FREDDY\">here<\/a>.  For more information on Freddy, refer to the <a href=\"https:\/\/www.metoc.navy.mil\/jtwc\/jtwc.html\">JTWC webpages<\/a>, or the <a href=\"http:\/\/www.meteo.fr\/temps\/domtom\/La_Reunion\/webcmrs9.0\/anglais\/index.html\">RSMC in La Reunion<\/a> (<a href=\"https:\/\/www.nhc.noaa.gov\/images\/wmo_tcp.png\">map of all RSMCs is here<\/a>), or the <a href=\"https:\/\/tropic.ssec.wisc.edu\">SSEC\/CIMSS Tropical Weather Website<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SAR data collection over Cyclone Freddy in the Indian Ocean has led to a remarkable collection of imagery. To date, more than twenty eye overpasses have occurred from RADARSAT-2 (3 overpasses), Sentinel 1A (1 overpass) and the three satellites of the RADARSAT Constellation Mission (17(!) overpasses). The animation above shows images tracking the system as [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":50602,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[104,25,2],"tags":[],"class_list":["post-50588","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sar","category-satellite-winds","category-tropical-cyclones"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/50588","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=50588"}],"version-history":[{"count":8,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/50588\/revisions"}],"predecessor-version":[{"id":50639,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/50588\/revisions\/50639"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/50602"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=50588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=50588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=50588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}