2024-09-04T01:16:42.186407Z http://sot.lmsal.com Mr. Sam Freeland Lockheed Martin Solar and Astrophysics Laboratory (LMSAL) http://www.lmsal.com Lockheed Martin ATC, 3251 Hanover St., Palo Alto, CA 94306 null null HINODE SOTSP Arikawa Arikawa Zoe (RCO) 267 AR 12418 for HOP 267 Active Region AR AR 12418 12 20150919_183649 302 335 340 12 67 1750 2 1 1 0 2 21 2032 841 0.9611428571428572 11.168 -396.759 266.597 162.304 2015-09-19T18:36:49.000Z 2015-09-19T19:32:08.000Z 11.168 -396.759 sunspot footpoint plumes Fast map, 280"x164", Q65, 1-side CCD Sunspots often show bright fan loops in the AIA 171 channel, and these are clearly seen in upper transition region lines of EIS where they exhibit downflows of 10-40 km/s. Sunspot plumes are identified as redshifted features seen in transition region lines, and are particularly clearly seen in the IRIS O IV lines, which show velocities of 70-100 km/s. Sunspot plumes are usually narrower than fan loops, but are found in the same locations so they may represent one stage in the evolution of the strands that compose fan loops. This IHOP will take coordinated observations between Hinode and IRIS to investigate the relationship between sunspot plumes and fan loops.