Many Sun coronal loops last for days or weeks, but most change quite rapidly.

NASA's Solar Dynamics Observatory image in extreme ultraviolet light shows an active region of the sun's coronal loops taken over about a two-day period, from February 8 - 10, 2014 and released on February 18, 2014. Coronal loops are found around sunspots and in active regions. These structures are associated with the closed magnetic field lines that connect magnetic regions on the solar surface. Many coronal loops last for days or weeks, but most change quite rapidly. REUTERS/Solar Dynamics Observatory/NASA/Handout via Reuters (OUTER SPACE - Tags: ENVIRONMENT SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY) ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS