![]() ![]() Studies supporting both heating scenarios. ![]() Our results explain why there have been recent Suggests that low-frequency heating also plays a significant role. The presence, however, during theĮarly stages, of an enhanced emission measure in the “hot” (3.0–4.5 MK) and “cool” (0.6–0.9 MK) components Increase at low temperatures suggests that high-frequency heating is viable. The significant emission measure at high temperatures that is not correlated with a comparable We find that the active region cores become fainter and We inspect a broad range of temperatures, including for the first time spatiallyĪnd temporally resolved images of Ca xiv and Ca xv lines. We then diagnose the variability of the active region cores at several instances of their lifetime usingĮIS/Hinode spectral capabilities. Of STEREO and Solar Dynamics Observatory spacecraft to track these active regions as they rotate around the Sun We take advantage of the nearly full Sun observations Two active regions in the context of their long-term evolution. We present an investigation of the short-term variability of loops in the core of The relationship between the different loop populations, The presence of both steady and transient loops in active region cores has been reported from soft X-ray andĮxtreme-ultraviolet observations of the solar corona. Received 2012 August 30 accepted 2012 October 15 published 2012 November 20 Warren2Ĭollege of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030, USAĢ Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA IS ACTIVE REGION CORE VARIABILITY AGE DEPENDENT? The Astrophysical Journal, 761:21 (10pp), 2012 December 10 ![]()
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