Active Region Loops: Not So Strange After All

Details Active Region Loops: Not So Strange After All Active Region Loops: Not So Strange After All

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0122d&link_type=abstract

American Astronomical Society, SPD meeting #37, #1.22; Bulletin of the American Astronomical Society, Vol. 38, p.219

Astronomy and Astrophysics

Astronomy

Scientific paper

Active region loops are enigmatic. Despite a great deal of work many pecularities remain hard to explain, such as their nonthermal apparent scale height, apparent uniform thickness, extreme thermal inhomogeneity, and rapid evolution on timescales shorter than the apparent cooling time. All of these effects can be explained via the assumption that bright threads in active regions do in fact follow the morphology of the force-free field (i.e. do not have uniform thickness) but are not fully resolved by TRACE. I find that nearly-hydrostatic, force-free active region loops with isolated localized heating are the simplest physical scenario for active region loop formation. In this scenario, the threads are >10x more dense than the surrounding media, with a radiative cooling time as short as 30 seconds; the anomalous apparent scale heights are caused by a geometric effect on unresolved (or poorly resolved) spatial scales. In addition, the picture provides a ready explanation both for threads' rapid appearance and disappearance in TRACE movies and also for the surprising existence of transient, smooth, threaded, cool active region loops in TRACE FUV images. Whether this scenario proves true, it serves to demonstrate an important geometrical effect that, if ignored, can cause large problems for interpretation of EUV and FUV active region images.

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