Other
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21630001m&link_type=abstract
American Astronomical Society, AAS Meeting #216, #300.01; Bulletin of the American Astronomical Society, Vol. 41, p.814
Other
Scientific paper
Despite much progress toward understanding the dynamics of the corona, the physical properties of coronal loops are not yet fully understood. Recent investigations and observations from different instruments have yielded contradictory results about the true physical properties of coronal loops, specifically as to whether the observed loops are isothermal structures or the convolution of several multi-thermal strands. In this talk, we introduce a new technique to determine if an observed loop is isothermal or multi-thermal. We determine the evolution of ten selected loops in multiple filter images from the Transition Region and Coronal Explorer (TRACE). Our new technique calculates the delay, calculates a cooling time, and determines if that cooling time is consistent with the observed lifetime. If the observational lifetime of the loop agrees with the calculated lifetime, then we can conclude that the loop is a single "monolithic” structure that heats and cools as a homogeneous unit, with isothermal temperature over the cross-section. If not, the loop must be a bundle of multiple multi-thermal strands, all being heated and cooling independently. In the second part of the talk, we utilize the concept of nanoflare storms to understand the reason behind the extended lifetimes. By simulating the observed light curves of the loops using EBTEL (Enthalpy-Based Thermal Evolution of Loops), we find that the longer observed lifetimes can be reproduced by using a set of small-scale impulsively heated strands.
Aschwanden Markus J.
Klimchuk James A.
Mulu Fana
Warren Harry P.
Winebarger Amy R.
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