HR: 16:00h
AN: SP14A-03    [Abstracts]
TI: Highly Efficient Modeling of Dynamic Coronal Loops
AU: * Klimchuk, J A
EM: klimchuk@nrl.navy.mil
AF: Naval Research Lab, Code 7675JAK 4555 Overlook Ave., SW, Washington, DC 20375 United States
AU: Patsourakos, S
EM: spiros.patsourakos@nrl.navy.mil
AF: Naval Research Lab, Code 7675JAK 4555 Overlook Ave., SW, Washington, DC 20375 United States
AU: Cargill, P J
EM: p.cargill@ic.ac.uk
AF: Imperial College, The Blackett Laboratory, London, SW7 2BZ United Kingdom
AB: It now seems clear that many coronal loops, especially those observed by TRACE and EIT, are inherently dynamic and composed of large numbers of impulsively-heated strands. Modeling these loops in full detail is extremely challenging, and modeling entire active regions or the whole Sun is completely out of the question unless approximate techniques are used. We have developed a simplified set of equations that is remarkably accurate at describing the evolution of the thermodynamic variables (T, P, n, v) averaged along the magnetic field of an individual strand. The equations can be solved ten thousand times more quickly than the full 1D hydro equations. This "0D" model relaxes two key assumptions of Cargill's (1994) nanoflare model: (1) the heating can have any time-dependent profile and need not be instantaneous; and (2) thermal conduction cooling and radiation cooling occur together at all times, in varying proportions. We here describe the essential features of the model and show examples of how well it works.
DE: 7509 Corona
DE: 7519 Flares
DE: 7549 Ultraviolet emissions
DE: 7554 X rays, gamma rays, and neutrinos
DE: 7594 Instruments and techniques
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly