Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp52b01k&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP52B-01 INVITED
Other
7509 Corona, 7519 Flares, 7524 Magnetic Fields, 7549 Ultraviolet Emissions, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
After many years of intense study, the heating of the corona remains a largely unsolved problem. A number of ideas have been proposed involving the episodic release of small bursts of energy, termed ``nanoflares" by Parker based on his rough estimate of the energies involved. Adopting this concept, we investigate a model whereby individual coronal loops like those observed by Yohkoh, SOHO, and TRACE are comprised of many thousands of unresolved strands that are heated randomly and independently by nanoflares. The strands cool by thermal conduction and radiation until they are heated again by the next event. We simulate the observation of these model loops by broadband and spectroscopic instruments such as SXT, CDS, SUMER, and EIS. By varying the nanoflare parameters (primarily the mean energy of the events) and comparing with actual observations, we are able to test the model and constrain the parameters. We find that many real loops are compatible with the model, especially those hotter than 2 MK, but that many others are not. These latter loops are also incompatible with steady heating, and we suggest that they contain coronal material that is injected into the loop by a mechanism not directly related to coronal heating (e.g., not chromospheric evaporation).
Cargill Peter J.
Klimchuk James A.
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