On the Lifetime of Hot Coronal Plasmas Arising from Nanoflares

Details On the Lifetime of Hot Coronal Plasmas Arising from Nanoflares On the Lifetime of Hot Coronal Plasmas Arising from Nanoflares

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008soph..252...89w&link_type=abstract

Solar Physics, Volume 252, Issue 1, pp.89-100

Physics

4

Scientific paper

The cooling of plasmas in closed coronal loops by thermal conduction is important when considering their detectability at X-ray and EUV wavelengths. A non-local formalism of thermal conduction originating in laboratory plasmas is used and it is shown that while the effect is unlikely to be important for loops that are in a steady state, it does play a significant role in loops that are impulsively heated ( e.g., by nanoflares). Such loops are “under-dense”, and so hot electrons have a relatively long mean free path. Analytic and numerical models are presented, and it is shown that conduction cooling times are lengthened quite considerably. A comparison of various cooling times with ionisation times is also presented, and it is noted that this conductive physics may enhance the chances of observing hot nanoflare-heated plasma.

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