On the Lifetime of Hot Coronal Plasmas Arising from Nanoflares |
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| Authors: | M J West S J Bradshaw P J Cargill |
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| Institution: | (1) School of Mathematics and Statistics, University of St Andrews, St Andrews, Fife, KY16 9SS, UK;(2) Space and Atmospheric Physics Group, The Blackett Laboratory, Imperial College, London, SW7 2BW, UK |
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| Abstract: | 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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