Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-20
Astronomy and Astrophysics
Astrophysics
13 pages, 18 figures, accepted for publication by A&A
Scientific paper
10.1051/0004-6361:20065152
Nanoflares have been proposed as the main source of heating of the solar corona. However, detecting them directly has so far proved elusive, and extrapolating to them from the properties of larger brightenings gives unreliable estimates of the power-law exponent $\alpha$ characterising their distribution. Here we take the approach of statistically modelling light curves representative of the quiet Sun as seen in EUV radiation. The basic assumption is that all quiet-Sun EUV emission is due to micro- and nanoflares, whose radiative energies display a power-law distribution. Radiance values in the quiet Sun follow a lognormal distribution. This is irrespective of whether the distribution is made over a spatial scan or over a time series. We show that these distributions can be reproduced by our simple model.
Pauluhn Anuschka
Solanki Sami K.
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