The Effect of Radiative Cooling on Coronal Loop Oscillations

Astronomy and Astrophysics – Astronomy

Scientific paper

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Sun: Corona, Sun: Oscillations, Sun: Uv Radiation

Scientific paper

Coronal loops that exhibit kink-mode oscillations have generally been assumed to have a constant density and temperature during the observed time interval. Analyzing their intensities in an EUV wave band, however, clearly shows that their brightness varies in a way that is consistent with a temperature cooling through the EUV passband, which limits their detection time, observed damping time, and number of observable periods. We study kink-mode oscillations of eight loops observed during the so-called harmonica event on 2001 April 15, 21:58-22:27 UT in the 171 Å band. We find loop densities of ne=(1.4+/-0.6)×109 cm-3, loop widths of w=2.0+/-2.6 Mm, and e-folding cooling times of τcool=17+/-7 minutes, when they cool through the peak temperature T=0.95 MK of the 171 Å band. We conclude that oscillations of a single loop cannot be detected longer than 10-20 minutes in one single filter and appropriate light curve modeling is necessary to disentangle the subsequent oscillation phases of multiple near-cospatial loops.

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