Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..765m&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
We report numerical simulations of the condensation of plasma in short solar coronal loops which has several interesting physical consequences. Firstly we propose a connection between small cool loops which presumably constitute the solar transition region and prominences in the sense that the same physical mechanism governs their dynamics namely the onset of instability and runaway cooling due to strong radiative losses. Secondly we show that the temporal evolution of these loop models exhibit a cyclic pattern of chromospheric evaporation condensation formation motion of the condensation region to either side of the loop and finally loop reheating with a period of 4000 - 6000 s for a loop of 10 Mm length. Thirdly we have synthesized transition region lines from these simulations which show strong periodic intensity variations making condensation processes in loops a candidate to account for the observed temporal variability of these lines.
Hansteen Viggo
Muller Daniel
Peter Hardi
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