Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke.141s&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
Solar prominences owe their importance in the solar physics due to their formation in the hot million degree corona, long term stability and eventual eruption in the form of Coronal Mass Ejections (CMEs) that play an important role in the space weather and solar-terrestrial relations. Oscillations in prominences have been known for a long time and these have been interpreted in terms of the linear MHD waves. The typical features of damped oscillatory motions in prominences are still unexplained. We here report the results on the effects of radiative losses due to Newtonian cooling that have been considered to examine for the spatial damping of magnetoacoustic waves in quiescent prominences. The radiative losses give acceptable damping lengths for the slow mode wave for relaxation times in the range (10-103s). The fast mode waves damp over a larger distance. From prominence seismology, the values of opacity have been inferred. It has been found that for a given value of radiative relaxation time, the high frequency slow mode waves are highly damped. The damping length has been found to be of the order of 103 -104 km for the slow mode waves with the period of oscillations between 5 and 46 min.
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