Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..36s&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
It is generally believed that magnetic pressure is much higher than the gas pressure in the coronal loops and these loops are isothermal in nature. We have made systematic observations of all the 4 strong coronal emission lines in the visible and near infrared part of the spectrum for about 8 years. Two emission lines were chosen at a time to make the raster scans of steady coronal region. We have studied the variation of line widths of these lines and intensity ratios as a function of height. The relationship between the widths of these lines and intensity ratio indicates that the steady coronal loops are not magnetically isolated. These findings put restrictions on coronal loops models and indicate that magnetic pressure in coronal loops may be much less than assumed. These results strongly suggest that magnetic field in the corona need to be measured accurately.
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