Solar active regions: The footpoints of 1 MK loops

Details Solar active regions: The footpoints of 1 MK loops Solar active regions: The footpoints of 1 MK loops

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...406l...5d&link_type=abstract

Astronomy and Astrophysics, v.406, p.L5-L8 (2003)

Astronomy and Astrophysics

Astrophysics

16

Sun: Corona, Sun: Transition Region, Sun: Abundances, Techniques: Spectroscopic

Scientific paper

On-disc SOHO and TRACE observations of the footpoints of 1 MK quiescent loops in a solar active region are presented. These types of loops are long-lived and high-lying features that are best seen in the TRACE 173 Å passband, sensitive to 1 MK temperatures. SOHO/CDS data are used to show the clear association between the high-lying 1 MK coronal emission and emission formed at lower heights and temperatures, in the transition region. The 1 MK loops are rooted in strong unipolar regions located at the supergranular network boundaries. These loops have near-isothermal distributions at each location along their length, with peak emission measures at T=0.7 MK, where electron densities are ~ 2 x 109 cm-3. The loops showed photospheric abundances, at odds with previous results based on Skylab data.

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