Chapter 7: Active Region Diagnostics

Details Chapter 7: Active Region Diagnostics Chapter 7: Active Region Diagnostics

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008psa..book..127m&link_type=abstract

"Physics of the Sun and its Atmosphere, eds. B.N. Dwivedi and U. Narain, World Scientific, Singapore (ISBN 978-981-283-271-9), 2

Physics

Scientific paper

Active regions present us with complex and dynamic structures, which look relatively simple, but are in fact very difficult to model and explain. An active region is a region on the Sun where the magnetic field breaks through the surface (photosphere and chromosphere) to form giant arches of hot plasma. The magnetic field is stronger than in surrounding regions and the plasma is hotter, so emits strongly in UV and X-ray radiation. Figures 7.1 and 7.2 show UV images of the Sun taken with the Transition Region and Coronal Explorer (TRACE) spacecraft and the Extreme Ultraviolet Imaging Telescope (EIT) aboard the Solar and Heliospheric Observatory (SOHO) spacecraft. The hot plasma (around a million degree) traces out the magnetic field structures...

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