Other
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.7902f&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #79.02; Bulletin of the American Astronomical Society, Vol. 31, p.963
Other
Scientific paper
Recent observations of solar active regions with the Transition Region And Coronal Explorer (TRACE) have revealed finely textured, low-lying extreme ultraviolet (EUV) emission, called the ``moss'', appearing as a bright dynamic pattern with dark inclusions. The moss has been interpreted as the upper transition region by Berger et al., (1999). In this study we use simultaneous SOHO Coronal Diagnostic Spectrometer (CDS) and TRACE observations of Active Region (AR) 8227 on 30-May-1998 to determine the physical parameters of the moss material. A differential emission measure (DEM) analysis and other diagnostic tools establish that the plasma responsible for the moss emission has a temperature range of 0.6-1.5 * 10(6) K and is associated with hot loops (T > 2 * 10(6) K) observed with CDS. This plasma has an electron density of 2-5* 10(9) cm(-3) at a temperature of 1.3 * 10(6) K, giving a pressure of 0.7-1.7 dyne cm(-2) . Both the density and pressure in the moss plasma are a few times higher than in coronal loops observed in the TRACE Fe IX/X 171 Angstroms passband. The volume filling factor of the moss plasma is of the order 0.1 and the path along which the emission originates is of the order 1,000 km long.
de Pontieu Bart
Fletcher Lauren
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