Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640709w&link_type=abstract
American Astronomical Society, AAS Meeting #216, #407.09; Bulletin of the American Astronomical Society, Vol. 41, p.861
Astronomy and Astrophysics
Astronomy
Scientific paper
The high temperature emission that is present in the core of an active region is generally unresolved by current solar instrumentation. This makes it difficult to isolate and study individual loops. One way to circumvent this problem is to study the moss, which is the bright emission from the footpoints of hot active region loops seen in many solar EUV images. Moss observations are particularly useful because they provide boundary conditions for physical models of coronal loops without the need to know the loop geometry. With their high spatial and temporal resolution and broad array of diagnostics, the instruments on Hinode have provided many new insights into the properties of the moss. These observations appear to be generally consistent with steady heating in high temperature active region loops. Fast scans with EIS, for example, show that the moss intensities, Doppler shifts, and nonthermal velocities are constant over many hours. Our initial analysis of SOT Ca data from the moss also shows remarkably constant emission even at this very high spatial resolution. Steady heating models are consistent with the intensities observed with EIS. In this talk we review Hinode observations and modeling of the moss emission and extend these models to simulations of entire active regions.
Brooks David H.
Warren Harry
Winebarger Amy R.
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