Mathematics – Logic
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........3p&link_type=abstract
Ph.D. Thesis Colorado Univ., Boulder.
Mathematics
Logic
Solar Atmosphere, Solar Flares, Solar Maximum Mission, Ultraviolet Spectra, Energy Dissipation, Helium, Resonance, Spatial Resolution, Spectroheliographs, Spectrum Analysis, Temporal Resolution
Scientific paper
Heating processes in the outer solar atmosphere manifest themselves in continuous and discrete phenomena ranging from te largest solar flares down to the smallest events discernible with present instruments. Two such phenomena are addressed as seen in ultraviolet observations of the solar transition zone; data obtained with the Solar maximum Mission (SMM) satellite are found to reveal the presence of frequent and rapid brightenings in ultraviolet line emission in active regions, and observations obtained with the NRL Slitless Spectroheliograph on Skylab are analyzed to determined the role of the helium resonance lines in the energy balance of a large class M flare. SMM observations with high spatial and temporal resolution at small bright sites in active regions show significant increases in intensity in spectral lines of Si IV and O IV on short time scales. Intensity increases of 20 to 100% are common and typically last 40 to 60 s. These characteristics suggest that topological dissipation of energy stored in the magnetic field is occurring more frequently and on smaller spatial scales than previously observed.
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