Other
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..697l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 15, 1985, p. 697-701.
Other
6
Astronomical Photography, Chromosphere, Coronal Loops, Solar Prominences, Doppler Effect, Electron Density (Concentration), Electron Energy, H Alpha Line, High Resolution, Solar Spectra
Scientific paper
Values of the electron temperature, electron density, gas density, gas pressure, degree of hydrogen ionization, and other physical conditions are determined at seven locations along the axis of an H-alpha active-region loop observed on the solar disk. Combining these data with earlier results, a fairly complete description is presented of the true geometry, flow velocities, and thermodynamic conditions in such a loop at one moment of time. The physical conditions show a marked variation along the loop. The variations in density and pressure exhibit a wavelike nature, with an apparent wavelength of some 50,000-60,000 km. The results offer the prospect of putting observational constraints on theoretical models of coronal loops and of identifying the types of flows and waves present.
Bray Roger J.
Loughhead R. E.
Wang Jane-Ling
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