Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..149...51w&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 149, no. 1, p. 51-62
Astronomy and Astrophysics
Astronomy
10
H Alpha Line, Helium, Infrared Astronomy, Infrared Spectra, Iron, Solar Corona, Solar Prominences, Astronomical Maps, Cavities, Coronagraphs, Electron Density Profiles, Line Of Sight, Plasma Density, Skylab Program, Spectrographs, Stellar Models, Velocity Distribution
Scientific paper
With the spectro-coronagraph and the multichannel subtractive double pass spectrograph (MSDP) at the Pic du Midi Observatory two quiescent prominences were observed simultaneously. From the spectro-coronagraph observations 2D maps of He I lambda 10830 A, Fe XIII lambda 10798 and 10747 A line intensities were obtained. In addition, we obtained 2D maps of the radio R of the two iron lines. This radio is used as a diagnostic for determining the density of the hot coronal plasma surrounding prominences. We found that the electron density is higher at the location of the prominences than in the corona, whereas small regions (approximately 40 sec) of lower electron density are unevenly distributed around the prominences indicating that the surrounding corona is highly inhomogeneous. The density of the cavity is reduced by a factor 1.5 compared to the density of the prominence environment (approximately 5 x 108/cu cm. We discuss the existence of cavities around these prominences according to the orientation of their axes relative to the line of sight and according to the velocity field inside the prominences. Constraints on models for prominence formation are derived.
Noens Jacques-Clair
Schmieder Brigitte
Wiik Jun Elin
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