Measuring electron density in coronal active regions. II - A multichannel coronagraph with a photoelectric spectrograph and a reflex monitor at lambda 5303 A

Details Measuring electron density in coronal active regions. II - A multichannel coronagraph with a photoelectric spectrograph and a reflex monitor at lambda 5303 A Measuring electron density in coronal active regions. II - A multichannel coronagraph with a photoelectric spectrograph and a reflex monitor at lambda 5303 A

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...94..117n&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 94, Aug. 1984, p. 117-131.

Physics

6

Coronagraphs, Electron Density (Concentration), Solar Activity, Solar Corona, Spectroheliographs, Emission Spectra, Iron, Line Spectra, Solar Spectra

Scientific paper

In order to study the electron density at the scale of the most encountered structures in coronal active regions a new multichannel coronagraph associated with a photoelectric spectrograph is now used at the Pic-du-Midi Observatory. In its quasi-routine mode this instrument, which is described in this paper, works with a 30 arcsec field aperture in a parallel manner with a K-polarimeter. On each observed region it obtains maps of intensities of the 3388, 10747, and 10798 A emission lines due to Fe XIII ion. Each measurement point is associated with a quasi-simultaneous image of the emission corona structures viewed in the light of the 5303 A line of Fe XIV. Three examples of observations are given and the capabilities are discussed. Measuring electron density in coronal active regions. II A multichannel photoelectric coronagraph with a photo-electric spectrograph and a reflex monitor at 5303 A.

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