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Measuring electron density in coronal active regions

✍ Scribed by J. C. Noëns; J. Pageault; G. Ratier

Publisher
Springer
Year
1984
Tongue
English
Weight
1015 KB
Volume
94
Category
Article
ISSN
0038-0938

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✦ Synopsis

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" field aperture in a parallel manner with a K-polarimeter. On each observed region it obtains maps of intensities of the 223388, 10747, and 10798 A emission lines due to Fexiii ion. Each measurement point is associated with a quasi-simultaneous image of the emission corona structures viewed in the light of the 25303 ~. line of Fe • 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 25303 4. * LA du CNRS No. 040285.

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