X-rays spectroheliograms in lines of Mg xi and Mg xii |
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| Authors: | C Bonnelle C Senemaud G Senemaud G Chambe M Guionnet J C Henoux R Michard |
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| Institution: | (1) Laboratoire de Chimie Physique de l'Université de Paris VI 11, rue Pierre et Marie Curie, 75231, 05 Paris Cedex, France;(2) Observatoire de Paris, 92 Meudon, France |
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| Abstract: | Spectroheliograms in the L Mg xii line and in the Mg xi resonance (R) 1s
21
S
0-1s2p
1
P
1 line, intercombination (I) 1s
21
S
0-1s2p
3
P
1,2, line, and the forbidden (F) 1s
21
S
0-1s2s
3
S
1 line, have been obtained.Two Bragg crystal spectrometers were used mounted with mechanical collimators to obtain a spatial resolution of 1 × 3. The apparatus was launched on a sounding rocket on July 2nd, 1971. A particularly thorough study was made of the brightest active region (MC 11402).Variations in the F to I Mg xi line intensity ratio from one point to another in the active region did not reveal the presence of high electron densities.The observed intensities of the Mg xi
R line, Mg xii L line and Mg x 1s
22s
2
S
1/2-1s2p
1
P 2s × × 2
P11/2, 3/2
S line are not well explained by an isothermal model. Good agreement between computed and observed intensities is obtained using the non-isothermal model proposed here. |
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| Keywords: | |
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