Investigation of the Mg XII 8.42 Å doublet in solar flare spectra |
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| Authors: | B Sylwester P Faucher J Jakimiec V V Krutov R W P McWhirter J Sylwester M Tomczak S Volonté I A Zhitnik |
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| Institution: | (1) Space Research Center of Polish Academy of Sciences, Wroclaw, Poland;(2) Astronomical Institute of the Wroclaw University, Poland;(3) Lebedev Physical Institute, Moscow, U.S.S.R.;(4) Rutherford Appleton Laboratory, Oxfordshire, U.K.;(5) Département d'Astrophysique, Université de Mons, Belgium;(6) Observatoire de Nice, France |
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| Abstract: | The intensity ratio of the components of the Mg xii 8.42 Å (1s
2
S
1/2 – 2p
2
P
1/2, 3/2) doublet in solar flare spectra has been investigated using observations recorded from the Intercosmos 7 satellite. The observed values of the ratio fall within the interval 0.38–0.66 and have been compared with recent theoretical predictions based on an optically thin collisional-radiative model. It has been found that for the flare plasma the low values of the ratio cannot be explained since they fall below the smallest theoretical value. The highest values on the other hand require that an unacceptably high electron density be postulated. It is suggested that both high and low values may be caused by the resonance line scattering of the Mg xii quanta in the flare volume, provided that the volume is elongated and not spherical.The intensity of the nearby satellite lines is also investigated. Good agreement between the theoretical and observed intensities is found. |
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