The article presents the results of studies of the emission coronal line λ = 6374 Å (FeX) for the period of solar cycle 24. The spectral data were obtained with an out-of-eclipse Lyot coronagraph at the Mountain Astronomical Station of the Pulkovo Observatory, Russian Academy of Sciences (near Kislovodsk). Based on the processing of the results of out-of-eclipse observations, a database of three types of daily coronal maps with a distribution by altitude h from 1 to 1.38 R (R is the radius of the Sun) of the red line intensity (I6374) was created. Throughout the solar cycle, spectral observations demonstrating a Doppler shift along the red line λ = 6374 Å were found. The extension of the red line from the limb position angle of the Sun was calculated. It was shown that the maximum value of the average extension of the coronal line over the entire limb falls on the rise phase of solar cycle 24. For different phases of the considered solar cycle (for the rise phase, the period of maximum, the decline phase and the minimum of solar activity) and for different regions of solar activity, the dependences of the change in I6374 values with altitude were plotted and explained. A regression analysis of the obtained relationships is carried out. The regression equations are presented. The changes in I6374 with altitude for the polar regions (for all phases of the cycle except for the maximum and the decline phase) and for the middle latitudes (for the minimum of activity) most likely have a logarithmic dependence, and the approximating trend curves for the remaining latitudinal zones are determined by a third-order power function.


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    Title :

    Study of the Red Coronal Line with Altitude from Out-of-Eclipse Observations during Solar Cycle 24


    Additional title:

    Cosmic Res


    Contributors:

    Published in:

    Cosmic Research ; 63 , 1 ; 47-55


    Publication date :

    2025-02-01


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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