Abstract
We present here the results of emission tomography studies, based on a new differential deconvolution method (DDM) of Laplace transform inversion, which we use for reconstruction of the coronal emission measure distributions in the quiet Sun, coronal holes and plage areas. Two methods are explored. The first method is based on the deconvolution of radioemission brightness spectra in a wide wavelength range (1 mm–100 cm) for temperature profile reconstructions from the corona to the deeper chromosphere. The second method uses radio brightness measurements in the cm–dm range to give a coronal column emission measure (EM).
Our results are based on RATAN-600 observations in the range 2.0–32 cm supplemented by the data of other observatories during the period near minimum solar activity. This study gives results that agree with known estimates of the coronal EM values, but reveals the absence of any measurable quantities of EM in the transition temperature region 3 × 104 –105 K for all studied large-scale structures. The chromospheric temperature structure (T e = 20,000–5800 K) is quite similar for all objects with extremely low-temperature gradients at deep layers.
Some refraction effects were detected in the decimeter range for all Types of large-scale structures, which suggests the presence of dense and compact loops (up to N e =(1–3)× 109 cm-3 number density) for the quiet-Sun coronal regions with temperature T e > 5× 10-5 K.
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Bogod, V.M., Grebinskij, A.S. Large-Scale Structure of the Atmosphere of the Quiet Sun, Coronal Holes, and Plages as Deduced by Tomography Study. Solar Physics 176, 67–86 (1997). https://doi.org/10.1023/A:1004929418335
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DOI: https://doi.org/10.1023/A:1004929418335