Determination of the Height-Temperature Profile Above a Solar Active Region from Multi-Frequency Radio Observations
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866914373204705280 |
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| author | Kaltman, T. I. Stupishin, A. G. Makoev, G. A. |
| author_facet | Kaltman, T. I. Stupishin, A. G. Makoev, G. A. |
| contents | An iterative method is presented for reconstructing the height-temperature profile of the solar atmosphere above a sunspot using multi-frequency spectro-polarimetric microwave observations. It is assumed that the emission is formed predominantly under gyroresonance conditions at harmonics of the electron gyrofrequency, and that the contribution at each frequency is associated with a layer of optical depth of order unity. The frequency-height correspondence is determined from extrapolation of the photospheric magnetic field into the corona. The reconstruction of the profile is reduced to solving an overdetermined system of linear equations with regularization, ensuring noise stability and physical smoothness of the solution. The method is tested on synthetic data for a dipole sunspot model and applied to observations of active region NOAA 11312 obtained with the RATAN-600 radio telescope. The derived temperature profiles are consistent with contemporary models of active regions and reproduce the observed spectra in the 3-18~GHz range with an accuracy of a few percent. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_05713 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Determination of the Height-Temperature Profile Above a Solar Active Region from Multi-Frequency Radio Observations Kaltman, T. I. Stupishin, A. G. Makoev, G. A. Solar and Stellar Astrophysics An iterative method is presented for reconstructing the height-temperature profile of the solar atmosphere above a sunspot using multi-frequency spectro-polarimetric microwave observations. It is assumed that the emission is formed predominantly under gyroresonance conditions at harmonics of the electron gyrofrequency, and that the contribution at each frequency is associated with a layer of optical depth of order unity. The frequency-height correspondence is determined from extrapolation of the photospheric magnetic field into the corona. The reconstruction of the profile is reduced to solving an overdetermined system of linear equations with regularization, ensuring noise stability and physical smoothness of the solution. The method is tested on synthetic data for a dipole sunspot model and applied to observations of active region NOAA 11312 obtained with the RATAN-600 radio telescope. The derived temperature profiles are consistent with contemporary models of active regions and reproduce the observed spectra in the 3-18~GHz range with an accuracy of a few percent. |
| title | Determination of the Height-Temperature Profile Above a Solar Active Region from Multi-Frequency Radio Observations |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2603.05713 |