Abstract
Thirty small-scale structures in the solar atmosphere, i.e., facula nodes at ±(20°–46°) latitudes, have been studied in order to analyze quasi-periodic variations in the magnetic field. SDO/HMI magnetograms have been used for this purpose. Long-period variations in the magnetic field strength of the considered objects in the 60–280 min range have been revealed as a result of data processing. It has been shown that there are no dependences between the magnetic field and period, nor between the magnetic field and object area. It has been assumed that the discovered variations are not natural oscillations of the magnetic field strength.
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Abramov-Maximov, V.E., Gelfreikh, G.B., Kobanov, N.I., Shibasaki, K., and Chupin, S.A., Multilevel analysis of oscillation motions in active regions of the sun, Sol. Phys., 2011, vol. 270, pp. 175–189.
Bakunina, I.A., Abramov-Maximov, V.E., Lesovoy, S.V., Shibasaki, K., Solov’ev, A.A., and Tikhomirov, Yu.V., Long-period oscillations of microwave emission of solar active regions: Observations with NoRH and SSRT, Symp. —Int. Astron. Union, 2009, vol. 257, pp. 155–157.
Couvidat, S., Schou, J., Shine, R.A., et al., Wavelength dependence of the helioseismic and magnetic imager (HMI) instrument onboard the solar dynamics observatory (SDO), Sol. Phys., 2012, vol. 275, pp. 285–325.
Efremov, V.I., Parfinenko, L.D., and Solov’ev, A.A., Long-period oscillations of the line-of-sight velocities in and near sunspots at various levels in the photosphere, Astron. Rep., 2007, vol. 51, no. 5, pp. 401–410.
Gelfreikh, G.B., Nagovitsyn, Y.A., and Nagovitsyna, E.Y., Quasi-periodic oscillations of microwave emission in solar active regions, Publ. Astron. Soc. Jpn., 2006, vol. 58, pp. 29–35.
Huang, N.E., Zheng, S., Long, S.R., Wu, M.C., Shih, H.H., Zheng, Q., Yen, N.-C., Tung, C.C., and Liu, H.H., The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis, Proc. R. Soc. London, Ser. A, 1998, vol. 454, pp. 903–995.
Nagovitsyna, E.Yu. and Nagovitsyn, Yu.A., Spatial variations in parameters of quasi-hourly sunspot fragment oscillations and a singular penumbra oscillator, Astron. Lett., 2002, vol. 28, pp. 121–129.
Nagovitsyn, Yu.A. and Nagovitsyna, E.Yu., Long-period oscillation processes in sunspot groups (ground-based and exoatmospheric observations), Geomagn. Aeron. (Engl. Transl.), 2011, vol. 51, no. 8, pp. 1049–1053.
Nagovitsyn, Yu.A., Rybak, A.L., and Nagovitsyna, E.Yu., Magnetic field variations and spatial configurations of long-period sunspot oscillations according to the SOHO data, Geomagn. Aeron. (Engl. Transl.), 2012, vol. 52, no. 7, pp. 902–907.
Kobanov, N.I. and Pulyaev, V.A., Features of spatial distribution of oscillations in faculae regions, Sol. Phys., 2011, vol. 268, no. 2, pp. 329–334.
Smirnova, A., Riehokainen, A., Solov’ev, A., Kallunki, J., Zhiltsov, A., and Ryzhov, V., Long quasi-periodic oscillations of sunspots and nearby magnetic structures, Astron. Astrophys., 2013, vol. 552, A23.
Solov’ev, A. and Kirichek, E., Basic properties of sunspots: Equilibrium, stability and long-term eigen oscillations, Astrophys. Space Sci., 2014, vol. 352, no. 1, pp. 23–42.
Strekalova, P.V., Nagovitsyn, Yu.A., Riehokainen, A., and Smirnova, V.V., Temporal variations in the magnetic field of solar faculae, in Solnechnaya i solnechno-zemnaya fizika-2015. Trudy Konferentsii (Solar and Solar–Terrestrial Physics: Proceedings of Conference), 2015, pp. 339–342.
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Strekalova, P.V., Nagovitsyn, Y.A., Riehokainen, A. et al. Long-period variations in the magnetic field of small-scale solar structures. Geomagn. Aeron. 56, 1052–1059 (2016). https://doi.org/10.1134/S0016793216080211
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DOI: https://doi.org/10.1134/S0016793216080211