Zobrazeno 1 - 10
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pro vyhledávání: '"Chelpanov, A. A."'
Autor:
Chelpanov, Andrei, Kobanov, Nikolai
In the immediate sunspots' vicinity -- their superpenumbra -- 3-minute line-of-sight (LOS) velocity oscillations dominate in the photosphere and chromosphere. Oscillations of similar periods are also registered in the transition region and lower coro
Externí odkaz:
http://arxiv.org/abs/2409.15701
Autor:
Chelpanov, A. A., Kobanov, N. I.
Publikováno v:
Solar Physics (2022), vol. 297, Article id.154
Registering periodic variations of spectral line widths serves as the main method for observing torsional Alfv\'{e}n waves. Theoretically, the method seems valid, yet it entails a number of caveats when applied to data. For instance, the amplitudes o
Externí odkaz:
http://arxiv.org/abs/2212.13710
Autor:
Chelpanov A.A.
Publikováno v:
Solar-Terrestrial Physics, Vol 10, Iss 1, Pp 3-9 (2024)
This paper summarizes the body of work that we have done over the years on the oscillation processes in sunspots, including their umbra, penumbra, and close vicinity. The study analyzes a number of aspects that impede adequate determining of some cha
Externí odkaz:
https://doaj.org/article/01b782da312a4c729bc5f099244c90bd
The subject of this study is oscillations in the lower atmosphere in coronal-hole regions, where the conditions are favorable for propagation between the atmospheric layers. Based on spectroscopic observations in photospheric and chromospheric lines,
Externí odkaz:
http://arxiv.org/abs/2110.12672
Autor:
Chelpanov, Andrei, Kobanov, Nikolai
We performed a multi-wave study of the oscillation dynamic in short-lived facula regions during their lifetime. We studied oscillations in five regions, three of which belonged to the beginning of the current solar activity cycle, and two of them exi
Externí odkaz:
http://arxiv.org/abs/2202.07239
Autor:
Chelpanov, Andrei, Kobanov, Nikolai
We propose a method for diagnosing the physical conditions in the solar atmosphere using an increase in oscillation amplitudes resulting from minuscule solar flares. As an example, we consider a B2 flare, which caused a sharp short-lived increase in
Externí odkaz:
http://arxiv.org/abs/2110.12732
Autor:
Chelpanov, K. V.
We give a proof for sharp estimate for the number of spanning trees using linear algebra and generalize this bound to multigraphs. In addition, we show that this bound is tight for complete graphs. In addition, we give estimates for number of spannin
Externí odkaz:
http://arxiv.org/abs/2103.00310
Autor:
Chelpanov, Andrei, Kobanov, Nikolai
For the first time, a multi-wave research of oscillation dynamics in a solar facula from its birth to decay was carried out. We performed spectral observations of active region NOAA 12744 at Horizontal Solar Telescope of the Sayan Solar Observatory i
Externí odkaz:
http://arxiv.org/abs/2006.05223
Autor:
Chelpanov M. A., Anfinogentov S. A., Kostarev D. V., Mikhailova O. S., Rubtsov A. V., Fedenev V. V., Chelpanov A. A.
Publikováno v:
Solar-Terrestrial Physics, Vol 8, Iss 4, Pp 3-27 (2022)
Magnetohydrodynamic (MHD) waves play a crucial role in the plasma processes of stellar atmospheres and planetary magnetospheres. Wave phenomena in both media are known to have similarities and unique traits typical of each system. MHD waves and relat
Externí odkaz:
https://doaj.org/article/bb50bcd55521491fbc0aa3fcebf4cfa3
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