Zobrazeno 1 - 10
of 374
pro vyhledávání: '"Chelpanov A. A."'
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
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
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:
Kobanov, Nikolai, Chelpanov, Andrei
We studied oscillations related to flare SOL2012-09-21T02:19 in the transition region and chromosphere based on Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and Solar Dynamics Observatory (SDO) data, as well as data from a ground-bas
Externí odkaz:
http://arxiv.org/abs/1904.11142
Autor:
Chelpanov, Andrei, Kobanov, Nikolai
On September 21, 2012, we carried out spectral observations of a solar facula in the Si I 10827 {\AA}, He I 10830 {\AA}, and H{\alpha} spectral lines. Later, in the process of analyzing the data, we found a small-scale flare in the middle of the time
Externí odkaz:
http://arxiv.org/abs/1810.10153
A small-scale flare SOL2012-09-21T02:19 (B2) occurred in a spotless active region that we observed at a ground-based telescope equipped with a spectrograph. During the flare, we registered an increase in absorption in the He I 10830 \AA\ line by 25%,
Externí odkaz:
http://arxiv.org/abs/1712.10117