32 citations · 172 across the 17 of their papers we have counts for
17 papers
Three-Minute Oscillations in Sunspot's Penumbrae and Superpenumbrae. Alfvénic or Sound?
Andrei Chelpanov, Nikolai Kobanov
In the immediate sunspots' vicinity -- their superpenumbra -- 3-minute line-of-sight (LOS) velocity oscillations dominate in the photosphere and chromosphere. Oscillations of simil…
Problems in Observation and Identification of Torsional Waves in the Lower Solar Atmosphere
A. A. Chelpanov, N. I. Kobanov
Registering periodic variations of spectral line widths serves as the main method for observing torsional Alfvén waves. Theoretically, the method seems valid, yet it entails a numb…
Oscillation Dynamics in Short-Lived Facula Regions during Their Lifetime
Andrei Chelpanov, Nikolai Kobanov
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…
Using Flare-Induced Modulation of Three- and Five-Minute Oscillations for Studying Wave Propagation in the Solar Atmosphere
Andrei Chelpanov, Nikolai Kobanov
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,…
Propagating Oscillations in the Lower Atmosphere under Coronal Holes
Andrei Chelpanov, Nikolai Kobanov, Maksim Chelpanov +1
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…
Multilevel Observations of the Oscillations in the First Active Region of the New Cycle
Andrei Chelpanov, Nikolai Kobanov
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 NOA…
Oscillations Accompanying a He I 10830 Å Negative Flare in a Solar Facula II. Response of the Transition Region and Corona
Nikolai Kobanov, Andrei Chelpanov
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 So…
Oscillations accompanying a He I 10830 Å negative flare in a solar facula
Andrei Chelpanov, Nikolai Kobanov
On September 21, 2012, we carried out spectral observations of a solar facula in the Si I 10827 Å, He I 10830 Å, and Hα spectral lines. Later, in the process of analyzing the data,…
Negative flare in the He I 10830 Å line in facula
Nikolai Kobanov, Andrei Chelpanov, Vasiliy Pulyaev
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 re…
Peculiarity of the oscillation stratification in sunspot penumbrae
D. Y. Kolobov, A. A. Chelpanov, N. I. Kobanov
Spatial distributions of the dominant oscillation frequency obtained for four sunspots show a feature shared by all the analysed levels of the solar atmosphere in these sunspots. T…
Influence of the Magnetic Field on Oscillation Spectra in Solar Faculae
Andrei A. Chelpanov, Nikolai I. Kobanov, Dmitry Y. Kolobov
In this work, we studied oscillation parameters in faculae above magnetic knots and in the adjacent to them areas. Using SDO data we analysed oscillations in magnetic strength, Dop…
Behaviour of oscillations in loop structures above active regions
D. Y. Kolobov, N. I. Kobanov, A. A. Chelpanov +5
In this study we combine the multiwavelength ultraviolet -- optical (Solar Dynamics Observatory, SDO) and radio (Nobeyama Radioheliograph, NoRH) observations to get further insight…
Oscillations Above Sunspots and Faculae: Height Stratification and Relation to Coronal Fan Structure
N. I. Kobanov, D. Y. Kolobov, A. A. Chelpanov
Oscillation properties in two sunspots and two facular regions are studied using Solar Dynamics Observatory (SDO) data and ground-based observations in the SiI 10827 and HeI 10830…
Oscillations above sunspots from the temperature minimum to the corona
N. I. Kobanov, A. A. Chelpanov, D. Y. Kolobov
Context. An analysis of the oscillations above sunspots was carried out using simultaneous ground-based and Solar Dynamics Observatory (SDO) observations (SiI 10827A, HeI 10830A, F…
Direct measurement results of the time lag of LOS-velocity oscillations between two heights in solar faculae and sunspots
Nikolai Kobanov, Dmitri Kolobov, Arseniy Kustov +2
We present an investigation of line-of-sight (LOS) velocity oscillations in solar faculae and sunspots. To study the phase relations between chromosphere and photosphere oscillatio…
Height distribution of the power of 3-min oscillations over sunspots
N. I. Kobanov, D. Y. Kolobov, S. A. Chupin +1
Context. The height structure of 3-min oscillations over sunspots is studied in the context of the recently discovered effect of height inversion: over the umbra, the spatial locat…
Multilevel Analysis of Oscillation Motions in Active Regions of the Sun
V. E. Abramov-Maximov, G. B. Gelfreikh, N. I. Kobanov +2
We present a new method that combines the results of an oscillation study made in optical and radio observations. The optical spectral measurements in photospheric and chromospheri…