Anti-phase oscillations of H
                
                    
                                    
                        α
                    
                
                $\alpha$
             line Doppler velocity and width in solar limb spicules

Khutsishvili, D.; Zaqarashvili, T. V.; Khutsishvili, E. V.; Kvernadze, Teimuraz; Kulidzanishvili, V. I.; Kakhiani, V. O.; Sikharulidze, M.

doi:10.1007/s10509-017-3213-x

Cited by 4 publications

(4 citation statements)

References 42 publications

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“…The authors determined the properties of spicules and calculated the oscillations present in these structures. The study by Khutsishvili et al (2017) also revealed that the oscillations of Doppler velocity and width appear to be out of phase with one another. This anti-phase relation is determined from the strong Doppler velocity to weaker Doppler width and vice-versa.…”

Section: Wave Phenomena In Solar Jetsmentioning

confidence: 91%

“…This velocity will depend on the location of the observer (or Line-of-Sight) relative to the flux tube's bulk transverse motion (see Figure 11) and the radiative properties of the plasma along the line of sight. Doppler shift oscillations have recently been observed in Hα solar spicules (Zaqarashvili et al, 2007a;De Pontieu et al, 2012;Khutsishvili et al, 2014Khutsishvili et al, , 2017. The authors determined the properties of spicules and calculated the oscillations present in these structures.…”

Section: Wave Phenomena In Solar Jetsmentioning

confidence: 99%

See 1 more Smart Citation

Small-scale solar jet formation and their associated waves and instabilities

Skirvin

Verth

González-Avilés

et al. 2023

Advances in Space Research

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Section: Wave Phenomena In Solar Jetsmentioning

confidence: 91%

Section: Wave Phenomena In Solar Jetsmentioning

confidence: 99%

Small-scale solar jet formation and their associated waves and instabilities

Skirvin

Verth

González-Avilés

et al. 2023

Advances in Space Research

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“…Oscillations and waves in solar chromosphere and corona and chromospheric spicules are studied (Khutsishvili et al 2017). Observations of spectral lines in the chromosphere by height and time are made using the 53-cm solar coronagraph of ABAO.…”

Section: Research Topicsmentioning

confidence: 99%

Astronomical Research and Outreach in Georgia

Todua¹

2018

ComBAO

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Interest in astronomy has been significantly increased in Georgia. As a result, the development of astronomical research, education and public outreach are in progress. In Abastumani Astrophysical Observatory - a research institution at Ilia State University - the observational and theoretical studies comprise a wide range of topics in astronomy and adjacent fields: solar system bodies, solar physics, stellar and extragalactic astronomy, theoretical astrophysics, cosmology, atmospheric and near space physics. Georgian scientists are involved in wide international collaboration and participate in a number of networks and projects. Astronomical education at bachelor, master and doctoral levels are held at Ilia University. PhD programs are also offered at other universities. In 2018, under the financial support of the World Bank and Georgian government, the renovation of Abastumani Observatory has been started. International conferences and workshops have been carried out in Georgia. Excursions at the Observatory and public lectures in astronomy throughout the country are carried out. Amateur astronomers organize astronomical events. A private observatory is under construction near Tbilisi. All these puts better perspective for future development of astronomy in Georgia.

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“…Variation of the parameters with the heights need to be measured. Wave motions have been sought in the chromosphere and TR over a wide range of frequencies (Nikolskii 1965;Tavabi et al 2015b;Khutsishvili et al 2017). Fluctuations in Doppler velocity and intensity are also observed in the 10 5 K plasma.…”

Section: Introductionmentioning

confidence: 99%

Chromospheric Peculiar Off-limb Dynamical Events from IRIS Observations

Tavabi

Koutchmy

2019

ApJ

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To study motions and oscillations in the solar chromosphere and at the transition region (TR) level we analyze some extreme Doppler shifts observed off-limb with the Interface Region Imaging Spectrograph (IRIS). Raster scans and slit-jaw imaging observations performed in the near-ultraviolet (NUV) channels were used. Large transverse oscillations are revealed by the far wings profiles after accurately removing the bulk average line profiles of each sequence. Different regions around the Sun are considered. Accordingly, the cool material of spicules is observed in Mg II lines rather dispersed up to coronal heights. In the quiet Sun and especially in a polar coronal hole, we study dynamical properties of the dispersed spiculesmaterial off-limb using a high spectral, temporal and spatial resolutions IRIS observations. We suggest that numerous smallscale jet-like spicules show rapid twisting and swaying motions evidenced by the large distortion and dispersion of the line profiles, including impressive periodic Doppler shifts. Most of these events repeatedly appear in red-and blue-shifts above the limb throughout the whole interval of the observation datasets with an average swaying speed of order ±35 kms -1 reaching a maximum value of 50 km s -1 in the polar coronal hole region, well above the 2.2 Mm heights. We identified for the 1 st time waves with a short period of order of 100 sec and less and transverse amplitudes of order of ± 20 to 30 km s -1 with the definite signature of Alfven waves. No correlation exists between brightness and Doppler shift variations; the phase speed of the wave is very large and cannot definitely be determined from the spectral features seen along the quasi-radial features. Even shorter periods waves are evidenced, although their contrast is greatly attenuated by the overlapping effects along the line of sight.

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Anti-phase oscillations of H α $\alpha$ line Doppler velocity and width in solar limb spicules

Cited by 4 publications

References 42 publications

Small-scale solar jet formation and their associated waves and instabilities

Small-scale solar jet formation and their associated waves and instabilities

Astronomical Research and Outreach in Georgia

Chromospheric Peculiar Off-limb Dynamical Events from IRIS Observations

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