2.5k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Ilia State UniversityGE219 papers
- Instituto de Astrofísica de AndalucíaES90 papers
- Center for Astrophysics Harvard & SmithsonianUS82 papers
- Osservatorio Astrofisico di TorinoIT81 papers
- National Institute for AstrophysicsIT77 papers
- Boston UniversityUS72 papers
- Pulkovo ObservatoryRU71 papers
- Instituto de Astrofísica de CanariasES70 papers
- Space Research InstituteRU70 papers
- Centre National de la Recherche ScientifiqueFR69 papers
- Kansas State UniversityUS69 papers
- St Petersburg UniversityRU69 papers
26 papers · 1 filter
Semi-empirical models of spicule from inversion of Ca II 8542 Å line
D. Kuridze, H. Socas-Navarro, J. Koza +1
We study a solar spicule observed off-limb using high-resolution imaging spectroscopy in the Ca II 8542 Å line obtained with the CRisp Imaging SpectroPolarimeter (CRISP) on the Swe…
Dirac and Maxwell systems in split octonions
Merab Gogberashvili, Alexandre Gurchumelia
The known equivalence of 8-dimensional chiral spinors and vectors, also referred to as triality, is discussed for (4+4)-space. Split octonionic representation of SO(4,4) and Spin(4…
Case study on the identification and classification of small-scale flow patterns in flaring active region
E. Philishvi, B. M. Shergelashvili, S. Buitendag +3
We propose a novel methodology to identity flows in the solar atmosphere and classify their velocities as either supersonic, subsonic, or sonic. The proposed methodology consists o…
The dual nature of blazar fast variability. Space and ground observations of S5 0716+714
C. M. Raiteri, M. Villata, D. Carosati +39
Blazar S5 0716+714 is well-known for its short-term variability, down to intra-day time-scales. We here present the 2-min cadence optical light curve obtained by the TESS space tel…
Mode changing, subpulse drifting and nulling in four component conal pulsar PSR J2321+6024
Sk. Minhajur Rahaman, Rahul Basu, Dipanjan Mitra +1
In this study, we report on a detailed single pulse polarimetric analysis of the radio emission from the pulsar J2321+6024 (B2319+60) observed with the Giant Metrewave Radio Telesc…
Circular Polarization of Gravitational Waves from Early-Universe Helical Turbulence
Tina Kahniashvili, Axel Brandenburg, Grigol Gogoberidze +2
We perform direct numerical simulations to compute the net circular polarization of gravitational waves from helical (chiral) turbulent sources in the early Universe for a variety…
Search for Off-pulse emission in Long Period Pulsars
Rahul Basu, Dipanjan Mitra, George I. Melikidze
We have revisited the problem of off-pulse emission in pulsars, where detailed search for the presence of low level radio emission outside the pulse window is carried out. The pres…
Zero net flux MRI-turbulence in disks sustenance scheme and magnetic Prandtl number dependence
George Mamatsashvili, George Chagelishvili, Martin E. Pessah +2
We investigate sustenance and dependence on magnetic Prandtl number () for magnetorotational instability (MRI)-driven turbulence in astrophysical Keplerian disks with zer…
Potential asteroid discoveries by the ESA Gaia mission: Results from follow-up observations
B. Carry, W. Thuillot, F. Spoto +42
Since July 2014, the ESA Gaia mission has been surveying the entire sky down to magnitude 20.7 in the visible. In addition to the millions of stars, thousands of Solar System Objec…
Wray 15-906: a candidate luminous blue variable discovered with WISE, Herschel and SALT
O. V. Maryeva, V. V. Gvaramadze, A. Y. Kniazev +1
We present the results of study of the Galactic candidate luminous blue variable Wray 15-906, revealed via detection of its infrared circumstellar shell (of \approx2 pc in diameter…
Grandma: a network to coordinate them all
S. Agayeva, S. Alishov, S. Antier +75
GRANDMA is an international project that coordinates telescope observations of transient sources with large localization uncertainties. Such sources include gravitational wave even…
Effect of latitudinal differential rotation on solar Rossby waves: Critical layers, eigenfunctions, and momentum fluxes in the equatorial plane
L. Gizon, D. Fournier, M. Albekioni
Retrograde-propagating waves of vertical vorticity with longitudinal wavenumbers between 3 and 15 have been observed on the Sun with a dispersion relation close to that of classica…
X-rays observations of a super-Chandrasekhar object reveal an ONeMg and a CO white dwarf merger product embedded in a putative SN Iax remnant
Lidia M. Oskinova, Vasilii V. Gvaramadze, Goetz Graefener +2
The merger of two white dwarfs (WD) is a natural outcome from the evolution of many binary stars. Recently, a WD merger product, IRAS 00500+6713, was identified. IRAS 00500+6713 co…
Pulsar radio emission mechanism I : On the amplification of Langmuir waves in the linear regime
Sk. Minhajur Rahaman, Dipanjan Mitra, George I. Melikidze
Observations suggest that in normal period radio pulsars, coherent curvature radiation is excited within 10 of the light cylinder. The coherence is attributed to Langmuir mode…
A Mechanism of Spark Motion in Inner Acceleration Region to Investigate Subpulse Drifting in Pulsars
Rahul Basu, Dipanjan Mitra, George I. Melikidze
Coherent radio emission in pulsars is excited due to instabilities in a relativistically streaming non-stationary plasma flow, which is generated from sparking discharges in the in…
Ubiquitous hundred-Gauss magnetic fields in solar spicules
M. Kriginsky, R. Oliver, N. Freij +3
Aims. We use high-resolution spectropolarimetric observations in the Ca ii 8542 A line obtained with the SST to study the magnetic field in solar spicules. Methods. The equations t…
A new class of discontinuous solar wind solutions
Bidzina M. Shergelashvili, Velentin N. Melnik, Grigol Dididze +6
A new class of one-dimensional solar wind models is developed within the general polytropic, single-fluid hydrodynamic framework. The particular case of quasi-adiabatic radial expa…
Primordial magnetic helicity evolution with a homogeneous magnetic field from inflation
Axel Brandenburg, Ruth Durrer, Yiwen Huang +3
Motivated by a scenario of magnetogenesis in which a homogeneous magnetic field is generated during inflation, we study the magnetohydrodynamic evolution of the primordial plasma m…
Fire-hose instability of inhomogeneous plasma flows with heat fluxes
E. S. Uchava, A. G. Tevzadze, B. M. Shergelashvili +2
We study the effects of heat flows and velocity shear on the parallel firehose instability in weakly collisional plasma flow. For this purpose we apply an anisotropic 16-moments MH…
Dynamic kink instability and transverse motions of solar spicules
T. V. Zaqarashvili
Hydrodynamic jets are unstable to the kink instability (m=1 mode in cylindrical geometry) owing to the centripetal force, which increases the transverse displacement of the jet. Wh…
GRANDMA Observations of Advanced LIGO's and Advanced Virgo's Third Observational Campaign
S. Antier, S. Agayeva, M. Almualla +55
GRANDMA is a network of 25 telescopes of different sizes, including both photometric and spectroscopic facilities. The network aims to coordinate follow-up observations of gravitat…
Swift observations of Mrk\,421 in selected epochs. iii. Extreme x-ray timing/spectral properties and multiwavelength lognormality in 2015\,December--2018\,April
B. Kapanadze, A. Gurchumelia, D. Dorner +6
We present the results from the timing and spectral study of Mrk\,421 based mainly on the \emph{Swift} data in the X-ray energy range obtained during the time interval 2015\,Decemb…
The Great Markarian 421 Flare of February 2010: Multiwavelength variability and correlation studies
A. U. Abeysekara, W. Benbow, R. Bird +256
We report on variability and correlation studies using multiwavelength observations of the blazar Mrk 421 during the month of February, 2010 when an extraordinary flare reaching a…
Unravelling the complex behavior of Mrk 421 with simultaneous X-ray and VHE observations during an extreme flaring activity in April 2013
MAGIC collaboration, V. A. Acciari, S. Ansoldi +237
We report on a multi-band variability and correlation study of the TeV blazar Mrk 421 during an exceptional flaring activity observed from 2013 April 11 to 2013 April 19. The study…