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Seasonal change of CH4/H2 ratio in the atmosphere of Uranus
Uranus is mainly composed of elements heavier than hydrogen and helium, such as C, S, even though very little information about these elements has...
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Study of the travelling interplanetary shocks, their earth crossings and resulting geomagnetic disturbances
Fast moving coronal mass ejections (CMEs) travelling in interplanetary (IP) space generally drive shocks ahead of their leading edges. Such...
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Comparison of Cylindrical Interplanetary Flux-Rope Model Fitting with Different Boundary Pitch-Angle Treatments
Interplanetary flux ropes (IFRs) observed in the solar wind have been investigated through application of the Lundquist model, which is a cylindrical...
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Multi-frequency properties of an interacting narrow-angle tail radio galaxy J0037+18
We report multi-wavelength and multi-band observations of a radio galaxy, J0037+18, optical counterpart of which appears to be interacting with the...
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The vacuum polarization paradox and its solution
In this article various heuristic approaches are discussed to solve the dark matter phenomenon by the concept of vacuum polarization. They are...
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The high energy emission of the Crab’s twin pulsar PSR J0540-6919 in the Large Magellanic Cloud
In the present paper, we discuss theoretical interpretation of the X-ray and gamma-ray emission of the extremely bright pulsar PSR J0540-6919, in the...
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Discrete evolution model based on mean spatial density for space debris environment
Concerning the increasing space debris and its collision threat on operational satellites, a simple and less computation consuming model is built to...
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Probing the dynamical system and thermal behaviors of the model, \(\varLambda _{0}+3 \beta H^{2}\)
In this work we study the cosmological evolution of a two component model with non-relativistic dark matter and decaying vacuum of the form
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A Search for High-Frequency Coronal Brightness Variations in the 21 August 2017 Total Solar Eclipse
We report on a search for short-period intensity variations in the green-line (Fe xiv 530.3 nm) emission from the solar corona during the 21 August...
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The rare extended radio-loud narrow-line Seyfert 1 galaxy SDSS J1030+5516 at high resolution
Recently, Rakshit et al. (Astrophys. J. 869:173,
2018 ) reported the discovery of SDSS J103024.95+ 551622.7, a radio-loud narrow-line Seyfert 1 galaxy...
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Study of Interplanetary CMEs/Shocks During Solar Cycle 24 Using Drag-Based Model: The Role of Solar Wind
In this paper we analyze a set of 27 fast interplanetary coronal mass ejections (ICMEs) observed during the period January 2010 – December 2013 in...
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Connection Between Solar Hemispheric Toroidal Cycles and Geomagnetic Variations
The solar activity has hemispheric asymmetries. The levels of activity are different on the two hemispheres on intermediate and longer time scales....
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Relativistic model for anisotropic compact stars using Karmarkar condition
In this work we have obtained some families of relativistic anisotropic compact stars by solving of Einstein’s field equations. The field equations...
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The Characteristic Sizes of the Sunspots and Pores in Solar Cycle 24
We present a comparative analysis of the size of spots in sunspot groups. For the analysis, we have used the characteristics of individual sunspots...
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Origin of Solar Rotational Periodicity and Harmonics Identified in the Interplanetary Magnetic Field \(B_{z}\) Component Near the Earth During Solar Cycles 23 and 24
Periodic variations in solar-wind and geomagnetic parameters have long been recognized. In this work, we examine the periodic properties in the...
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Shock waves and the formation of solitary structures in electron acoustic wave in inner magnetosphere plasma with relativistically degenerate particles
The inner magnetosphere of Earth houses relativistically degenerate particles in which the formation of shocks and solitons occurs. In this paper we...
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Revisiting Kunitomo’s Sunspot Drawings During 1835 – 1836 in Japan
We revisit the sunspot drawings made by the Japanese astronomer Kunitomo Toubei during 1835 – 1836 and recount the sunspot group number for each...
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The deformation of quintom dark energy model
In this paper, we are going to study quintom dark energy cosmological model. In that case we introduce the action of gravity which is minimally...
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Can the magneto rotational instability be performed in the presence of strong magnetic field?
According to previous studies, it is known that Magneto-Rotational-Instability (MRI) can produce turbulent in accretion disks and it can be the...
