Varghese, A. Saritha, A. C. Willington, N. T. Michael, M. Sebastian, S. Sreekala, G. Venugopal, C.
Published in
Journal of Astrophysics and Astronomy

We studied dust acoustic solitary waves (DASW) in a five component cometary plasma by deriving the Kadomstev–Petiashvili (KP) equation. The five components consist of two components of electrons described by kappa distributions with different temperatures and spectral indices, a lighter (hydrogen) and a heavier (oxygen) ion component, both ion comp...

Katore, S. D. Gore, S. V.
Published in
Journal of Astrophysics and Astronomy

The work is the study of Bianchi type-I models with holographic dark energy in the framework of f(R)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ f(R) $$\end{documen...

Nagaraju, K. Sankarasubramanian, K. Rangarajan, K. E.
Published in
Journal of Astrophysics and Astronomy

Analysis of spectropolarimetric observations of two circular sunspots located close to disk centre in Hα\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\alpha }$$\end{...

Dahal, Pravin Kumar
Published in
Journal of Astrophysics and Astronomy

Ongoing research on pulsar timing array (PTA) to detect gravitational radiation is reviewed. Here, we discuss the use of millisecond pulsars as a gravitational wave detector, the sources of gravitational radiation detectable by PTAs and the current status of PTA experiments pointing out the future possibilities.

Odo, F. C. Aroh, B. E.
Published in
Journal of Astrophysics and Astronomy

We study the distributions of γ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\gamma $$\end{document}-ray properties of a sample of γ\documentclass[12pt]{minimal} \use...

Kumar, Raj Chandra, Ramesh Pande, Bimal Pande, Seema
Published in
Journal of Astrophysics and Astronomy

The study of the solar energetic particle events (SEPs) and their association with solar flares and other activities are very crucial to understand the space weather. Keeping this in view, here we present the study of SEPs (intensity ≥10\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb...

Banks, Timothy Yontan, Talar Bilir, Selçuk Canbay, Remziye
Published in
Journal of Astrophysics and Astronomy

Archival Vilnius CCD photometric observations are presented for the heavily reddened star cluster Melotte 105, resulting in colour-magnitude diagrams and spectral class estimates. There is considerable lack of agreement between studies for reddening, age and distance for this cluster explaining why the archival data are being made available by this...

Sivaram, C Arun, Kenath Rebecca, Louise
Published in
Journal of Astrophysics and Astronomy

In view of the negative results from various dark matter detection experiments, we propose alternate models by postulating a minimal field strength (minimal curvature) and also a minimal acceleration. These postulates lead to modified Newtonian dynamics, modified Newtonian gravity, and modified relativistic gravity. Through these postulates, we sho...

Timoshenko, G. N. Gordeev, I. S.
Published in
Journal of Astrophysics and Astronomy

A simulation of the radiation field inside a habitable module (a diameter of 6 m and length of 12 m) of a spacecraft generated by isotropic Galactic Cosmic Radiation (GCR) in deep interplanetary space is carried out for minimum and maximum solar activity using the FLUKA code. Protons, alpha-particles, deuterons, 3\documentclass[12pt]{minimal} \usep...

Bruevich, E. A.
Published in
Journal of Astrophysics and Astronomy

Solar flare activity is characterized by different classification systems, both in optical and X-ray ranges. The most generally accepted classifications of solar flares describe important parameters of flares such as the maximum of brightness of the flare in the optical range – Hα\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysy...