Published in Astrophysics and Space Science
This contribution is aimed at an analysis of the dynamics of free-electron density fluctuations in the ionospheric critical plasma frequency f0F2 by using some tools from the theory of nonlinear dynamical systems. The results suggest the existence of low-dimensional attractors that point to a characterization of the free electron density fluctuatio...
Published in Astrophysics and Space Science
We investigate the precessing and periodic orbits of timelike particles around a self-complete and Generalized-Uncertainty-Principle (GUP) black hole. After its marginally bound orbit and innermost stable circular orbit are found, we obtain the allowable conditions for the bound orbits. The relativistic periastron advance is worked out, and thereby...
Published in Astrophysics and Space Science
A family of unidentified infrared emission (UIE) bands has been observed throughout the Universe. The current observed spectral properties of the UIE bands are summarized. These properties are discussed in the frameworks of different models of the chemical carriers of these bands. The UIE carriers represent a large reservoir of carbon in the Univer...
Published in Astrophysics and Space Science
We report a model study on the effects of clouds on emission spectra of super-Venus planets. Our goal is to assess possible ways to identify characteristic spectral features due to clouds. We show that it is possible to distinguish an impact of H2SO4 clouds on the CO2 absorption band at 4.8 μm for temperature profiles with and without a thermal inv...
Published in Astrophysics and Space Science
Published in Astrophysics and Space Science
We are concerned with the spatial twisted central configuration formed by two paralleled regular N\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$N$\end{document}-polygo...
Published in Astrophysics and Space Science
This report describes a study involving the design and optimization of Earth-Mars transfer trajectories with launch constraints by taking the Chinese Mars mission Tianwen-1 as a typical case. The trajectory characteristics of the mission are investigated, and the results indicate that the launch and transfer trajectories do not match at the injecti...
Published in Astrophysics and Space Science
The concept of evolutionary sequence of jetted active galactic nuclei (AGNs) has been challenged in the last few decades since AGN subclasses are considered to be different due to their viewing angle. In this paper, we collected a sample of 1108 blazars (472 flat-spectrum radio quasars, FSRQs and 636 BL Lacertae objects, BL Lacs) and 120 Seyfert ga...
Published in Astrophysics and Space Science
We study the development of strong geomagnetic storms due to coronal mass ejections in near-Earth space. We compare the time evolution of geomagnetic disturbances with the time variation of solar wind plasma and field parameters with special attention to the development of the main-phase of the geomagnetic storms. We use geomagnetic indices and sol...
Published in Astrophysics and Space Science
Electron pitch angle diffusion coefficients for resonant interaction with electrostatic electron cyclotron harmonic (ECH) waves have been calculated. Calculations have been performed at five values of the ratio of electron plasma frequency to gyro-frequency (2.0, 4.77, 8.0, 12.0, and 18.0), thirteen values of electron energy between 1 eV and 10 keV...
