A5060838641- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Magnetic confinement fusion research
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Seismic Waves and Analysis
- Ocean Waves and Remote Sensing
- Geophysical Methods and Applications
- Plasma Diagnostics and Applications
- Astrophysics and Star Formation Studies
- Dust and Plasma Wave Phenomena
- GNSS positioning and interference
- Astronomy and Astrophysical Research
- Oceanographic and Atmospheric Processes
- Atmospheric Ozone and Climate
- Magneto-Optical Properties and Applications
University of Tehran
2013-2021
Czech Academy of Sciences, Institute of Geophysics
2017
Tohoku University
2009-2010
Abstract We present the first analysis of Cepheid stars observed by TESS space mission in Sectors 1–5. Our sample consists 25 pulsators: ten fundamental mode, three overtone and two double-mode classical Cepheids, plus type II seven anomalous Cepheids. The targets were chosen from fields with different stellar densities, both Galactic field Magellanic System. Three have 2 minutes cadence light curves available Science Processing Operations Center: for rest, we prepared custom full-frame...
Abstract. In order to clarify the role of mode conversion process in generation mechanism LO-mode waves equatorial region plasmasphere, we have investigated linear among upper-hybrid-resonance (UHR)-mode, Z-mode and by a numerical simulation solving Maxwell's equations equation motion cold electron fluid. The wave coupling occurring magnetized plasma are examined detail. give realistic initial condition experiments, use parameters inferred from observation data obtained around Akebono...
Abstract We have investigated a linear mode conversion process among UHR-mode, Z-mode, and LO-mode waves by computer simulation solving Maxwell’s equations the motion of cold electron fluid. The characteristics wave coupling occurring in magnetized plasma were examined detail for case an inhomogeneity density lying perpendicular to ambient magnetic field. dependence efficiency on incident normal angle, frequency, background steepness gradient was studied. results show that efficient occurred...
One of the mechanisms for generating electromagnetic plasma waves (Z-mode and LO-mode) is mode conversion from electrostatic into in inhomogeneous plasma. Herein, we study a condition required propagating purely perpendicular to ambient magnetic field, by numerically solving full dispersion relation. An approximate model derived describing coupling between (hot Bernstein mode) Z-mode at upper hybrid frequency. The used conditions (electrostatic electron cyclotron harmonic waves, including...
Abstract The energetic charged particles penetration in the plasmasphere are carried out using updated version of 3D Stanford PIC code. We considered slow and fast wind streams to know (electrons ions) having different velocities into four regions i.e. cusp, plasmasphere, sunward, tailward sides. It is observed that ion penetrations higher than electrons for solar while it reverse streams. Also, results show percentage (both same cusp subsolar point reconnection region. speed streams; so...
Abstract The mode conversion process responsible for radio wave generation has been studied several decades; however, the properties of condition required an efficient are still unknown. aim this study is to determine value plasma frequency from slow Z -mode left-hand ordinary (LO)-mode waves in matching cases, where two branches dispersion relation modes perfectly connected. We derive relations electromagnetic propagation inhomogeneous considering Snell’s law and investigated them detail....
Interactions of charge particles with electromagnetic waves have important effects (linear and nonlinear) on the propagation waves, it can somewhat play a role in generation new mode waves. Besides, particle energies an causing instability plasma. The values parallel energy been calculated so that they satisfy nonlinear coupling condition. Furthermore, result for is presented initial parameters inferred from observational data are used. results show (particle-wave interaction) be candidate...