About
19
Publications
3,142
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
219
Citations
Introduction
Current institution
Publications
Publications (19)
![The panels show the travel-time shift δt\documentclass[12pt]{minimal}...](publication/388926296/figure/fig1/AS:11431281314314482@1741316630926/The-panels-show-the-travel-time-shift-dtdocumentclass12ptminimal_Q320.jpg)
![The left panel shows the plot of δt\documentclass[12pt]{minimal}...](publication/388926296/figure/fig5/AS:11431281314294245@1741316631559/The-left-panel-shows-the-plot-of-dtdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
In this paper, we study the wave travel-time shift signature of two distinct magnetic models of sunspots, namely a monolithic model of varying sizes and a cluster (or spaghetti) model of different configurations (compact and loose) and sizes. To this end, we use numerical simulations to propagate an \documentclass[12pt]{minimal} \usepackage{amsmath...
This paper investigates the impact of a powerful gamma ray burst (GRB) that occurred on 9 October 2022, on the Earth's environment using a very low frequency receiver (VLF) to probe the lower ionospheric region (the D region). In addition to the VLF data analysis, we employ numerical simulation through the Long Wavelength Propagation Capability cod...
This paper investigates the impact of a powerful gamma ray burst (GRB) that occurred on 9 October 2022, on the Earth's environment using a very low frequency receiver (VLF) to probe the lower ionospheric region (the D region). In addition to the VLF data analysis, we employ numerical simulation through the Long Wavelength Propagation Capability cod...
We study the non-linear interaction of three parallel Alfv\'en wave packets (AWP) in an initially uniform plasma using 2.5D particle-in-a-cell (PIC) numerical simulations. We aim to help to explain the observation of suprathermal electrons by multiple Alfv\'en waves collision in regions where these waves are trapped like IAR (Ionospheric Alfv\'en R...
We study the nonlinear interaction of three parallel Alfvén wave packets (AWPs) in an initially uniform plasma using 2.5-dimensional particle-in-cell (PIC) numerical simulations. We aim to help to explain the observation of suprathermal electrons by the collision of multiple Alfvén waves in regions where these waves are trapped like the IAR (Ionosp...
Context: Until recently, camera networks designed for monitoring
fireballs worldwide were not fully automated, implying that
in case of a meteorite fall, the recovery campaign was rarely immediate. This was an important limiting factor as the most fragile
- hence precious - meteorites must be recovered rapidly to avoid
their alteration.
Aims: To o...
Context. Until recently, camera networks designed for monitoring fireballs worldwide were not fully automated, implying that in case of a meteorite fall, the recovery campaign was rarely immediate. This was an important limiting factor as the most fragile – hence precious – meteorites must be recovered rapidly to avoid their alteration.
Aims. The F...
We use 2.5-D electromagnetic particle-in-cell simulation code to investigate the acceleration of electrons in solar coronal holes through the interaction of Alfv\'en waves with an interplume region. The interplume is modeled by a cavity density gradients that are perpendicular to the background magnetic field. The aim is to contribute to explain th...
We use the 2.5-D electromagnetic particle-in-cell simulation code to investigate the acceleration of electrons in solar coronal holes through the interaction of Alfvén waves with an interplume region. The interplume is modeled by cavity density gradients that are perpendicular to the background magnetic field. The aim is to help explain the observa...
We use numerical simulations to investigate the interaction of an f-mode wave packet with small and large models of a sunspot in a stratified atmosphere. While a loose cluster model has been
largely studied before, we focus in this study on the scattering from an ensemble of tightly compact tubes. We showed that
the small compact cluster produces a...
We use numerical simulations to investigate the interaction of an $f$-mode wave packet with small and large models of a sunspot in a stratified atmosphere. While a loose cluster model has been largely studied before, we focus in this study on the scattering from an ensemble of tightly compact tubes. We showed that the small compact cluster produces...
Motivated by the problem of local solar subsurface magnetic structure, we
have used numerical simulation to investigate the propagation of waves through
monolithic magnetic flux tubes of different size. A cluster model can be a good
approximation to simulate sunspots as well as solar plage regions which are
composed of an ensemble of compactly pack...
Motivated by the question of how to distinguish seismically between
monolithic and cluster models of sunspots, we have simulated the propagation of
an $f$-mode wave packet through two identical small magnetic flux tubes (R=200
km), embedded in a stratified atmosphere. We want to study the effect of
separation $d$ and incidence angle $\chi$ on the s...
We investigate the process of acceleration of electrons in the solar
corona by the propagation of EMIC waves along a density cavity with
density gradients perpendicular to the background magnetic field. We use
2.5-D electromagnetic particle-in-cell simulation code. Simulations show
that EMIC waves in interaction with a cavity give rise to a strong...
Three-dimensional numerical simulations have been used to study the scattering of a surface-gravity wave packet by vertical magnetic flux tubes, with radii from 200 km to 3 Mm, embedded in stratified polytropic atmosphere. The scattered wave was found to consist primarily of m=0 (axisymmetric) and m=1 modes. It was found that the ratio of the ampli...
On September 8, 2001 around 2 h UT, the largest uranian moon, Titania, occulted Hipparcos star 106829 (alias SAO 164538, a V=7.2, K0 III star). This was the first-ever observed occultation by this satellite, a rare event as Titania subtends only 0.11 arcsec on the sky. The star's unusual brightness allowed many observers, both amateurs or professio...
On September 8, 2001 around 2 h UT, the largest uranian moon, Titania, occulted Hipparcos star 106829 (alias SAO 164538, a V = 7.2, KO III star). This was the first-ever observed occultation by this satellite. a rare event as Titania subtends only 0.11 arcsec on the sky. The star's unusual brightness allowed many observers, both amateurs or profess...
Observations suggest clearly that there is a significant interaction between solar surface waves and magnetic flux tubes with specific helioseismic signature. Magnetic flux tubes permit the propagation of two types of magnetohydrodynamic waves: The longitudinal tube wave (sausage modes) and the transversal tube wave (kink modes). The response of di...
In this paper we describe the semi-spectral linear MHD (SLiM) code which we have written to follow the interaction of linear waves through an inhomogeneous three-dimensional solar atmosphere. The background model allows almost arbitrary perturbations of density, temperature, sound speed as well as magnetic and velocity fields. We give details of se...
