Iranian Journal of Astronomy and Astrophysics

ارسال های اخیر

  • Investigation of the Effect of Density Gradients in Fuel Pellets on Filamentation Electromagnetic Instability during Beam-Plasma Interactions in Inertial Confinement Fusion 

    Mahdavi, Mohammad؛ Bizhani, Zeinab؛ Khanzadeh, Hengameh (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2025-01-01)
    The transfer of a beam of high-energy particles, such as electrons, to the center of a fuel pellet is a significant aspect of plasma fusion processes. When the beam is directed toward the center of the fuel pellet, a ...

  • Magnetic Braking of the Rotational Molecular Cloud Cores, Revisited 

    Ebrahimi, Abbas؛ Nejad-Asghar, Mohsen (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2025-01-01)
    The phenomenon of magnetic braking is one of the significant physical effects of the magnetic field in rotating molecular clouds. Here, we revisit the work of Nakano (1989). In addition to receiving his results, we investigate ...

  • Observational Status of Zero-Point Length Cosmic Inflation 

    Pourmohseni, Elahe؛ Nozari, Kourosh؛ Nassiri-Rad, Amin (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2025-01-01)
    We examine observational status of cosmological inflation with a zero-point length. By considering the zero-point length correction to the geometric part of the field equations, specially the Hubble parameter, we derive ...

  • On the Generation and Dissipation of Magnetic Energy During a Shear-Flow Driven Instability in Space Plasmas 

    Hosseinpour, Mahboub (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2025-01-01)
    A well-known shear flow-driven instability, namely the Kelvin‐Helmholtz instability (KHI), establishes important changes in the macroscopic dynamics of some space magnetized plasmas such as the solar corona, astrophysical ...

  • Dark Energy Evolution: Non-Interacting and Interacting Cases 

    Noori Gashti, Saeed؛ Alipour, Mohammad Reza؛ Afshar, Mohammad Ali S.؛ Sadeghi, Jafar (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2025-01-01)
    In this paper, we study dark energy from two different perspectives, challenging a two-field scenario in two forms: non-interacting and interacting. We investigate the evolution of dark energy in a Friedmann-Robertson-Walker ...

  • The Study of Auto-Correlation Function on Lyman Alpha Forest of QSOs 

    Rezaee Darestanee, Sara؛ Pazhouhesh, Reza؛ Aghaee, Alireza (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-12-01)
    he Lyman Alpha forest is one of the most powerful cosmological tools for studying large-scale structures of the universe. The flux autocorrelation function for Lyman alpha forest is used to study the clustering of structures. ...

  • Investigating the Sensitivity of Alfvén Pulse Interactions to Plasma Beta in the Corona 

    Karimi, Naser؛ Alizadeh, Mahdi؛ Shajei, Zianab (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-12-01)
    Two competing theories, the wave theory and reconnection theory, provide explanations for solar corona heating, supported by observations of wave phenomena and magnetic reconnection on the Sun. Plasma β, the ratio of thermal ...

  • Vacuum Stress between Conducting Plates for Neuman Conditions 

    Nazari, Borzoo (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-12-01)
    In [1], we have found that the curved spacetime version of the vacuum stress between conducting plates was first done in flat spacetime by Brown and Maclay. Here, we calculate the energy-momentum tensor for the Casimir ...

  • Electromagnetic Instability in Plasma with Kappa Distribution Function in the Presence of Coulomb Collision 

    Nejadtaghi, Fatemeh؛ Mahdavi, Mohammad؛ Hassan pour, Saeed؛ Khanzadeh, Hengameh؛ Tavassoli, Ali (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-12-01)
    In this research, an analytical expression of the Weibel electromagnetic instability growth rate is investigated for strongly coupled plasma in the presence of Coulomb collisions in the beam-plasma interaction under a ...

  • Chameleon Screening and Fifth Force in Globular Clusters I: King Model 

    Mousavi, Mohadese؛ Mirtorabi, Mohammad Taghi؛ Azizi, Tahereh (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-12-01)
    Those globular clusters that are located in the halo of galaxy experience a weak gravitational force due to their great distance from the center of their host galaxy, so they are characterized by extremely low gravitational ...

  • Directional Dependence of the Angular Resolution of a Radio Antenna Array due to the Earth’s Magnetic Field 

    Pezeshkian, Yousef؛ Omidifar, Shiva؛ Bahmanabadi, Mahmud (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-12-01)
    Recent years have seen a growing interest in radio detection of Cosmic Rays. We investigated the incident direction of Cosmic Rays for an array of 11 radio antennas through a series of simulations using the CoREAS toolkit. ...

  • Variable Mass of the Test Particle in the Collinear 4-Body System with Triaxial Primaries 

    Abdullah, Abdullah؛ Kellil, Rabah (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-07-01)
    The mass variation effect of the test particle is studied in the collinear restricted four-body configuration with the assumption that the shapes of the three primary bodies are triaxial. It is assumed that these three ...

  • A Study on the Lateral Distribution of Cherenkov Radiation of Extensive Air Showers at High Observation Levels 

    Purmohammad, Davoud (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-07-01)
    By using CORSIKA code, for simulation of extensive air showers for observation levels at different altitudes, the variation of the lateral distribution of Cherenkov radiation of showers with altitude is studied. The lateral ...

  • Behavior of Magnetohydrodynamic Waves in the Viscous Coronal Loops 

    Rezaei, Roza؛ Fazel, Zahra (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-07-01)
    Studying the dynamics of magnetic plasmas in the presence of pressure gradients, gravity, and Lorentz forces is essential for understanding wave generation and propagation in the solar atmosphere and other magnetic ...

  • Unveiling the Universe: Tsallis Holographic Dark Energy and Modified Logarithmic f(R) Gravity 

    Baziar, Fatemeh؛ Sadeghi, Jafar (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-07-01)
    In this paper, we delve into the intricacies of the Tsallis holographic dark energy model within the framework of a modified logarithmic f(R) gravity. This gravity model is distinctive due to its composition, which includes ...

  • Complex Network in Solar Features 

    Taran, Somayeh (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-07-01)
    This paper is an overview of studying the solar features in a complex network approach. First, we introduce the structural features of complex networks and important network parameters. Applying the detrended fluctuation ...

  • The Cigar-Shaped Background Metric with Supersymmetry Approaches and Thermal Properties of System 

    Jalili, Omid؛ Toni, Shahin؛ Sadeghi, Jafar (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-03-01)
    In this paper, we introduce the cigar- shaped metric . Such metric can be obtained by the Schwarzschild black hole. Here, we write the Dirac equation in the corresponding background. We take some change of variable for the ...

  • Luminosity Distance Reconstruction using an Ensemble of Neural Networks 

    Mohammadi, Mohammad Hadi؛ Mehrabi, Ahmad (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-07-01)
    Exploring the consistency of a dataset with the $\Lambda$CDM model across low and high redshifts stands as a compelling topic in cosmology. Given the capability of neural networks to reconstruct an unknown function, we ...

  • Spatial Variations in the Characteristics of Oscillated and Non-Oscillated Solar Bright Points in Active Regions and Coronal Holes 

    Sadeghi, Rayhane؛ Tavabi, Ehsan (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-03-01)
    In this study, researchers investigated the properties of oscillated and non-oscillated bright points (BPs) in different regions of the Sun, including active regions (ARs) and coronal holes (CHs). The findings revealed ...

  • Space Climate and Solar Energetic Particles 

    Tavabi, Ehsan؛ Zeighami, Sima؛ Kharaghani, Yones (Damghan University Astronomical Society of Iranدانشگاه دامغان, 2024-03-01)
    In this paper, we investigate the effect of solar corona magnetic activities during 11-year periods and energetic particles on global warming. According to atmospheric changes during the past years, the relationship between ...

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