MOhammed H. Talafha

@sharjah.ac.ae

Research Institute for Science and Engineering
University of Sharjah

MOhammed H. Talafha


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https://researchid.co/mtalafha901

RESEARCH, TEACHING, or OTHER INTERESTS

Astronomy and Astrophysics, Atmospheric Science, Artificial Intelligence, Computational Mathematics
9

Scopus Publications

94

Scholar Citations

4

Scholar h-index

3

Scholar i10-index

Scopus Publications

  • Abundance Calculations of Neon Isotopes in the Predicted Lifetime of the Sun
    Jordan Journal of Physics, 2026
  • Modelling the Solar Cycle Nonlinearities into the Algebraic Approach
    Mohammed H. Talafha
    Solar Physics, 2025
  • Effect of Nonlinear Surface Inflows into Activity Belts on Solar Cycle Modulation
    Mohammed H. Talafha, Kristóf Petrovay, Andrea Opitz
    Solar Physics, 2025
    Converging flows are visible around bipolar magnetic regions (BMRs) on the solar surface, according to observations. Average flows are created by these inflows combined, and the strength of these flows depends on the amount of flux present during the solar cycle. In models of the solar cycle, this average flow can be depicted as perturbations to the meridional flow. In this article, we study the effects of introducing surface inflow to the surface flux transport models (SFT) as a possible nonlinear mechanism in the presence of latitude quenching for an inflow profile whose amplitude varies within a cycle depending on the magnetic activity. Using a grid based on one-dimensional SFT models, we methodically investigate the extent of the nonlinearity caused by inflows, latitude quenching (LQ), and their combinations. The results show that including surface inflows in the model in the presence of both LQ and tilt quenching (TQ) produced a polar field within a $\\pm 1\\sigma $ ± 1 σ of an average cycle polar field ( $\\sigma $ σ is the standard deviation) with a correlation coefficient of 0.85. We confirm that including inflows produces a lower net contribution to the dipole moment (10 – 25%). Furthermore, the relative importance of LQ vs. inflows is inversely correlated with the dynamo effectivity range ( $\\lambda _{R}$ λ R ). With no decay term, introducing inflows into the model results in a less significant net contribution to the dipole moment. Including inflows in the SFT model shows a possible nonlinear relationship between the surface inflows and the solar dipole moment, suggesting a potential nonlinear mechanism contributing to the saturation of the global dynamo. For lower $\\lambda _{R}$ λ R ( $\\lessapprox 10^{\\circ }$ ⪅ 10 ∘ ), TQ always dominates LQ, and for higher $\\lambda _{R}$ λ R , LQ dominates. However, including inflows makes the domination earlier in case of having a decay term in the model.
  • Advancements in Astronomy and Space Sciences in Jordan: Contributions from Experts and Astrophysical Institutions
    A. A. Abushattal, Ala’a A. A. Azzam, Mashhoor A. Al-Wardat, Hatem Widyan, Mohammad Mardini, et al.
    Springer Proceedings in Physics, 2025
    Humanity has always been fascinated by astronomy and space sciences. Two distinct groups of Jordanians show interest in this subject: specialists and amateurs. Experts, often academicians and researchers, immerse themselves in the scientific mysteries of the universe, contributing to global knowledge. Their tools, telescopes, and methodologies are advanced, and they often collaborate with international institutions and agencies. Meanwhile, amateurs contribute significantly to popularising astronomy by driving passion and curiosity. Sometimes they make significant discoveries while stargazing, tracking meteors, or performing basic observational activities. The enthusiasm and grassroots approach of these individuals are essential for fostering a love for the cosmos and disseminating knowledge among the younger generation, even without the advanced tools of specialists. This synergy has led to a vibrant astronomical community in Jordan, where both groups complement each other’s efforts to understand and appreciate the universe’s vastness. Through specialized lenses such as research focuses and published academic studies, this seminal study explores the evolution of astronomy in Jordan. Space science and astronomy experts from both within and outside the country are examined in this work. Furthermore, this study highlights the key role played in various facets of this development, including observational procedures, recreational astronomical endeavors, community involvement in these activities, and a critical discussion of the challenges facing astronomy in Jordan.
  • The statistical properties of 28 IR-bright dust-obscured galaxies and SED modelling using CIGALE
    Nofoz Suleiman, Akatoki Noboriguchi, Yoshiki Toba, Lajos G Balázs, Denis Burgarella, et al.
    Publications of the Astronomical Society of Japan, 2022
    The aim of this study is to characterize the physical and statistical properties of a sample of infrared-bright dust-obscured galaxies (DOGs) by fitting their spectral energy distributions (SEDs). We examined 28 DOGs at redshifts 0.47 ≤ z ≤ 1.63 discovered by combining images of the Subaru Hyper Suprime-Cam (HSC) survey, the VISTA Kilo-degree Infrared Galaxy (VIKING) survey, and the Wide-field Infrared Survey Explorer (WISE) all-sky survey, and detected at Herschel Spectral and Photometric Imaging Receiver (SPIRE) bands. We have detected a significant active galactic nucleus (AGN) contribution to the mid-infrared luminosity for $71\\%$ of DOGs. Our DOGs contain several types of AGNs; the majority of AGN emission originates from Type 2 AGNs. Our DOG sample shows very high values of stellar mass [log (M*/M${}_\\odot $) = 11.49 ± 1.61] compared with other samples of DOGs selected at infrared wavelengths. Our study is promising to identify a new type of DOGs called “overweight” DOGs (ODOGs). ODOGs may indicate the end of the DOG phase, and then they become visible quasars. Principal component (PC) analysis is applied to reduce the number of dimensions of our sample, removing the dependency on the observed variables. There are two significant PCs describing $72.7\\%$ of the total variance. The first PC strongly correlates with redshift, dust luminosity, dust mass, and stellar mass, while far-ultraviolet (FUV) attenuation strongly correlates with the second PC, which is orthogonal to the first one. The partial correlation between the resulted physical parameters is tested, supporting the reliability of the correlations.
  • Role of observable nonlinearities in solar cycle modulation
    M. Talafha, M. Nagy, A. Lemerle, K. Petrovay
    Astronomy and Astrophysics, 2022
    Context. Two candidate mechanisms have recently been considered with regard to the nonlinear modulation of solar cycle amplitudes. Tilt quenching (TQ) comprises the negative feedback between the cycle amplitude and the mean tilt angle of bipolar active regions relative to the azimuthal direction. Latitude quenching (LQ) consists of a positive correlation between the cycle amplitude and average emergence latitude of active regions. Aims. Here, we explore the relative importance and the determining factors behind the LQ and TQ effects. Methods. We systematically probed the degree of nonlinearity induced by TQ and LQ, as well as a combination of both using a grid based on surface flux transport (SFT) models. The roles played by TQ and LQ are also explored in the successful 2×2D dynamo model, which has been optimized to reproduce the statistical behaviour of real solar cycles. Results. The relative importance of LQ versus TQ is found to correlate with the ratio u0/η in the SFT model grid, where u0 is the meridional flow amplitude and η is the diffusivity. An analytical interpretation of this result is given, further demonstrating that the main underlying parameter is the dynamo effectivity range, λR, which is, in turn, determined by the ratio of equatorial flow divergence to diffusivity. The relative importance of LQ versus TQ is shown to scale as $ C_1+C_2/\\lambda_R^2 $. The presence of a latitude quenching effect is seen in the 2×2D dynamo, contributing to the nonlinear modulation by an amount that is comparable to TQ. For other dynamo and SFT models considered in the literature, the contribution of LQ to the modulation covers a broad range – from entirely insignificant to serving as a dominant source of feedback. On the other hand, the contribution of a TQ effect (with the usually assumed amplitude) is never shown to be negligible.
  • Optimization of surface flux transport models for the solar polar magnetic field
    K. Petrovay, M. Talafha
    Astronomy and Astrophysics, 2019
    Context. The choice of free parameters in surface flux transport (SFT) models describing the evolution of the large-scale poloidal magnetic field of the Sun is critical for the correct reproduction of the polar magnetic flux built up during a solar cycle, which is known to be a good predictor of the amplitude of the upcoming cycle. Aims. For an informed choice of parameters it is important to understand the effects of and interplay among the various parameters and to optimize the models for the polar magnetic field. Methods. Here we present the results of a large-scale systematic study of the parameter space in an SFT model where the source term representing the net effect of tilted flux emergence was chosen to represent a typical, average solar cycle as described by observations. Results. Comparing the results with observational constraints on the spatiotemporal variation of the polar magnetic field, as seen in magnetograms for the last four solar cycles, we mark allowed and excluded regions in the 3D parameter space defined by the flow amplitude u0, the magnetic diffusivity η and the decay time scale τ, for three different assumed meridional flow profiles. Conclusions. Without a significant decay term in the SFT equation (i.e., for τ > 10 yr) the global dipole moment reverses too late in the cycle for all flow profiles and parameters, providing independent supporting evidence for the need of a decay term, even in the case of identical cycles. An allowed domain is found to exist for τ values in the 5–10 yr range for all flow profiles considered. Generally higher values of η (500–800 km2 s−1) are preferred though some solutions with lower η are still allowed.
  • SYMBOLS AND ASTROLOGICAL TERMS IN ANCIENT ARABIC INSCRIPTIONS
    Scientific Culture, 2019
  • A Study of the Abundance of Low-Z Elements in the Sun During its Whole Predicted Life
    M. H. Talafha, M. A. Al-Wardat, N. M. Ershaidat
    Astrophysical Bulletin, 2018

RECENT SCHOLAR PUBLICATIONS

  • Investigating Nonlinear Quenching Effects on Polar Field Buildup in the Sun Using Physics-informed Neural Networks
    JJ Athalathil, MH Talafha, B Vaidya
    The Astrophysical Journal 1000 (1), 79 , 2026
    2026
  • Abundance Calculations of Neon Isotopes in the Predicted Lifetime of the Sun
    MA Alkhajeh, MA Al-Wardat, AM Kasawneh, MH Talafha
    Jordan Journal of Physics 19 (1), 97-109 , 2026
    2026
  • Modelling the Solar Cycle Nonlinearities into the Algebraic Approach
    MH Talafha
    Solar Physics 300 (157), 1-21 , 2025
    2025
    Citations: 1
  • Advancements in Astronomy and Space Sciences in Jordan: Contributions from Experts and Astrophysical Institutions
    AA Abushattal, AA Azzam, MA Al-Wardat, H Widyan, M Mardini, A Taani, ...
    Proceedings of the 14th Arabic Conference of the Arab Union for Astronomy … , 2025
    2025
    Citations: 3
  • Effect of Nonlinear Surface Inflows into Activity Belts on Solar Cycle Modulation
    MH Talafha, K Petrovay, A Opitz
    Solar Physics Journal 300 (57) , 2025
    2025
    Citations: 4
  • Surface Inflows Toward Active Regions in Solar Dynamo Models
    MH Talafha
    2025
  • Nonlinearites and stochastic perturbations in dynamo models
    MH Talafha
    Eötvös Loránd University , 2023
    2023
  • The statistical properties of 28 IR-bright dust-obscured galaxies and SED modelling using CIGALE
    N Suleiman, A Noboriguchi, Y Toba, LG Balázs, D Burgarella, T Kovács, ...
    Publications of the Astronomical Society of Japan 74 (5), 1157-1185 , 2022
    2022
    Citations: 18
  • Role of observable nonlinearities in solar cycle modulation
    MH Talafha, M Nagy, A Lemerle, K Petrovay
    Astronomy & Astrophysics 660, A92 , 2022
    2022
    Citations: 30
  • Optimization of surface flux transport models for the solar polar magnetic field
    KPMH Talafha
    Astronomy and Astrophysics 632, A87 , 2019
    2019
    Citations: 27
  • Symbols and astrological terms in ancient arabic inscriptions
    MH Talafha, ZA Talafha
    https://sci-cult.com/symbols-and-astrological-terms-in-ancient-arabic … , 2019
    2019
    Citations: 3
  • A study of the abundance of low-z elements in the sun during its whole predicted life
    MH Talafha, MA Al-Wardat, NM Ershaidat
    Astrophysical Bulletin 73, 235-240 , 2018
    2018
    Citations: 8
  • AN OPEN SOURCE PACKAGE FOR THE STUDY OF ABUNDANCE OF ELEMENTS IN STARS
    MH Talafha
    Yarmouk University , 2016
    2016

MOST CITED SCHOLAR PUBLICATIONS

  • Role of observable nonlinearities in solar cycle modulation
    MH Talafha, M Nagy, A Lemerle, K Petrovay
    Astronomy & Astrophysics 660, A92 , 2022
    2022
    Citations: 30
  • Optimization of surface flux transport models for the solar polar magnetic field
    KPMH Talafha
    Astronomy and Astrophysics 632, A87 , 2019
    2019
    Citations: 27
  • The statistical properties of 28 IR-bright dust-obscured galaxies and SED modelling using CIGALE
    N Suleiman, A Noboriguchi, Y Toba, LG Balázs, D Burgarella, T Kovács, ...
    Publications of the Astronomical Society of Japan 74 (5), 1157-1185 , 2022
    2022
    Citations: 18
  • A study of the abundance of low-z elements in the sun during its whole predicted life
    MH Talafha, MA Al-Wardat, NM Ershaidat
    Astrophysical Bulletin 73, 235-240 , 2018
    2018
    Citations: 8
  • Effect of Nonlinear Surface Inflows into Activity Belts on Solar Cycle Modulation
    MH Talafha, K Petrovay, A Opitz
    Solar Physics Journal 300 (57) , 2025
    2025
    Citations: 4
  • Advancements in Astronomy and Space Sciences in Jordan: Contributions from Experts and Astrophysical Institutions
    AA Abushattal, AA Azzam, MA Al-Wardat, H Widyan, M Mardini, A Taani, ...
    Proceedings of the 14th Arabic Conference of the Arab Union for Astronomy … , 2025
    2025
    Citations: 3
  • Symbols and astrological terms in ancient arabic inscriptions
    MH Talafha, ZA Talafha
    https://sci-cult.com/symbols-and-astrological-terms-in-ancient-arabic … , 2019
    2019
    Citations: 3
  • Modelling the Solar Cycle Nonlinearities into the Algebraic Approach
    MH Talafha
    Solar Physics 300 (157), 1-21 , 2025
    2025
    Citations: 1
  • Investigating Nonlinear Quenching Effects on Polar Field Buildup in the Sun Using Physics-informed Neural Networks
    JJ Athalathil, MH Talafha, B Vaidya
    The Astrophysical Journal 1000 (1), 79 , 2026
    2026
  • Abundance Calculations of Neon Isotopes in the Predicted Lifetime of the Sun
    MA Alkhajeh, MA Al-Wardat, AM Kasawneh, MH Talafha
    Jordan Journal of Physics 19 (1), 97-109 , 2026
    2026
  • Surface Inflows Toward Active Regions in Solar Dynamo Models
    MH Talafha
    2025
  • Nonlinearites and stochastic perturbations in dynamo models
    MH Talafha
    Eötvös Loránd University , 2023
    2023
  • AN OPEN SOURCE PACKAGE FOR THE STUDY OF ABUNDANCE OF ELEMENTS IN STARS
    MH Talafha
    Yarmouk University , 2016
    2016