Research Article
Effect of Magnetic Field on Particle Emission from the Surface of Neutron Star
Issue:
Volume 12, Issue 2, June 2025
Pages:
28-39
Received:
21 April 2025
Accepted:
10 May 2025
Published:
21 June 2025
DOI:
10.11648/j.ajaa.20251202.11
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Abstract: Studying the effect of magnetic fields on particle emission from the surface of neutron stars is vital for advancing our understanding of neutron star physics and high-energy astrophysical processes. One of the main topics in pulsar magnetospheric physics is the particle emission from neutron stars surface. This study investigates the role of multipolar magnetic fields in neutron star (NS) emission physics by incorporating higher-order field components into the standard dipole model. While past studies have primarily relied on a dipolar field configuration, recent observations suggest the presence of multipole components that significantly influence emission processes. Our findings show that higher-order multipole magnetic fields shape localized particle emission regions near the NS surface, while the dipole field dominates at larger distances. By considering the NS’s crust and superfluid core structure, as well as the effects of rapid rotation, we refine the understanding of magnetic field topologies and their impact on radiation mechanisms. This study highlights the necessity of incorporating multipolar magnetic fields for accurate modeling of pulsar and magnetar emissions. By investigating these effects, particularly the role of multipolar magnetic field components, researchers can refine theoretical models of emission mechanisms that go beyond the classical dipole framework. This has significant implications for interpreting observations of pulsars and magnetars, whose emission patterns, spectral features, and temporal variability often demand more complex field geometries. Furthermore, understanding particle emission driven by magnetic fields offers insight into neutron star spin-down evolution, magnetic field decay, and energy loss processes. Future work will involve detailed numerical simulations incorporating general relativistic effects and magnetosphere-plasma interactions.
Abstract: Studying the effect of magnetic fields on particle emission from the surface of neutron stars is vital for advancing our understanding of neutron star physics and high-energy astrophysical processes. One of the main topics in pulsar magnetospheric physics is the particle emission from neutron stars surface. This study investigates the role of multi...
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Research Article
Magnetic Dipole and Quadruple Interaction Fields of White Dwarf Stars
Diriba Gonfa Tolasa*
Issue:
Volume 12, Issue 2, June 2025
Pages:
40-49
Received:
6 February 2025
Accepted:
9 May 2025
Published:
30 June 2025
DOI:
10.11648/j.ajaa.20251202.12
Downloads:
Views:
Abstract: White dwarf stars, the remnants of low to medium-mass stars, represent a crucial phase in stellar evolution, characterized by their dense cores and unique magnetic properties. This study investigates the magnetic dipole and quadruple interaction fields of white dwarf stars, offering insights into their structure, behavior, and the underlying physical processes governing their magnetic phenomena. Utilizing a combination of observational data from contemporary astrophysical surveys and advanced numerical simulations, we present a comprehensive analysis of the magnetic fields associated with these stellar remnants. The magnetic dipole fields, generated by the stellar core's rotation and convection processes, exhibit a complex interplay with the quadruple fields arising from asymmetries in mass distribution. Our findings reveal that the strength and orientation of magnetic dipole fields can significantly influence the thermal and dynamical stability of white dwarfs, affecting their cooling rates and evolutionary paths. In our examination of the quadruple fields, we uncover their crucial role in shaping the magnetic landscape of these stars. Unlike dipole fields, which are relatively uniform, quadruple fields introduce significant spatial variations, leading to localized hotspots of magnetic activity. This interaction results in unique phenomena, including enhanced mass loss rates and the potential for magnetic braking, which may alter the stars' rotational dynamics over time. Moreover, we explore the implications of these magnetic interactions on the observed phenomena in white dwarfs, such as pulsations, variability in luminosity, and potential connections to type Ia supernova progenitors. By integrating theoretical models with empirical data, we establish a framework for understanding how magnetic fields influence the fate of white dwarf stars. This research not only enhances our understanding of the magnetic properties of white dwarfs but also contributes to broader astrophysical theories regarding stellar evolution and the lifecycle of stars. The results emphasize the necessity of considering both dipole and quadruple interactions in future studies, paving the way for a more nuanced exploration of the magnetic characteristics of stellar remnants.
Abstract: White dwarf stars, the remnants of low to medium-mass stars, represent a crucial phase in stellar evolution, characterized by their dense cores and unique magnetic properties. This study investigates the magnetic dipole and quadruple interaction fields of white dwarf stars, offering insights into their structure, behavior, and the underlying physic...
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