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Related Concept Videos

Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Magnetic Field Lines01:19

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Shunt Admittances01:26

Shunt Admittances

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Shunt admittances play a crucial role in the analysis of transmission lines, particularly for three-phase systems with neutral conductors. When a uniformly charged conductor is positioned above the Earth, it induces an equal but opposite charge on its surface. This interaction creates electric field lines between the conductor and the Earth.
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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Updated: Sep 4, 2025

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Resolving Magnetopause Shadowing Using Multimission Measurements of Phase Space Density.

F A Staples1, A Kellerman2, K R Murphy3

  • 1Mullard Space Science Laboratory University College London London UK.

Journal of Geophysical Research. Space Physics
|July 22, 2022
PubMed
Summary
This summary is machine-generated.

Magnetopause shadowing limits radiation belt electron flux increases, even during acceleration. This study reveals direct and indirect shadowing mechanisms operating on sub-hour timescales during geomagnetic storms.

Keywords:
PSDelectron dropoutelectron lossgeomagnetic stormmagnetopause shadowingradiation belt

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Area of Science:

  • Space physics
  • Plasma physics
  • Earth science

Background:

  • Radiation belts trap energetic electrons around Earth.
  • Loss mechanisms, including atmospheric precipitation and magnetopause shadowing, control electron populations.
  • The interplay between electron acceleration and magnetopause shadowing during geomagnetic storms remains unclear.

Purpose of the Study:

  • To investigate the role of magnetopause shadowing in radiation belt electron dynamics during a geomagnetic storm.
  • To determine if magnetopause shadowing limits electron flux increases during acceleration phases.
  • To differentiate between direct and indirect shadowing mechanisms and their timescales.

Main Methods:

  • Utilized multimission phase space density calculations.
  • Analyzed electron dynamics across different storm phases (loss and acceleration).
  • Identified magnetopause shadowing features on sub-hour timescales.

Main Results:

  • Magnetopause shadowing contributes to electron loss throughout geomagnetic storms, including during net-acceleration phases.
  • Two types of shadowing were identified: direct (orbital intersection) and indirect (ULF wave transport).
  • Shadowing operates on sub-hour timescales, influencing overall radiation belt fluxes.

Conclusions:

  • Magnetopause shadowing is a significant loss process that can counteract acceleration, limiting peak electron fluxes in the radiation belts.
  • Understanding direct and indirect shadowing is crucial for accurate radiation belt modeling.
  • This study provides new insights into electron loss dynamics during geomagnetic storms.