Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Energy In A Magnetic Field01:24

Energy In A Magnetic Field

2.3K
If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
2.3K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

700
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
700
Magnetic Damping01:17

Magnetic Damping

521
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
521
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

338
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...
338
Conservation of Energy in Control Volume01:14

Conservation of Energy in Control Volume

894
Consider a turbine operating under steady-flow conditions. The control volume is drawn around the turbine, with fluid entering at one point and exiting at another. The turbine extracts energy from the fluid, which performs mechanical work (shaft work).
For steady flow systems, the time derivative of the stored energy becomes zero since there is no energy accumulation within the control volume. This simplifies the energy equation to:
894
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.1K
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...
1.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Anomalous transient enhancement of planetary ion escape at Mars.

Nature communications·2025
Same author

Machine-learning heat flux closure for multi-moment fluid modeling of nonlinear Landau damping.

Proceedings of the National Academy of Sciences of the United States of America·2025
Same author

Two distinct current systems in the ionosphere of Mars.

Nature communications·2024
Same author

Detection of magnetospheric ion drift patterns at Mars.

Nature communications·2023
Same author

Inner southern magnetosphere observation of Mercury via SERENA ion sensors in BepiColombo mission.

Nature communications·2022
Same author

Nitrogen Fixation at Early Mars.

Astrobiology·2021

Related Experiment Video

Updated: Aug 18, 2025

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

9.2K

Reconnection-driven energy cascade in magnetohydrodynamic turbulence.

Chuanfei Dong1,2, Liang Wang1,2, Yi-Min Huang1,2

  • 1Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08540, USA.

Science Advances
|December 8, 2022
PubMed
Summary

Magnetohydrodynamic turbulence in the solar atmosphere is altered by magnetic reconnection. This process forms plasmoids, creating a new energy cascade that impacts solar coronal heating.

More Related Videos

Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

9.6K
Ultrasound Velocity Measurement in a Liquid Metal Electrode
08:41

Ultrasound Velocity Measurement in a Liquid Metal Electrode

Published on: August 5, 2015

11.8K

Related Experiment Videos

Last Updated: Aug 18, 2025

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

9.2K
Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

9.6K
Ultrasound Velocity Measurement in a Liquid Metal Electrode
08:41

Ultrasound Velocity Measurement in a Liquid Metal Electrode

Published on: August 5, 2015

11.8K

Area of Science:

  • Astrophysics
  • Plasma Physics
  • Solar Physics

Background:

  • Magnetohydrodynamic (MHD) turbulence governs energy transfer in astrophysical systems.
  • The solar atmosphere is a key area where MHD turbulence plays a significant role.

Purpose of the Study:

  • To investigate how magnetic reconnection affects the turbulent energy cascade.
  • To explore the role of plasmoids in energy transfer.

Main Methods:

  • Three-dimensional MHD simulations were conducted.
  • Simulations used a large magnetic Reynolds number to model rapid reconnection.

Main Results:

  • Magnetic reconnection breaks current sheets into plasmoids, initiating a new energy cascade.
  • The energy transfer rate is controlled by plasmoid growth.
  • Turbulent energy spectra steepen to a spectral index of -2.2.
  • Anisotropy of turbulence eddies changes.

Conclusions:

  • Plasmoids introduce a novel regime in MHD turbulence.
  • This finding has implications for understanding solar coronal heating.
  • Further exploration with observational tools is warranted.