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Related Concept Videos

Series R—L Circuit Transients01:22

Series R—L Circuit Transients

In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists of...
Reclosers and Fuses01:26

Reclosers and Fuses

Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
A comprehensive protection scheme for radial distribution...
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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...
Overcurrent Relays01:26

Overcurrent Relays

Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
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Related Experiment Video

Updated: Jul 3, 2026

Simulating Impacts of Ice Storms on Forest Ecosystems
06:27

Simulating Impacts of Ice Storms on Forest Ecosystems

Published on: June 30, 2020

Tail reconnection triggering substorm onset.

Vassilis Angelopoulos1, James P McFadden, Davin Larson

  • 1Institute of Geophysics and Planetary Physics/ESS, University of California at Los Angeles, Los Angeles, CA 90095, USA. vassilis@ucla.edu

Science (New York, N.Y.)
|July 26, 2008
PubMed
Summary
This summary is machine-generated.

Magnetospheric substorms, triggered by solar wind energy, are initiated by magnetic reconnection in the Earth

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Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
07:51

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs

Published on: August 27, 2019

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Last Updated: Jul 3, 2026

Simulating Impacts of Ice Storms on Forest Ecosystems
06:27

Simulating Impacts of Ice Storms on Forest Ecosystems

Published on: June 30, 2020

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
07:51

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs

Published on: August 27, 2019

Area of Science:

  • Space Physics
  • Earth Science
  • Plasma Physics

Background:

  • Magnetospheric substorms explosively release stored solar wind energy, causing auroral displays.
  • The trigger mechanism for substorms—near-Earth current disruption versus distant magnetic reconnection—remained debated.

Purpose of the Study:

  • To investigate the initiation mechanism of magnetospheric substorms.
  • To determine whether substorms originate from near-Earth current disruption or tail reconnection.

Main Methods:

  • Simultaneous in-situ measurements within Earth's magnetotail at multiple radial distances during substorm onset.
  • Analysis of data capturing electrical currents and magnetic reconnection signatures.

Main Results:

  • Magnetic reconnection was observed at 20 Earth radii (R(E)) in the magnetotail.
  • This reconnection occurred 1.5–3 minutes prior to key substorm events: auroral intensification, expansion, and near-Earth current disruption.

Conclusions:

  • Substorm initiation is strongly linked to magnetic reconnection occurring farther out in the magnetotail.
  • The findings support tail reconnection as the primary trigger for magnetospheric substorms.