ring current


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ring current

An electric current flowing westward around the Earth; it arises from a net eastward flow of electrons and a net westward flow of protons trapped inside the Van Allen radiation belts. The current produces a magnetic field that cancels part of the geomagnetic field at the Earth's surface. During geomagnetic storms, when the Van Allen belts are recharged with particles, the increased ring current results in a further decrease of the Earth's surface magnetic field strength.

ring current

[′riŋ ‚kə·rənt]
(geophysics)
A westward electric current which is believed to circle the earth at an altitude of several earth radii during the main phase of geomagnetic storms, resulting in a large worldwide decrease in the geomagnetic field horizontal component at low latitudes.
References in periodicals archive ?
In this study we will analyze several intervals of electromagnetic ion cyclotron (EMIC) wave activity observed by these spacecraft, as well as simultaneous variations in ring current fluxes and cold plasma.
Specification:-The Card Should Support 32 Fxs Ports Of Voice Interfaces, Hot Swappable, Hot Line Configurable, 8 Khz Channel Sampling Rate, A-Law Companding, Operating Frequency Of 300 To 3400 Hz, Impedance Of 600 Ohms Balanced, Rj-45 Type Connector Interface, Ring Current Voltage Of Ac75v /- 3 Hz And To Be Accommodated In Tdm Multiplexer Maple-13 Chassis.
However, the X-ray flux from very energetic flares causes sufficient change to the level of ionisation (and thus conductivity) of the ionosphere that the normal ring current flowing around the Earth is also disturbed.
The system of currents that can move water from west to east around southern Florida includes the ring current to the west, the loop current along the southern tip of the state and the Gulf Stream which pushes north along the eastern U.
In a magnetic storm the Van Allen radiation belts (the charged plasma particles surrounding the Earth) are rearranged, creating a doughnut that carries a ring current of 100 kiloelectronvolt plasma around the Earth.
After a brief historical review of early ring current studies, 32 papers on the physics and structures of the earth's inner magnetosphere are organized into sections that deal with the sources and losses of plasma and energetic particles in the inner magnetosphere, energetic particle acceleration mechanisms, external driving mechanisms of the inner magnetosphere, observational aspects of inner magnetosphere dynamics, and large-scale modeling efforts of the inner magnetosphere.
In so doing, it creates a strong electric current, or ring current, which partially girdles the magnetosphere's equator and is much greater on Earth's nightside than dayside.
On July 20, the high-field superconducting ring, which will be magnetically levitated for several hours in a large vacuum vessel, was tested to a total ring current of 1.
IMAGE has provided us with the first global maps of helium ions surrounding the Earth, the first images of the ring current, the first global images of the protons that bombard the atmosphere, and the first radar maps of ion and electron densities throughout the magnetosphere.
The boards are initially targeted at developers and integrators, and include a bundle of accessories, including station loop and ring current power supply, and station/trunk interface adapters.
Covering in turn, space weather drivers and some space weather applications, they consider such topics as interaction between the solar wind and the magnetosphere, coupling between the geomagnetic tail and the inner magnetosphere, ring currents, polar wind, space weather and the extraterrestrial planets, spacecraft charging, and space weather effects on communication and navigation.