Current Magnetopause Position

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This cygnet displays a two-dimensional image of the boundary (magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]]) that separates Earth's magnetic domain from the solar windplasma flowing out from the sun [[Glossary/ solar wind]] and its embedded interplanetary field (IMF). The white semi-circular shape, viewed from above Earth's north pole, shows a model-computed location of the dayside magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]]. Usually, the right-most position of the semi-circle is about 10 Earth-radii (RE) upstream from Earth. The most-sunward boundary position is called the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] stand-off position.

Contents

Description

The three-dimensional location of the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] represents a balance of pressures: Pressures of solaradjective used to describe aspects or behaviors of the Sun [[Glossary/solar]]-origin balance pressures of Earth-origin at the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]]. Although this boundary is a three-dimensional (3-D) structure, for simplicity it is often shown as 2-D structure on a plane that cuts through (or contains) Earth's equator. The magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] is computed by tracing magnetic field lines in the dayside magnetosphereThe region of space dominated by the magnetic field of a star or planet. Earth’s magnetosphere takes on a tear-drop shape under the influence of the flowing solar wind. [[Glossary/magnetosphere]] in 3-D data output from the SWMF/BATSRUS magnetosphereThe region of space dominated by the magnetic field of a star or planet. Earth’s magnetosphere takes on a tear-drop shape under the influence of the flowing solar wind. [[Glossary/magnetosphere]] real-time simulation.

For reference, Earth is shown is as a circle, with white indicating the Sunward-facing side of Earth, and black indicating the night-facing side. Geosynchronous orbit is illustrated as a dashed circle. The locations of three geosynchronous spacecraft are depicted: USA NOAA's GOESGeostationary Operational Environmental Satellites (GOES) Built and launched by NASA and operated by NOAA (National Oceanic and Atmospheric Administration, ([[http://www.oso.noaa.gov/goes/]]), these satellites are in geostationary orbit over the continental US with the primary mission of observing the environmental conditions (weather). They also carry instruments that monitor the space environment. [[Glossary/GOES]]-13 and GOESGeostationary Operational Environmental Satellites (GOES) Built and launched by NASA and operated by NOAA (National Oceanic and Atmospheric Administration, ([[http://www.oso.noaa.gov/goes/]]), these satellites are in geostationary orbit over the continental US with the primary mission of observing the environmental conditions (weather). They also carry instruments that monitor the space environment. [[Glossary/GOES]]-14, and Korea's COMS satellites.

Earth's magnetic field exerts an outward magnetic pressure, as well as a very weak gas pressure produced by the tenuous plasmaa fourth state of matter where atoms are broken down into ions and separate electrons [[Glossary/plasma]] inside the magnetosphereThe region of space dominated by the magnetic field of a star or planet. Earth’s magnetosphere takes on a tear-drop shape under the influence of the flowing solar wind. [[Glossary/magnetosphere]]. The solar windplasma flowing out from the sun [[Glossary/ solar wind]] plasmaa fourth state of matter where atoms are broken down into ions and separate electrons [[Glossary/plasma]] exerts a flow (ram) pressure that opposes Earth's magnetic pressure. The solar plasmaa fourth state of matter where atoms are broken down into ions and separate electrons [[Glossary/plasma]] also produces a small gas pressure created by the random motion of the solar windplasma flowing out from the sun [[Glossary/ solar wind]] ions and electrons. Adding to the solar windplasma flowing out from the sun [[Glossary/ solar wind]] plasmaa fourth state of matter where atoms are broken down into ions and separate electrons [[Glossary/plasma]] pressure is a small component of pressure from the Sun's interplanetary magnetic field.

The region depicted in the cygnet is within 15 RE of Earth. The Sun is to the right (upstream in terms of solar windplasma flowing out from the sun [[Glossary/ solar wind]]). Earth's magnetotail is to the left (downstream in terms of solar windplasma flowing out from the sun [[Glossary/ solar wind]]). On the vertical axis, dusk is toward the top and dawn is toward the bottom. The magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] boundary is usually shown from just near dawn ~05 local time (LT)to near dusk ~19 LT. The black ring around Earth indicates a region where data are not extracted from the model.

The magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] standoff distance is calculated as the position of the last closed field line of the magnetosphereThe region of space dominated by the magnetic field of a star or planet. Earth’s magnetosphere takes on a tear-drop shape under the influence of the flowing solar wind. [[Glossary/magnetosphere]]. The magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] position is shown for local times in the day side and plotted onto the equatorial plane together with the magnitude of the current density, J, which often also indicates the position of the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]].

The data are available up to 30 to 60 minutes in the future, depending on the solar windplasma flowing out from the sun [[Glossary/ solar wind]] travel time from the ACEthe Advanced Composition Explorer (ACE) spacecraft is positioned on the Earth-Sun line and provides measurements of the solar wind plasma and radiation conditions that will impact Earth. [[Glossary/ACE]] spacecraft to the upstream simulation boundary at 33 RE.

Under quiet conditions the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] is 10 RE to 12 RE away from Earth. In dense solar windplasma flowing out from the sun [[Glossary/ solar wind]] or in the presence of a strong and negative solar windplasma flowing out from the sun [[Glossary/ solar wind]] magnetic field component Bz, the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] can move closer and even cross geosynchronous orbit (distance about 6.7 RE).

Uses

Forecast and monitor the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] boundary for close approaches to geosynchronous orbit.

Satellite operations may be modified while spacecraft are outside of the magnetosphereThe region of space dominated by the magnetic field of a star or planet. Earth’s magnetosphere takes on a tear-drop shape under the influence of the flowing solar wind. [[Glossary/magnetosphere]].

Examples

This example shows the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] at a normal distance from Earth. This example shows the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] close to Earth (compressed magnetopause). This example shows the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] extended to a distant location from Earth. In all of the examples a three day history of the most Sunward position of the mangetopause, the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] standoff position is provided on the left.

References and Credits

Shue J.H. et al, A new functional form to study the solar windplasma flowing out from the sun [[Glossary/ solar wind]] control of the magnetopauseboundary of the magnetosphere. Outside this boundary of the environment is dominated by interactions the solar wind magnetic field while inside it is primarily influenced by the Earth's magnetic field. [[Glossary/magnetopause]] size and shape, JGR, v102, pp9497-9511, May 1997.

Space Weather Modeling Framework page at CCMC

NOAA Space Weather Prediction Center

ACEthe Advanced Composition Explorer (ACE) spacecraft is positioned on the Earth-Sun line and provides measurements of the solar wind plasma and radiation conditions that will impact Earth. [[Glossary/ACE]] real time data from NOAA SWPC

SWMF/BATSRUS real time run at CCMC

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