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lecture6 - ECE2984 Lecture6...

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ECE 2984 Lecture 6: SPACE ENVIRONMENT: THE MAGNETOSPHERE Joseph Baker (ECE Dept) Lecture 6: The Magnetosphere ECE 2984:Exploration of Space
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Last Lecture The Geomagnetic Field Generation Mechanism Geological History The Lorentz Force and Right Hand Rule The Lorentz Force and Right Hand Rule Charged Particles in a Magnetic Field: 3 different motions Magnetosphere Configuration Dayside versus nightside magnetic field geometry The 3 major current systems responsible for magnetic distortion Field Aligned Currents into upper atmosphere: 2 major systems The Bowshock and Magnetosheath Shocks in plasma versus shocks in neutral gases Joseph Baker (ECE Dept) Lecture 6: The Magnetosphere ECE 2984:Exploration of Space The 2 different types of bowshock
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This Lecture The Magnetosphere The Magnetopause and Boundary Layers The Magnetotail: Lobes and Plasma Sheet The Plasmasphere (trapped “cold” plasma) The Radiation Belts (trapped “hot” plasma) Magnetospheric Plasma Circulation Joseph Baker (ECE Dept) Lecture 6: The Magnetosphere ECE 2984:Exploration of Space
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The Magnetosphere Joseph Baker (ECE Dept) Lecture 6: The Magnetosphere ECE 2984:Exploration of Space
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Magnetospheric Boundary Regions: The Magnetopause and Cusp Joseph Baker (ECE Dept) Lecture 6: The Magnetosphere ECE 2984:Exploration of Space
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The Magnetopause The magnetopause is the magnetic boundary between the geomagnetic field and the interplanetary magnetic field. Inside the magnetopause is the geomagnetic field; outside the magnetopause is the interplanetary magnetic field. The magnetopause also marks the transition between magnetospheric plasma and the shocked solar wind plasma (i.e. the magnetosheath). Th t l ti i h th f th l i d (i P kT) Joseph Baker (ECE Dept) Lecture 6: The Magnetosphere ECE 2984:Exploration of Space The magnetopause location is where the gas pressure of the solar wind (i.e. P=nkT) perfectly balances the magnetic pressure of the geomagnetic field (i.e. P=B 2 /2 μ 0 )
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The Magnetopause The abrupt change in B is the magnetopause Joseph Baker (ECE Dept) Lecture 6: The Magnetosphere ECE 2984:Exploration of Space Early measurements of the magnetopause obtained by Explorer XII in 1961
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The Cusp 8 10 Neutral 8 10 Neutral FIELD LINES OF A MAGNETIC DIPOLE FIELD LINES OF A MAGNETIC DIPOLE AND ITS IMAGE 2 4 6 Point 2 4 6 Solar Wind Point -4 -2 0 Z (Re) Solar Wind -4 -2 0 Z (Re) R m 0 5 10 15 -10 -8 -6 0 5 10 15 -10 -8 -6 X (Re) X (Re) The interaction of the solar wind with the dayside magnetosphere forces field lines that would ordinarily close on the dayside to be swept tailward. This produces two neutral points called the “cusps” which are soft points where Joseph Baker (ECE Dept) Lecture 6: The Magnetosphere ECE 2984:Exploration of Space This produces two neutral points called the cusps which are soft points where solar wind plasma has direct access to the magnetosphere.
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The Cusp Close up view of the high altitude cusp as seen from the dawn side flank.
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