lecture8 - ECE2984 Lecture8:...

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ECE 2984 Lecture 8: GEOMAGNETIC ACTIVITY AND SPACE WEATHER Joseph Baker (ECE Dept) Lecture 8: Geomagnetic Activity ECE 2984:Exploration of Space
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Last Lecture The Thermosphere: Atmospheric Composition and Temperature Structure Thermospheric Variability and Winds e nosphere The Ionosphere: Ion Production and Loss Ionospheric Composition and Layered Structure Ionospheric Variability and Currents Aurora: Production Mechanism Discrete and Diffuse Aurora uroral bstorms Joseph Baker (ECE Dept) Lecture 8: Geomagnetic Activity ECE 2984:Exploration of Space Auroral Substorms
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This Lecture Geomagnetic Activity agnetic dices Magnetic Indices Geomagnetic Storms Space Weather The Space Weather Prediction Center Effects on Human Health NEXT LECTURE: Space Weather p Effects on Spacecraft Effects on Power, Communications and Navigation Joseph Baker (ECE Dept) Lecture 8: Geomagnetic Activity ECE 2984:Exploration of Space
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Aurora Joseph Baker (ECE Dept) Lecture 8: Geomagnetic Activity ECE 2984:Exploration of Space
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Magnetospheric Substorms st cture e lked out bstorms Last lecture we talked about substorms. A substorm consists of a growth phase (energy accumulation), an expansion phase (energy dissipation) and a recovery phase. Substorms can be considered a standard “mode” of magnetospheric activity in which solar wind energy is processed within the magnetosphere ionosphere system. A substorm has a variety of “signatures” that can be measured by instruments on the ound r ace ground or in space: Fluctuations in electromagnetic fields Brightening of auroral emissions creases lasma ensity nd locity Joseph Baker (ECE Dept) Lecture 8: Geomagnetic Activity ECE 2984:Exploration of Space Increases in plasma density and velocity
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Substorms Joseph Baker (ECE Dept) Lecture 8: Geomagnetic Activity ECE 2984:Exploration of Space
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Substorms Joseph Baker (ECE Dept) Lecture 8: Geomagnetic Activity ECE 2984:Exploration of Space
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Geomagnetic Activity “Geomagnetic Activity” refers to fluctuations in the near Earth space nvironment roduced y ynamic environment produced by dynamic changes in the solar wind and interplanetary magnetic field (IMF) which have their origins on the sun. Solar activity is thus the “cause” and geomagnetic activity is the “effect”. A substorm is just one example of omagnetic tivity geomagnetic activity. Historically, geomagnetic activity has been measured using “magnetometer” instruments which measure the strength and direction of magnetic fluctuations. Magnetic fluctuations measured by magnetometers are produced by dynamic anges e rrent stems owing Joseph Baker (ECE Dept) Lecture 8: Geomagnetic Activity ECE 2984:Exploration of Space changes in the current systems flowing in the magnetosphere and ionosphere.
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Ground Magnetometers Magnetometers are relatively cheap and robust instruments that can be deployed in remote locations worldwide (left figure). The combined measurements can be
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This note was uploaded on 09/19/2011 for the course ENGE 1114 taught by Professor Twknott during the Fall '06 term at Virginia Tech.

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lecture8 - ECE2984 Lecture8:...

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