lecture7 - ECE2984 Lecture7 SPACEENVIRONMENT:...

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ECE 2984 Lecture 7 SPACE ENVIRONMENT: THE THERMOSPHERE AND IONOSPHERE Joseph Baker (ECE Dept) Lecture 7: Thermo Ionosphere ECE 2984:Exploration of Space
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Last 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 7: Thermo Ionosphere ECE 2984:Exploration of Space
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This 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 Discrete and Diffuse Aurora uroral bstorms Joseph Baker (ECE Dept) Lecture 7: Thermo Ionosphere ECE 2984:Exploration of Space Auroral Substorms
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Laptop and Attendance Policy I can think of only two valid reasons why you might have your laptop open: 1) You are following the lecture slides through Scholar 2) You are taking notes while I am talking ur ptop pen nd u o ot tend e ngaged ither f ese If your laptop is open and you do not intend to be engaged in either of these activities during the lecture then please close the laptop now. I have also noticed that attendance has been sporadic over the past two weeks. If I continue to notice people using their laptops for other purposes during class time and/or there continues to be poor attendance then I will have to seriously reconsider some of my class management policies. Options might include: 1) Taking attendance at each lecture Joseph Baker (ECE Dept) Lecture 7: Thermo Ionosphere ECE 2984:Exploration of Space 2) Doing random pop quizzes 3) Removing the lecture notes from Scholar
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The Thermosphere Joseph Baker (ECE Dept) Lecture 7: Thermo Ionosphere ECE 2984:Exploration of Space
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Solar Spectrum The Sun radiates at a Blackbody temperature of 5770K but there is excess of short wavelength radiation which is more energetic and variable. The solar radiation has two major influences on the Earth’s upper atmosphere: 1) Heating 2) Ionization Ordinarily, radiation with orter avelengths shorter wavelengths (e.g. X rays) should penetrate deeper into the atmosphere…. Joseph Baker (ECE Dept) Lecture 7: Thermo Ionosphere ECE 2984:Exploration of Space BUT…. .
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Solar Absorption Fortunately (for us), most of the high energy radiation is absorbed in the upper h ll d t ti l l ) atmosphere bymolecules and ions that particularly like it (e.g. Ozone). The upper atmosphere is particularly susceptible to space weather disturbances because the sun is much more variable at shorter wavelengths.
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lecture7 - ECE2984 Lecture7 SPACEENVIRONMENT:...

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