ASTR 151 1st Edition Lecture 14 Outline of Last Lecture I Chapter 7 Section 1 Structure of Earth Continued II Chapter 7 Section 3 Earth s Interior III Chapter 7 Section 4 Surface Activity Outline of Current Lecture IV V Chapter 7 Section 4 Surface Activity Continued Chapter 7 Section 5 Earth s Magnetosphere VI Chapter 7 Section 6 The Tide Current Lecture I Chapter 7 Section 4 Surface Activity Continued a New crust created preserves magnetic fields b Magnetic fields i Electric charged particles creates electric fields ii No bare north or south poles they always work in pairs iii Charged particles spirals around fields c Earth i Solar wind is made up of electrons and protons High kinetic energy II Chapter 7 Section 5 Earth s Magnetosphere a Magnetosphere is the region around the Earth where charged particles in solar wind are trapped i Charged particles are trapped in the Van Allen belts 1 They spiral around the magnetic field lines b Magnetic pole don t go directly up and down i Near the poles Van Allen belts intersect the atmosphere Charged particles can escape and then create glowing lights that we know as aurorae lights These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute c Magnetoception sense which allows animals to detect magnetic fields d Origin Dynamo Theory i Rotating conducting outer core ii Causes Earth s Magnetic field e Hydrosphere i All water ii Fluctuations in water levels Tides are due to gravitational force on Earth from Moon force on the near side of Earth is greater than force on the far side III Chapter 7 Section 6 The Tide a Tidal Force variation in the Moon s gravity across the Earth b Sun has less effect due to it being farther away i It does modify lunar tides ii About half of there Earth s influences c Tides exert a drag force on the Earth slowing rotation i Will continue until the Earth rotates synchronously with the Moon so that the same phase will be visible to us
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