ERTH 2415 Lecture Notes - Coronal Mass Ejection, Solar Wind, Coronal Hole
18 Aug 2014
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Document Summary
Faradays law in laboratory: magnetic field variations induce an electrical current in a medium the induced current creates its own magnetic field. Faradays law in nature variation in the earth"s magnetic field induce electrical telluric" currents. Geomagnetic hazards: extreme variations of the earth"s magnetic field can have a significant effect on technological systems. Earth"s magnetic field internal geomagnetic field (earth"s core) + external geomagnetic field (ionosphere, magnetosphere) Internal geomagnetic field due to movement liquid iron in outer core, earth"s rotation. heat transfer by convection at the outer-inner core boundary. slow variations. External geomagnetic field: disturbances affecting technological systems are caused by variations of the external geomagnetic field. Short duration driven by solar activity. The sun"s outermost atmosphere (corona) is hot and turbulent. Solar wind: stream of charged particles flowing away from the sun"s corona in all directions. Strong gusts of solar wind caused by coronal holes. Coronal holes: occur in a small localized area of the sun"s surface.
