ERTH 2415 Study Guide - Final Guide: Volcano, Space Weather, Astrophysical Jet
21 Jun 2014
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Document Summary
Faraday"s law in nature: variations in the earth"s magnetic field induce electrical (telluric) currents. The earth"s magnetic field (syn. geomagnetic field: extreme variations of the earth"s magnetic field can have a significant effect on technological systems. External geomagnetic field: disturbances affecting technological systems are caused by variations of the external geomagnetic field. Driven by solar activity: 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: occur in a small localized area of the sun"s surface. Magnetic storm: temporary (a few hours to a few days) large-scale perturbation of the external geomagnetic field due to high solar activity. Earth"s magnetosphere: region around the earth shielded from the solar wind by the internal geomagnetic field. Ionospheric currents: cause variations in the external geomagnetic field. Space weather: changing environmental conditions in space. Crust - thin, low-density crust rich in silicon and oxygen.
