Under the Weather: Space Weather. The Magnetic Field of the Heliosphere

Details Under the Weather: Space Weather. The Magnetic Field of the Heliosphere Under the Weather: Space Weather. The Magnetic Field of the Heliosphere

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000enes.conf...66r&link_type=abstract

2000 NCCS Highlights: Enabling NASA Earth and Space Sciences, p. 66-71

Physics

Charged Particles, Collisions, Disorientation, Energetic Particles, Geomagnetism, Magnetohydrodynamics, Solar Activity, Solar Flares, Solar Storms, Auroras, Darkness, Plasmas (Physics), Ozone, Solar Wind, Upper Atmosphere

Scientific paper

Normally, only people in the far north can enjoy the dancing beauty of the aurora borealis; however, an intense collision of charged solar particles with the Earth's magnetic field can magnify the Northern Lights so much that they are visible in the southern United States. Behind the light show lies enough flux of energetic particles carried by solar wind to render our planet uninhabitable. The Earth's magnetic field, also known as the magnetosphere, is the only thing that shields us from the Sun. Even the magnetosphere cannot fully guard us from the wrath of the Sun. In March 1989, a powerful solar flare hit Earth with such energy that it burned out transformers in Quebec's electrical grid, plunging Quebec and the eastern United States into darkness for more than 9 hours. Northern lights and energy grid overloads are not the only ways that a solar wind can affect us. A solar storm in July 1999 interrupted radio broadcasts. Solar activity can disorient radars and satellite sensors, break up cell phone connections, and threaten the safety of astronauts. A large bombardment of solar particles can even reduce the amount of ozone in the upper atmosphere. Magnetohydrodynamics (MHD), the study of magnetic fields in magnetized plasmas, can help scientists predict, and therefore prepare for, the harmful side effects of solar weather in the magnetosphere.

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