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Magnetic & Acoustic Waves in the Aurora

Magnetic & Acoustic Waves in the Aurora. Jada Maxwell. Photo: Michael Klensch Courtesy of http:www.nordlys.com. Can magnetic waves in the aurora transform into acoustic waves?. Magnetic Waves. Earth. Transform into Sound Waves. Earth. Types of Magnetic Waves. Alfvén waves (s-mode).

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Magnetic & Acoustic Waves in the Aurora

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  1. Magnetic & Acoustic Waves in the Aurora Jada Maxwell Photo: Michael KlenschCourtesy of http:www.nordlys.com

  2. Can magnetic waves in the aurora transform into acoustic waves?

  3. Magnetic Waves Earth

  4. Transform into Sound Waves Earth

  5. Types of Magnetic Waves • Alfvén waves (s-mode) • Magnetosonic (like acoustic waves=p-mode) Images courtesy of Georgia State Universityhttp://hyperphysics.phy-astr.gsu.edu/hbase/sound/tralon.html BBC animations

  6. Velocity of Waves

  7. Beta

  8. Plasma is like Rubber Bands in Jello

  9. Where Does Beta=1?

  10. Earth’s Atmosphere Image courtesy of http://en.wikipedia.org/wiki/Image:Atmosphere_model.pngGraph made from data obtained at http://uap-www.nrl.navy.mil/models_web/msis/msis_home.htm

  11. Calculating Magnetic Pressure (PB)

  12. Calculating Gas Pressure (PG)

  13. Calculating Velocity of Acoustic Waves (CS)

  14. Calculating Velocity of Alfvén Wave (VA)

  15. Calculations for Fairbanks, Ak

  16. Where Does Beta=1?

  17. More Questions to Investigate • How does atmospheric heating from auroral processes affect Beta? • At what frequencies do these waves occur? • How much does wave transformation contribute to infrasound compared with the gas expansion theory?

  18. Sources: • Thanks to Dr. E.J. Zita for her guidance and helpful discussions • Johnson, M.C., Petty-Powell, Sarah and Zita, E.J., ‘Energy Transport by MHD Waves Above the Photosphere Numerical Simulations,’ 17 Oct 2002 • Michael KlenschCourtesy of http:www.nordlys.com • http://en.wikipedia.org/wiki/Image:Atmosphere_model.pngGraph made from data obtained at http://uap-www.nrl.navy.mil/models_web/msis/msis_home.htm • Georgia State Universityhttp://hyperphysics.phy-astr.gsu.edu/hbase/sound/tralon.html

  19. http://academic.evergreen.edu/m/maxjad02

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