1 / 46

Aurora

Aurora. P. A. Delamere Laboratory for Atmospheric and Space Physics. Images by John Russell. John Russell. John Russell. John Russell. John Russell. John Russell. John Russell. John Russell. John Russell. John Russell. John Russell. John Russell. John Russell. John Russell.

dianarbrown
Download Presentation

Aurora

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Aurora P. A. Delamere Laboratory for Atmospheric and Space Physics Images by John Russell

  2. John Russell

  3. John Russell

  4. John Russell

  5. John Russell

  6. John Russell

  7. John Russell

  8. John Russell

  9. John Russell

  10. John Russell

  11. John Russell

  12. John Russell

  13. John Russell

  14. John Russell

  15. Dynamics Explorer 1 satellite

  16. Noon Dawn Dusk Midnight

  17. Solar Storms, Coronal Mass Ejection

  18. Solar Wind vsw ~ 400 km/s

  19. Electron energy 1-10 keV; ~0.1 c • Acceleration process?

  20. Charged particle motion in Earth’s magnetosphere • The combined effects of the Earth’s magnetic field will result in three • characteristic types of motion. Gyro: ~ millisecond Bounce: ~ 0.1-1.0 s Drift: ~ 1-10 minutes

  21. The magnetopause controls the transport of • mass • momentum • energy • magnetic flux • into the magnetosphere

  22. Magnetic Reconnection

  23. Open vs. closed configurations of the magnetosphere Magnetic reconnection Closed Open

  24. Reconnection Geometry 3D!

  25. Ionospheric convection: Open Magnetosphere Ruohoniemi and Baker, 1998

  26. “Dungey cycle” Dungey, 1961

  27. Ionospheric convection: Closed Magnetosphere Foerster et al., 1998 Axford and Hines, [1961]

  28. Magnetospheric convection (southward IMF)

  29. Substorms • Storage and release of energy in the magnetosphere • Growth phase (energy accumulated in the magnetotail; southward IMF) • Expansion phase (energy released; auroral activity expands poleward and westward; 30-60 minutes) • Recovery phase (magnetosphere returns to original state; 1 to 2 hours; patchy aurora and quiet arcs)

  30. Theta Aurora (northward IMF) DE 1 satellite

More Related