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Afven Speeds during the January 20th, 2005 CME

Afven Speeds during the January 20th, 2005 CME. Pete Riley Science Applications International Corporation. What's the significance of the Alfven speed?. Thermodynamic MHD Solutions. Energy equation, including coronal heating, thermal conduction, and radiation

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Afven Speeds during the January 20th, 2005 CME

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  1. Afven Speeds during the January 20th, 2005 CME Pete Riley Science Applications International Corporation

  2. What's the significance of the Alfven speed?

  3. Thermodynamic MHD Solutions Energy equation, including coronal heating, thermal conduction, and radiation Driven by magnetogram from Carrington Rotation 2025 Simulation advanced in time until steady-state reached Alfven speed computed from density and magnetic field strength

  4. Photospheric Magnetic Field 90 Latitude 0 -90 0 180 360 Longitude

  5. Latitude Longitude

  6. Alfven speeds as a function of height in vicinity of active region 720. CME (from Gopalswamy et al., 2005) VA near active region (0, 180)

  7. Some Caveats... Ambient configuration != Pre-eruption config. Processed magnetograms reduce strength of active regions Thermodynamic solutions are preliminary => density profiles approximate Alfven speed != fast-mode speed

  8. Concluding Remarks MHD solutions suggest shock formation certainly possible within 1.2-1.5 Rs. Structure in equatorial plane suggests two regions on either side of AR where shock formation could occur earlier. These are our first attempts to model this time period with full thermodynamic code => caution with interpretation!

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