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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
Afven Speeds during the January 20th, 2005 CME

Pete Riley

Science Applications International Corporation

thermodynamic mhd solutions
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

slide5

Photospheric Magnetic Field

90

Latitude

0

-90

0

180

360

Longitude

slide6

Latitude

Longitude

slide12

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)

some caveats
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

concluding remarks
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!