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
Science Applications International Corporation
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
in vicinity of active region 720.
CME (from Gopalswamy et al., 2005)
VA near active region (0, 180)
Ambient configuration != Pre-eruption config.
Processed magnetograms reduce strength of active regions
Thermodynamic solutions are preliminary => density profiles approximate
Alfven speed != fast-mode speed
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!