Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-06-23
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
15 pages, 3 figures, accepted for publication in The Astronomical Journal
Scientific paper
We determine the coronal magnetic field strength in the heliocentric distance range 6 to 23 solar radii (Rs) by measuring the shock standoff distance and the radius of curvature of the flux rope during the 2008 March 25 coronal mass ejection (CME) imaged by white-light coronagraphs. Assuming the adiabatic index, we determine the Alfven Mach number, and hence the Alfven speed in the ambient medium using the measured shock speed. By measuring the upstream plasma density using polarization brightness images, we finally get the magnetic field strength upstream of the shock. The estimated magnetic field decreases from ~48 mG around 6 Rs to 8 mG at 23 Rs. The radial profile of the magnetic field can be described by a power law in agreement with other estimates at similar heliocentric distances.
Gopalswamy Nat
Yashiro Seiji
No associations
LandOfFree
The Strength and Radial Profile of Coronal Magnetic Field from the Standoff Distance of a CME-driven Shock does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Strength and Radial Profile of Coronal Magnetic Field from the Standoff Distance of a CME-driven Shock, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Strength and Radial Profile of Coronal Magnetic Field from the Standoff Distance of a CME-driven Shock will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-393366