Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-18
Astrophys.J.665:1439-1447, 2007
Astronomy and Astrophysics
Astrophysics
22 pages with 9 figures, accepted for publication in Astrophys. J
Scientific paper
10.1086/520038
We describe a method to measure the magnetic field orientation of coronal mass ejections (CMEs) using Faraday rotation (FR). Two basic FR profiles, Gaussian-shaped with a single polarity or "N"-like with polarity reversals, are produced by a radio source occulted by a moving flux rope depending on its orientation. These curves are consistent with the Helios observations, providing evidence for the flux-rope geometry of CMEs. Many background radio sources can map CMEs in FR onto the sky. We demonstrate with a simple flux rope that the magnetic field orientation and helicity of the flux rope can be determined 2-3 days before it reaches Earth, which is of crucial importance for space weather forecasting. An FR calculation based on global magnetohydrodynamic (MHD) simulations of CMEs in a background heliosphere shows that FR mapping can also resolve a CME geometry curved back to the Sun. We discuss implementation of the method using data from the Mileura Widefield Array (MWA).
Belcher John W.
Kasper Justin Christophe
Liu Ya-Ying
Manchester IV Ward B.
Richardson John D.
No associations
LandOfFree
Determining the Magnetic Field Orientation of Coronal Mass Ejections from Faraday Rotation 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 Determining the Magnetic Field Orientation of Coronal Mass Ejections from Faraday Rotation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determining the Magnetic Field Orientation of Coronal Mass Ejections from Faraday Rotation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-431075