Apr. 22, 2005
Bldg 21, Rm 183, 12:00 noon

Detection of Waves in a Coronal Mass Ejection
Tom Moran
CUA, NASA/GSFC

We have detected periodic, outwardly propagating waves in an
Earth-bound coronal mass ejection (CME) using the Solar and
Heliospheric Observatory/Large Angle Spectrometric Coronagraph.  
The waves are manifested as expanding, concentric wavefronts
comprising radially aligned density enhancements. The fronts are
as wide as 7x10^6 km in the plane of the sky.  True wavelengths
range from 1.4 to 2.8 solar radii, with periods of 130 minutes
and true wave speeds of 160 km/s to 390 km/s. The modes reveal
the CME base structure to be an array of discrete radially
aligned narrow structures, probably the legs of magnetic flux
loops.