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USING HALO CMES TO STUDY THE INTERNAL STRUCTURE OF CMES
The SOHO LASCO coronagraphs have observed many halo or partial-halo CMEs
since early 1996. A halo CME, especially when associated with solar activity
near sun center, is important because it suggests the launch of a geoeffective
disturbance toward Earth. Because such events can be viewed along their
central axes by near-Earth spacecraft, we can use them to better understand
the internal structure of CMEs and magnetic clouds. A study of the
geoeffectiveness of halo CMEs observed during the first half of 1997 showed
that all halo CMEs associated with frontside, near-Sun center surface activity
were followed 3-5 days later by shocks, magnetic clouds and moderate storms
at Earth. We report on the results of extending this examination to all
halo CMEs observed through 1999.
Authors: Webb, D.F., O.C. St. Cyr, B.J.
Thompson, and R.A. Howard
Organization: Boston College
29 Randolph Road
Hanscom AFB, MA
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