Understanding CMEs and their source regions

Details Understanding CMEs and their source regions Understanding CMEs and their source regions

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62.1415w&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 16, p. 1415-1426.

Physics

30

Scientific paper

CMEs are an important aspect of coronal and interplanetary dynamics. They can eject large amounts of mass and magnetic fields into the heliosphere which can drive large geomagnetic storms and interplanetary shocks, a key source of solar energetic particles. However, our knowledge of the origins and early development of CMEs at the Sun is limited. CMEs are most frequently associated with erupting prominences and long-enduring X-ray arcades, but sometimes with weak or no observed surface activity. I review some of the well-determined coronal properties of CMEs and what we know about their source regions, including recent studies using Yohkoh, SOHO and radio data. One exciting, new type of observation is of halo-like CMEs which suggest the launch of a geoeffective disturbance toward Earth. Besides their utility for forecasting the arrival at Earth of magnetic clouds and geomagnetic storms, halo CMEs are important for understanding the development and internal structure of CMEs since we can view their source regions near Sun center and can measure their in-situ characteristics along their central axes.

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