Halo CMEs in the Rise Phase of Solar Cycle 23

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Scientific paper

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7509 Corona, 7513 Coronal Mass Ejections, 7536 Solar Activity Cycle (2162)

Scientific paper

We have identified all halo coronal mass ejections (CMEs) that were observed by the SOHO LASCO coronagraphs from October 1998 to December 2000. The subset of these events that occurred on the visible half of the solar disk was identified using EUV images taken with the SOHO EIT. The source regions of the frontside halo events and their associations with other forms of solar activity (flares, prominence eruptions, EIT waves) have been identified from EIT data. These surface associations allow us to distinguish CMEs that are directed along the Sun-Earth line from large limb events that appear as halos in the coronagraph images. We compare the occurrence of significant geomagnetic activity with observations of halo CMEs during this period, and we compare the properties of the halo events with those of all CMEs.

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