Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh32a..05s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH32A-05
Physics
7513 Coronal Mass Ejections (2101), 7924 Forecasting (2722), 7974 Solar Effects
Scientific paper
The Solar Mass Ejection Imager (SMEI) has been observing transient mass concentrations in the interplanetary medium since it became operational in February, 2003. Most of the SMEI events are likely to associated with solar coronal mass ejections (CME), which are routinely monitored by SOHO/LASCO. The SMEI events we report here are able to be detected in the primary SMEI data product of one all-sky image per orbit, and therefore probably correspond to the biggest or brightest events. Because SMEI is in low earth orbit on the Coriolis spacecraft, parts of the sky, in any orbit, are obscured by contamination caused by the earth's radiation belts, and sometimes aurora. Thus SMEI is not necessarily sensitive to all LASCO events. In the period February 2003-September 2005 SMEI observed 171 events at times when there was good LASCO coverage. However only 120 of these events could be reasonably associated with a LASCO CME. A further 24 occurred in association with a very weak feature seen in LASCO, which would not have been expected to propagate to the location observed by SMEI without very significant acceleration and mass concentration. The remaining 27 events were not associated with any detectable feature in LASCO. Approximately 70% of the positive associations had LASCO (projected) CME speeds between 200 and 600 km/s, while only 19% were associated with LASCO CMEs above 1000 km/s. The weak LASCO associations typically involved a LASCO transient between 200 and 400 km/s as it went through the inner corona. We discuss possible physical explanations of these results.
Howard Tim A.
Simnett George M.
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