Acceleration of Coronal Mass Ejections in the Low Corona and Association With Surface Activity

Details Acceleration of Coronal Mass Ejections in the Low Corona and Association With Surface Activity Acceleration of Coronal Mass Ejections in the Low Corona and Association With Surface Activity

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12b0748n&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH12B-0748

Physics

7513 Coronal Mass Ejections, 7519 Flares, 7531 Prominence Eruptions, 7549 Ultraviolet Emissions

Scientific paper

Knowledge of the acceleration characteristics of coronal mass ejections (CMEs) in the low corona is vital in properly relating eruptions observed in the outer corona to surface activity. The EUV Imaging Telescope (EIT) on the Solar Heliospheric Observatory (SOHO) provides the capability for tracking coronal transients, both eruptions of coronal plasma as well as cooler filaments, from their pre-event locations through their periods of greatest acceleration and into the fields of view of co-observing coronagraphs (LASCO, also on board SOHO). CMEs have been observed to begin with the slow expansion of very faint pre-existing coronal loops, observable only near or above the solar limb, that eventually form the leading edge of the CME. This coronal loop expansion appears to be in response to magnetic reconfiguration, inferred from the appearance of emerging magnetic flux and filament activity along an existing magnetic neutral line, at the very base of the corona. Subsequent CME accelerations as high as 0.5 km/s/s, between 100 Mm and 750 Mm above the photosphere, have been associated with both flares and quiescent filament eruptions, with no evidence to date that the type of source region determines the acceleration characteristics of the CME in the outer corona. For flare-associated CMEs originating on the visible solar disk, the acceleration frequently coincides with a rapid increase in the solar soft X-ray flux (as observed by GOES), which may provide an improved means of assigning a CME launch time in the low corona.

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