Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0479h&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0479
Physics
7509 Corona, 7513 Coronal Mass Ejections, 7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
Soft X-ray (SXR) observations have shown that a relatively rapid dimming often is observed in coronal regions near the apparent source of a coronal mass ejection (CME). These dimmings have a close temporal correlation with the CME initiation and its associated post-flare arcade. Similar dimmings have been observed in the Extreme Ultraviolet (EUV). It has been postulated that these dimmings represent mass loss due to expansion and opening of magnetic field lines during the early stages of a CME. Typically the dimming time scale is much faster than the cooling time scale. We have studied several CME-associated dimming events occurring near the solar limb in late 2001 using observations made in EUV bands by SOHO/EIT and in SXR bands by both Yohkoh/SXT and the GOES-12 SXI instrument. The observations are of moderate cadence and spatial resolution, but are unusual in that they include full EUV and SXR event coverage from start to finish. In addition, the SXI observations in the 0.6-6.0 nm band bridge the thermal ranges accessible to EIT and SXT. Comparison of SXR and EUV data show that while there is sometimes a clear correlation between dimming regions seen in the SXR and EUV bands this is not generally the case. In addition, the higher cadence, multi-filter SXI data show the actual formation and growth of a dimming region. The high cadence data also is examined for the temporal relationship between the impulsive flare phase, the dimming, and the CME initiation. Finally, multi-filter analysis is consistent with the view that the dimming of a region is due to mass loss and not temperature decrease.
Balch Christopher C.
Hill Steven M.
Pizzo Victor J.
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