Multi-wavelength observations of the onset phase of a coronal mass ejection

Details Multi-wavelength observations of the onset phase of a coronal mass ejection Multi-wavelength observations of the onset phase of a coronal mass ejection

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..186..337i&link_type=abstract

Solar Physics, v. 186, Issue 1/2, p. 337-361 (1999).

Physics

25

Scientific paper

The structure and dynamics of the initial phases of a coronal mass ejection (CME) seen in soft X-ray, extreme ultraviolet and optical emission are described. The event occurred on the SW limb of the Sun in active region AR8026 on 9April 1997. Just prior to the CME there was a class C1.5 flare. Images taken with the Extreme Ultraviolet Imaging Telescope (EIT) reveal the emergence of a candle-flame shaped extreme ultraviolet (EUV) cavity at the time of the flare. Yohkoh images, taken about 15min later, show that this cavity is filled with hot X-ray emitting gas. It is most likely that this is the site of the flare. Almost simultaneous to the flare, an Hα surge or small filament eruption occurs about 50arcsec northwards along the limb from the EUV cavity. At both the site of the core of the hot, EUV cavity and the filament ejection are X-ray jets. These jets seem to be connected by hot loops near their bases. Both jets disappear within a few minutes of one another. Clear evidence of the CME first appeared in the Large Angle Spectrometric Coronagraph (LASCO) and EIT images 40min after the flare and onset of the filament ejection. It seems to come from a region between the two X-ray jets. This leads to the speculation that magnetic field reconnection near one footpoint of a loop system triggers reconnection near its other footpoint. The loop system is destabilized and ultimately gives rise to the CME. This possibility is supported by magnetic field and Hα images taken when the active region was at disk center which show that the active region had a double bipole structure with dark Hα filaments between the bipoles.

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