Three dimensional structure of the 21 April 2002 Coronal Mass Ejection

Details Three dimensional structure of the 21 April 2002 Coronal Mass Ejection Three dimensional structure of the 21 April 2002 Coronal Mass Ejection

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0806l&link_type=abstract

American Astronomical Society, SPD meeting #37, #8.06; Bulletin of the American Astronomical Society, Vol. 38, p.231

Astronomy and Astrophysics

Astronomy

Scientific paper

A three dimensional reconstruction of the 21 April 2002 partial halo Coronal Mass Ejection (CME) has been made based on the O VI 1032 and [Fe XVIII] 974 lines observed by the Ultraviolet Coronagraph Spectrometer (UVCS) on board Solar and Heliospheric Observatory (SOHO). We use the Doppler velocities to derive the CME structure along the line-of-sight. UVCS observed the O VI line profiles split into strongly red-and blue-Doppler shifted components, and the region of split profiles grew rapidly along the long spectrograph slit. The more localized [Fe XVIII] bright emission starts at the same time as the maximum red Doppler shift of O VI, indicating that it is inside the CME. In the view from the solar west, the O VI looks like halo CMEs seen by Large Angle and Spectrometric Coronagraph (LASCO). The [Fe XVIII] bright emission appears as a bar-like structure seen nearly end-on from the Earth, and side-on from the solar north and from solar west. The reconstructed [Fe XVIII] emission allows two interpretations, as ejection of pre-existing hot plasma or as a current sheet. The evidence favors the current sheet interpretation, though we cannot rule out the alternatives.

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