SOHO-CDS OBSERVATIONS OF AN X2 FLARE SPRAY INJECTION

摘要

An X-class flare was reported on 10 April 2001 in AR 9415, with a halo Coronal Mass Ejection (CME) associated. The Coronal Diagnostic Spectrometer (CDS) on board the Solar and Heliospheric Observatory (SOHO) recorded a very high velocity ejection of plasma. The spatial scanning and spectral capabilities of CDS allow the measurement of both transverse and line-of-sight velocities. Components of the plasma, seen in emission from OV at around 2.5 x 10~5 K, reached transverse velocities exceeding 600-800 km/s. The nature of the spectral line profiles suggests a rotational motion superimposed upon the general outward expansion. The ejection detected using CDS is thought to be a spray of plasma with a helical structure driven by the magnetic topology.