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Formation of Transient Coronal Holes during the Eruption of a Quiescent Filament and its Overlying Sigmoid

Yang, Li-Heng; Jiang, Yun-Chun; Ren, Dong-Bai

By using Hα, He I 10830, EUV and soft X-ray (SXR) data, we examined a filament eruption that occurred on a quiet-sun region near the center of the solar disk on 2006 January 12, which disturbed a sigmoid overlying the filament channel observed by the GOES-12 SXR Imager (SXI), and led to the eruption of the sigmoid. The event was associated with a …

Speed Distributions of CMEs in Cycle 23 at Low and High Latitudes

Gao, Peng-Xin; Li, Ke-Jun

We analyzed the speed (v) distributions of 11584 coronal mass ejections (CMEs) observed by the Large Angle and Spectrometric Coronagraph Experiment on board the Solar and Heliospheric Observatory (SOHO/LASCO) in cycle 23 from 1996 to 2006. We find that the speed distributions for high-latitude (HL) and low-latitude (LL) CME events are nearly ident…