Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh23a1835y&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH23A-1835
Astronomy and Astrophysics
Astrophysics
[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7519] Solar Physics, Astrophysics, And Astronomy / Flares, [7924] Space Weather / Forecasting
Scientific paper
The COR1 coronagraphs on STEREO-A and -B observed an Earth-directed CME originating from N09W15 at 02:20 UT on 2010/07/09. The apparent CME speed is only 291 km/s, and the angular width is 60 degrees. The CME is somewhat slower than the average LASCO CME (average speed ~450 km/s) but not narrow. The CME was expected to be seen as a halo CME because of the geometry and large width. However, the CME could not be identified in the LASCO running difference movie because of the visibility of the white-light coronagraph. On the other hand, EUV images taken by SDO/AIA show a clear dimming to the northwest of the source region and a wave-like feature propagating to the east. Faint Earth-directed CMEs, seem to be better indicated by surface eruptive signatures such as dimming and EUV waves. We discuss how to estimate CME parameters using the EUV data alone.
Akiyama Sanae
Gopalswamy Nat
Yashiro Seiji
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