Visibility of coronal mass ejections as a function of flare location and intensity

Details Visibility of coronal mass ejections as a function of flare location and intensity Visibility of coronal mass ejections as a function of flare location and intensity

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11012s05y&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A12, CiteID A12S05

Astronomy and Astrophysics

Astrophysics

32

Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections (2101), Solar Physics, Astrophysics, And Astronomy: Flares, Space Weather: General Or Miscellaneous, Space Weather: Solar Effects

Scientific paper

We report the visibility (detection efficiency) of coronal mass ejections (CMEs) of the Large Angle Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory (SOHO). We collected 1301 X-ray flare events (above C3 level) detected by the GOES satellite and examined their CME associations using data from LASCO coronagraphs. The CME visibility was examined using the longitudinal variation of CME association of X-ray flares, under the assumption that all CMEs associated with limb flares are detectable by LASCO. Our findings are (1) the CME association rate clearly increased with X-ray flare size from 20% for C-class flares (between C3 and C9 levels) to 100% for huge flares (above X3 level), (2) all CMEs associated with X-class flares were detected by the LASCO coronagraphs, while half (25-67%) of CMEs associated with C-class flares were invisible. We examined the statistical properties of the flare-associated CMEs and compared them by flare size and longitude. CMEs associated with X-class flares were significantly faster (median 1556 km/s) and wider (median 244°) than those of CMEs associated with disk C-class flares (432 km/s, 68°). We conclude that all fast and wide CMEs are detectable by LASCO, but slow and narrow CMEs may not be visible when the CMEs originate from the disk center.

Affiliated with

Also associated with

No associations

Rating

Visibility of coronal mass ejections as a function of flare location and intensity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Visibility of coronal mass ejections as a function of flare location and intensity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Visibility of coronal mass ejections as a function of flare location and intensity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1365866