Development of SOHO/LASCO CME Catalog and Study of CME Trajectories

Details Development of SOHO/LASCO CME Catalog and Study of CME Trajectories Development of SOHO/LASCO CME Catalog and Study of CME Trajectories

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31c10y&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH31C-10

Other

7513 Coronal Mass Ejections

Scientific paper

We present a catalog of coronal mass ejections (CMEs) based on SOHO/LASCO observations. This catalog covers the period from 1998 October to the present time. For each of the observed CMEs, the catalog contains the following information: LASCO C2 appearance time, Central Position Angle, Angular Width, height-time plots with Linear (constant speed) and 2nd order (constant acceleration) fits and corresponding speeds, and acceleration. The catalog will be open to the public via World Wide Web after proper validation. Using a preliminary version of this data set, we investigated the CME trajectories based on linear and quadratic fits to the data points. We estimated the error in the computed trajectories as follows: Generally speaking, the error in each height measurement depends on the quality of the CME feature that is tracked. So we grouped the observations into 5 classes based on the quality of the features on a 1-5 scale: Poor, Fair, Typical, Good, and Excellent. For a CME with a clear leading edge (excellent quality), the error in the measured height is small (5% of the measured height). On the other hand, for a CME with a ragged leading edge (poor quality), the error becomes larger (20% of the measured height). Based on this scheme, we assigned errorbars to the measured heights and then performed a weighted least-squares fit to the height-time trajectories. We found that for 90% of the CMEs, the linear (constant speed) fit is preferable. For the remaining 10%, quadratic fit (constant acceleration) is better than the linear fit.

Affiliated with

Also associated with

No associations

Rating

Development of SOHO/LASCO CME Catalog and Study of CME Trajectories 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 Development of SOHO/LASCO CME Catalog and Study of CME Trajectories, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Development of SOHO/LASCO CME Catalog and Study of CME Trajectories will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1274674