Coronal Mass Ejection Speed as Determined by Geometric Localization

Details Coronal Mass Ejection Speed as Determined by Geometric Localization Coronal Mass Ejection Speed as Determined by Geometric Localization

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2804d&link_type=abstract

American Astronomical Society Meeting 210, #28.04; Bulletin of the American Astronomical Society, Vol. 39, p.136

Astronomy and Astrophysics

Astronomy

Scientific paper

There is a need within the space weather community for a means to accurately determine the gross properties of Earth-directed coronal mass ejections (CMEs) from a near-real-time data stream, such as the one provided by the STEREO Space Weather Beacon; CMEs are important drivers of space weather as they can trigger geomagnetic storms. A technique known as geometric localization was recently developed as a tool utilizing a series of lines of sight from two space-based observatories that can determine the location, size, and velocity of a CME. Here, we employ a simple simulation to propagate a CME from 2-15 Rsun, which corresponds to the STEREO/SECCHI COR2 field of view, and use the geometric localization technique to estimate the velocity of the CME. We subsequently compare the estimated speed to the known simulation speed and formulate an error measure for the velocity associated with this technique. We then apply the technique to available STEREO/SECCHI observations of CMEs. Improved knowledge of the CME velocity with its attendant error can be used by space weather forecasters to reduce the uncertainty in the CME arrival time at Earth.

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