A new possibility to estimate the width, source location and velocity of halo CMEs

Details A new possibility to estimate the width, source location and velocity of halo CMEs A new possibility to estimate the width, source location and velocity of halo CMEs

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..453m&link_type=abstract

In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze

Physics

Space Weather, Coronal Mass Ejections

Scientific paper

It is well known that the coronagraphic observations of halo CMEs are subject to projection effects. Viewing in the plane of the sky does not allow us to determine the crucial parameters defining geoeffectivness of CMEs, such as the velocity, width or source location. We assume that halo CMEs at the beginning phase of propagation have constant velocities, are symmetric and propagate with constant angular widths. Using these approximations and determining projected velocities and difference between times when CME appears on the opposite sides of the occultation disk we are able to get necessary parameters. We present consideration for the whole halo CMEs from SOHO/LASCO catalog until the end of 2000.

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