Space Weather Database Of Notifications, Knowledge, Information (DONKI)

Measurement of a faint leading edge in StereoCAT using only STEREO A COR2 imagery. STEREO A was located at a heliographic (HEEQ) longitude of +13 at the time of this eruption, which places STEREO-A's plane of sky in longitude W103 if viewed from the Earth and SDO points of view. The candidate source of this CME is just beyond the SW limb and at an apparent latitude of about S20 as seen in SDO AIA 304 and GOES SUVI 304, so a plane-of-sky measurement using STEREO A COR2 imagery could possibly be considered reasonable for ascertaining an accurate measurement. This measurement is still very uncertain though, due to uncertainty of the exact source location longitude and limited available SOHO LASCO imagery (due to the scheduled maneuver affecting LASCO imagery cadence).