Two halo CMEs were detected by SOHO/LASCO. A very weak partial halo CME (angular width around 270 degrees, projected plane-of-the-sky speed around 350 km/s) first appeared in the LASCO C2 field of view at 12:24 UT on June 20. It was associated with the C5.0 flare peaking at 11:20 UT in the Catania sunspot group 89. Another partial halo CME (angular width around 160 degrees, projected plane-of-the-sky speed around 300 km/s) was first seen in the LASCO C2 field of view at 05:24 UT on June 21. It was associated with a filament eruption at the central meridian in the northern hemisphere. The first halo CME was more symmetric with respect to the coronagraph occulter, so we expect the arrival of the corresponding ICME on June 24, possibly resulting in a minor geomagnetic storm (K = 5). The second halo CME was mostly directed to the north of the ecliptic plane, so we expect at most a glancing blow of a corresponding ICME on June 25 without significant geomagnetic disturbances.
Equipment: Coronado 90 + Imaging Source DMK + LX75
Time UT: 16:00
Exposure 1/500 sec.