03:54 UT HALO The event was first seen in C2 at 03:54 UT as a very bright loop-like front spanning all above the NW, N Pole, NE, and E Limb. Faint and diffuse extensions can be seen all around the C2 occulting disk, though they are extremely faint above the S Pole. The main loop front develops in the C2 FOV toward N with its legs apparently anchored on the W and ESE limbs. The event is first seen in C3 at 04:18 UT, very bright on NE, with faint and diffuse circular extensions already surrounding completely the C3 occulting disk. The mean- plane-of-sky speed for different features of the event at several position angles is given below (based on C3 data): - LE of the diffuse front at: PA 000: 1484 km/sec PA 035: 1471 km/sec PA 180: 1230 km/sec (LE rather faint and diffuse) PA 275: 1160 km/sec (LE rather faint and diffuse) - LE of the bright loop front developing mainly toward NE, at PA 040: 1160 km/sec showing practically no acceleration (in all cases). GOES reported extremely low X-ray activity during the day (A-class). The disk of the Sun is spotless. Likewise, EIT 195 images do not show any significant activity on the disk. Only likely signature of the event is an extremely faint intensity disturbance that seems to propagate all above the limb in the northern hemisphere starting at around 03:24 UT. In summary, the event has therefore been classified as a strong full halo event, backsided. 08:54 UT N West Extremely faint and wide loop front. Not discernible in C3. 09:08 UT N East Faint and diffuse front folloqed at 10:06 by an (slightly brighter) elongated loop front. The latter fades throughout C3. Gusty outflow. 12:30 UT N Pole Diffuse jet-like front. 13:31 UT W Limb Ragged loop front. 15:00 - 17:00 UT No LASCO C2 images. High cadence C3 PBs images for the Faraday Rotation Study with Cassini Campaign. 17:07 UT N West Extremely faint loop front that fades throughout C2. 18:06 UT W Limb Diffuse front that fades throughout C3. It is followed at 19:31 UT by a very faint, diffuse, and wide loop front all over the S Pole, which seems to develop apparently fully surrounding the C2 occulting disk. Barely discernible in C3, and only close to the inner edge of its FOV. 18:30 UT N East Very faint and diffuse loop-like front. It fades throughout C3. 23:30 UT W Limb Initially bright ragged loop front with structured interior.
01:54 UT N East Very faint and elongated loop-like front. 02:30 UT S East Extremely faint and wide loop front. 06:30 UT N East Ragged blob-like front in the gusty outflow. 09:54 UT E Limb Diffuse and elongated loop-like front. Time of the last C2 image under analysis: 12:30 UT.