On 2005/07/06, SOHO Telemetry Submode was changed to Submode 5 (support for VAULT -Sounding Rocket Launch on 2005/07/07). Telemetry Submode will be changed back to Submode 6 on 2005/07/08 at 15:00 UT. During TM Submode 5, EIT 195 CME watch in half-res (512x512).
04:06 UT EN East Slow development of a system of loops along streamer. The event superposes in the LOS with the Partial Halo under development reported to start at 21:26 UT on previous day. NOTE: LASCO/EIT observed two frontsided events on 2005/07/07, which were likely associated with: i) the eruption of a filament south of NOAA AR 10786, starting at 11:00 UT (EIT 195 time), hereafter Event "A", and ii) an M4.9 X-ray flare on NOAA AR 10786 (N09E03) that peaked at 16:29 UT (hereafter event "B"). 12:06 UT S East Likely signatures of event "A" were first seen in C2 at 12:06 UT above the SE limb, as a very faint and diffuse front [1]. Note that by 12:26 UT, a slightly brighter front (also diffuse) appears above the E Limb. This particular front could be be associated with activity on NOAA AR 10789 at N17E48 (see below). Finally, by 13:26 UT, a wide loop-like expanding front [2] makes its appearance above the SE limb preceded by a small front (~ 12:50 UT) on E. The event seems to barely surround the C2 occulting disk by just 16:06 UT, just before the appearance of the event associated with the M4.9 X-ray flare. The diffuse front [1] is first seen in C3 at 12:42 UT above the ESE Limb, preceding the expanding loop front [2] at 14:42 UT on SE. It is difficult to say whether the event in C3 covers the C3 occulting disk, partly due to the appearance in the C3 FOV at 17:42 UT of the brighter and apparently faster event associated with the M4.9 X-ray flare. The mean plane-of-sky of the LE of [1] was 657 km/sec at PA 108 (big uncertainty in its determination as LE too diffuse). As for the front [2], its mean-plane-of-sky speed was 456 km/sec at PA 132. Both cases based on C3 data. GOES reported the following X-ray events by the time: - a C2.6 X-ray flare on NOAA AR 10789 (N17E48) between 12:18-12:55 UT with peak emission at 12:29 UT, and - a C3.8 X-ray flare on NOAA AR 10786 (N10E04) between 13:25-13:34 UT with peak emission at 13:29 UT. EIT 195 images show the eruption of a filament just a little bit south of AR 10786, starting at ~ 11:00 UT. Corresponding running difference images show the ejection of material toward SE. In summary, the event has been determined as at least a partial halo CME (maybe a very asymmetric full halo event) most likely associated with the eruption of a filament practically at the center of the disk. 17:06 UT E Limb Event "B": The event was first seen in C2 at 17:06 UT all above the E limb, as a wide and ragged front (emission brighter on ENE as it develops). By 18:50 UT, the C2 occulting disk seems to be completely covered, though the signal is extremely faint on the western hemisphere. The event is first seen in C3 at 17:42 UT above the NE Limb, developing afterward as a very asymmetric halo CME. The mean plane-of-sky of the LE of the event at PA ~ 25 was ~ 744 km/sec (based on C3 data). GOES reported an M4.9 X-ray flare on NOAA AR 10786 (N09E03) between 16:07 - 16:40 UT with peak emission at 16:29 UT. For completeness, note that there was also a C2.7 X-ray flare on NOAA AR 10789 (N17E44) between 14:37 - 15:34 UT with peak emission at 15:19 UT. EIT 195 images show a relatively strong brightening starting at ~ 16:12 UT on AR 10786. A dimming region to NE of AR 10786 can be seen afterward. Corresponding running difference images show an intensity disturbance traveling mainly toward N of the AR. In summary, the event has therefore been determined as a rather asymmetric full halo CME, associated with an M4.9 X-ray flare on NOAA AR 10786. 22:06 UT N East Faint and asymmetric expanding loop front. It fades throughout C3.
07:27 UT N East Elongated loop front developing toward ENE. Time of the last C2 image under analisys: 11:26 UT.