Solar Terrestrial Activity Report Recent development The geomagnetic field was quiet to unsettled on August 2. Solar wind speed ranged between 383 to 475 km/sec. Solar flare activity was high. Solar flux was 212.5, the planetary A index was 9 (3-hour K indices: 2232 2332, Boulder K indices: 0333 2321). Region 8640 rotated off the visible disk. Region 8645 decreased slightly in areal coverage and spot count. A weak magnetic delta configuration was observed in the hours prior to the X flare. M class flares are likely and an additional X flare is possible from this region. Region 8647 developed quickly and could produce a minor M flare. Region 8648 decayed into spotless plage. Region 8649 decayed quickly and could become spotless today or tomorrow. Region 8650 decayed slowly. Region 8651 developed further into the (without comparison) largest region observed during solar cycle 23. The region has a weak magnetic delta configuration and is capable of producing an X flare at any time. Region 8653 rotated off the visible disk. Region 8654 decayed slowly and appears to be spotless early on August 3. Region 8655 was quiet and stable and is spotless early on Agusut 3. Region 8656 is developing slowly and could start producing C flares today. New region 8657 rotated partly into view at the southeast limb. Flares and CMEs A total of 13 C flares, 1 M flare and 1 X flare were recorded on August 2. Region 8645 was the source of an X1.4/1B flare at 21:25 UTC. The flare was accompanied by a moderately strong type II sweep. A full halo CME was observed late in the day, but I am not yet sure this was related to the X flare. An optically uncorrelated M1.8 was recorded at 00:27 UTC, apparently associated with a weak type II sweep. A full halo CME was observed in LASCO C2 starting from 08:06 UTC, LASCO-EIT images suggest region 8651 may have been the source of this CME. August 1: Region 8651 was the source of a C3.5 long duration event peaking at 21:16 UTC. A moderately strong type II sweep accompanied the flare. A full halo coronal mass ejection was associated with the flare and could impact the earth late on August 4. July 31: The most interesting event of the day was a large filament eruption to the northeast of region 8651. The eruption started just before noon and created a full halo coronal mass ejection, however, the halo was weak over the southwest limb and south pole. The CME has a fairly high probability of impacting the earth with the most likely arrival time from late on August 2 to late on August 3. The background x-ray flux is at the class C2 level. Coronal holes No obvious coronal holes are currently approaching geoeffective positions.