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Active sunspot 1263 has left the Earthside of the sun

active-sunspot-1263-has-left-the-earthside-of-the-sun

Active sunspot 1263, which just two days ago produced the most powerful solar flare of the new Solar Cycle (an X7), has left the Earthside of the sun. It is now beginning a two week transit across the solar farside. We can still see signs of its ongoing activity, however. On August 11th, an eruption from sunspot 1263 hurled a bright CME over the sun’s western limb:

For the next two weeks (the time it takes to transit the sun’s farside) no blasts from sunspot 1063 will be Earth directed. For the next few days, however, we could see a few more parting shots. (SpaceWeather)

After all of the excitement the past couple of weeks, the visible solar disk almost appears blank with the exception of a couple of small new sunspots that have formed (1269+1270). Sunspot 1266 has faded away. Solar activity should be at very low levels heading into the weekend. (SolarHam)

NOAA Solar report (2011 Aug 11 2200 UTC)
Region 1263 (N17, L=301) produced a C6 x-ray flare from beyond the west limb. New regions 1269 (S22E17) and 1270 (S23E54) were numbered today; both are small and magnetically simple. A CME was observed on the west limb, evident in SOHO/LASCO C2 imagery at 11/1036Z. Material movement and subsequent darkening was observed in STEREO-A EUV imagery beginning at approximately 11/1005Z. This CME is not expected to be geoeffective.

The geomagnetic field was quiet. Solar wind speed at the ACE spacecraft continued to decline and ended the period near 400 km/s.The Phi angle briefly switched to negative between 11/10Z and 11/12Z. The Bz component of the interplanetary magnetic field remained around zero. A shock was observed in the STEREO-A bacon
data at roughly 11/0600Z. This is most likely the arrival of the 09 August CME from Region 1263. The greater than 2 MeV electron flux at geosynchronous orbit was at high levels throughout the period.

The geomagnetic field is expected to be predominantly quiet for the next three days (12-14 August).

 

GIF MOVIES
LASCO/C2 LASCO/C3 EIT 304A

64M

68M

68M
1/4 Resolution
15M
1/4 Resolution
16M
1/4 Resolution
5.5M
EIT 195A EIT 171A EIT 284A

23M

21M

24M
1/4 Resolution
6.1M
1/4 Resolution
5.5M
1/4 Resolution
6.1M

These GIF movies are courtesy of the LASCO/NRL SOHO team.

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