2014 Mar 21 1230 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # Solar Activity .24 hr Summary... Solar activity was low. Region 1014 (Dac/beta, S13E48) produced a few nominal C-class flares occurred over the period. The remaining regions were stable and unremarkable. A few coronal mass ejections (CMEs) were observed off the limbs, but all were narrow or backsided, and no Earth-directed CMEs were observed. .Forecast... Solar activity is expected to be low with a chance for more M-class activity throughout the period (21-23 Mar). Energetic Particles .24 hr Summary... The greater than 2 MeV electron flux at geosynchronous orbit was at normal levels. The greater than 10 MeV proton flux at geosynchronous orbit was at background levels. .Forecast... The greater than 2 MeV electron flux at geosynchronous orbit is expected to remain at normal levels during the forecast period (21-23 Mar). The greater than 10 MeV proton flux at geosynchronous orbit is expected to remain at background levels (below S1-Minor) for the next three days (21-23 Mar). Solar Wind .24 hr Summary... Solar wind parameters, as measured by the ACE spacecraft, reflected predominately nominal conditions for the period. Wind speed values averaged near 340 km/s. Total field values rose to near 10 nT multiple times, but intermittently. The Bz component decreased to near -5 nT for an extended period between 21/0100 and 21/0900 UTC. The phi angle was in a predominately negative (toward) orientation. .Forecast... Solar wind parameters are expected to continue at background levels until the anticipated arrival of a positive-polarity, coronal hole high-speed stream (CH HSS) mid-to-late on day three (23 Mar). Wind speed enhancement and magnetic field variability are expected due to effects from this feature. Geospace .24 hr Summary... The geomagnetic field was quiet to unsettled. Unsettled conditions were believed to be due to an extended period of southward Bz. .Forecast... The geomagnetic field is expected to be at mostly quiet levels on days one and two (21-22 Mar) and quiet to unsettled levels on day three (23 Mar) due to the anticipated arrival of a CH HSS.
Posted on: Fri, 21 Mar 2014 17:37:35 +0000
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