Monday, May 28, 2012

C Class LDE, CME & Proton Event (NOAA Scale S1)

    On May 26, 2012 at approximately 20:47 UTC, a large backside solar eruption occured off of the far west limb of the solar disk producing a backside asymetrical halo CME observed by SOHO LASCO C/2 and C/3.This CME is not expected to be geoeffective. Along with this eruption, Type II, and Type IV radio emmissions were observed. This event began a 10 MeV proton event (NOAA Scale S1), Solar Radiation Storm, that onset May 27 05:05 UTC, with potential impacts being "Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies".



   This Event was followed by a LDE (Long Duration Event), C 3.1 flare from Region 1492, lasting from 04:35 untill 07:00 UTC May 27, 2012. This LDE further elevated the proton count ending with a 10 MeV proton event that peaked at 2012 May 27 10:45 UTC, End Time: 2012 May 27 1235 UTC, Maximum 10MeV Flux: 14 pfu. Along with this LDE C class flare there was a CME eruption observed from SOHO Lasco C/2 and C/3. Although not highly Earth directed, CMEs produced from this region of the solar surface generally provide Earth with a "glancing blow", so we expect to see an uptic in geomanetic activity with its arrival May 29th - 30th.

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