The Sun Today :
Updated April 19, 2014
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Updated 04/19/2014 @ 13:30 UTC
Solar Update / Storm Watch
Good morning. Below is an updated look at the visible solar disk on Saturday. Solar activity declined to lower levels during the past 24 hours following an M7.3 solar flare around region 2036 on Friday morning at 13:03 UTC. That event was responsible for a halo coronal mass ejection (CME) with a partially Earth directed component. An impact to our geomagnetic field will be possible beginning on Sunday. A minor geomagnetic storm watch has been issued by the NOAA / Space Weather Prediction Center. Newly numbered sunspots 2044 and 2045, now turning into view off the southeast limb, are each producing low level C-Class solar flares. Elsewhere, regions 2034, 2035, 2036, 2038 and 2040 each showed some signs of minor to moderate spot growth during the past 12 hours. All other regions are currently stable. There will remain a chance for another isolated M-Class event during the next 24 hours.Stay Tuned to SolarHam.com for the latest information.
The Visible Solar Disk (Saturday) - Click for Map
Added 04/18/2014 @ 13:20 UTC
M7.3 Solar Flare Observed
A moderately strong solar flare measuring M7.3 was observed around region 2036 on Friday morning peaking at 13:03 UTC. A 10cm Radio Burst (TenFlare) measuring 1000 sfu and lasting 24 minutes was associated with the event. The flare itself was long in duration and a halo coronal mass ejection (CME) is now visible in the latest STEREO Ahead COR2 imagery. Additional imagery courtesy of LASCO C2 shows that a majority of the plasma was directed to the south, but a weaker Earth directed component is visible. An impact to our geomagnetic field will be possible within 48-72 hours. Stay tuned for the latest information. Click HERE for an updated event log. Imagery by SDO/EVE.
Radiation Storm: Energetic proton levels streaming past Earth continue to rise and are now at the minor (S1) radiation storm threshold.
ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2014 Apr 18 1525 UTC
NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
Older News Archive | Current Month
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center and the U.S. Air Force.
UPDATED 2014 Apr 19 1230 UTC
.24 hr Summary...
Solar activity reached high (R2-Moderate) levels early in the period
with only low-level C-class activity observed since. Region 2036
(S17W48, Dkc/beta-gamma) produced an M7 flare at 18/1303 UTC; the
largest flare of the period. This event was accompanied by a Castelli-U
discrete radio signature to include a 1000 sfu Tenflare and Type II (851
km/s) and Type IV radio emissions. An asymmetric halo CME was
subsequently observed in SOHO/LASCO C2 coronagraph imagery at 18/1325
UTC. Analysis suggested the ejecta was moving at approximately 1000 km/s
and Earth-directed. Region 2036 indicated some intermediate spot
development during the period.
Region 2034 (N05W46, Ekc/beta-gamma) remained the largest group on the
disk. The region showed some consolidation in its leader spots and
developed a weak beta-gamma magnetic configuration. The region produced
a C1/Sf flare at 19/0600 UTC. Region 2038 (S11E15, Dsi/beta) had rapid
spot development to the north and west of the region.
Two new regions were numbered over the past 24 hours. New Region 2044
(S20E58, Bxo/beta) developed on the disk and produced a C2 x-ray event
at 20/0324 UTC. New Region 2045 (S25E84, Hax/alpha) rotated onto the
disk and produced a C1 x-ray event at 19/0939 UTC.
The remaining spotted regions indicated little change during the period.
No additional Earth-directed CMEs were detected.
Solar activity is likely to be moderate (R1-Minor) with a slight chance
for high (R3-Strong) or greater for the next three days (19-21 Apr) due
to the number of complex regions currently populating the disk.
[Full Report and Forecasts]
[Report of Solar-Geophysical Activity]
A - Alpha (single polarity spot).
B - Beta (bipolar spot configuration).
G - Gamma (atypical mixture of polarities).
BG - Beta-Gamma (mixture of polarities in a dominantly bipolar configuration).
D - Delta (opposite polarity umbrae within single penumbra).
BD - Beta with a Delta configuration.
BGD - Beta-Gamma with a Delta configuration.
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[Latest Solar Region Summary (SRS)]
[SolarHam Sunspot Summary]