May 22, 2013 - THE SUN - A strong solar flare measuring M5.0 was observed on Wednesday morning. The eruption was centered around Sunspot 1745.
The eruption produced a bright Coronal Mass Ejection (CME). This was the second CME of the morning, however this one could have somewhat of an Earth directed component.
WATCH: Pair of Coronal Mass Ejections - May 22, 2013.
A solar radiation storm is in progress on May 22nd following the M5-class explosion on the sun's western limb. The source of the flare, which peaked at 1332 UT, was departing sunspot AR1745. SOHO coronagraphs observed a magnificent CME emerging from the blast site:
Although the explosion was not Earth-directed, we cannot yet rule out the possibility that the CME could deliver a glancing blow to Earth in the days ahead.
The CME Prediction Model released by Goddard Space Flight Center is calling for a CME to sweep past Earth by May 25. Most of the material was directed to the west, however a portion of the plasma cloud could be directed this way. An increase in geomagnetic activity will be possible this weekend.
ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2013 May 22 1520 UTC
NOAA Scale: S2 - Moderate
Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.
WATCH: M5.0 Solar Flare & Huge CME - May 22, 2013.
SUNSPOTS: Sunspot AR1748 has substantially decayed since it unleashed four X-flares last week. It now poses a threat for lesser M-flares.
CORONAL HOLES: Solar wind flowing from this coronal hole should reach Earth on May 23-24.
SOURCES: Space Weather | Solar Ham.
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| A slow eruption around Sunspot 1745 produced a bright Coronal Mass Ejection within the past hour. |
The eruption produced a bright Coronal Mass Ejection (CME). This was the second CME of the morning, however this one could have somewhat of an Earth directed component.
![]() |
| Attached is an updated image by STEREO Ahead COR2 showing a substantial Coronal Mass Ejection leaving the Sun this morning. |
WATCH: Pair of Coronal Mass Ejections - May 22, 2013.
A solar radiation storm is in progress on May 22nd following the M5-class explosion on the sun's western limb. The source of the flare, which peaked at 1332 UT, was departing sunspot AR1745. SOHO coronagraphs observed a magnificent CME emerging from the blast site:
![]() |
| Attached is a new image by Lasco C3 showing the extent of a large CME following the M5.0 Solar Flare around Sunspot 1745. |
The speckles dancing across the image are caused
by high-energy solar protons striking the CCD camera
in SOHO's coronagraph.
Those protons were guided toward Earth by magnetic
field lines that connect our planet to the blast
site. The rain of protons is what forecasters mean
by a "radiation storm." This storm ranks
S2 on NOAA
storm scales.
![]() |
| A moderate S2 Level Radiation Storm is now in progress. Protons streaming past Earth following the solar flare is currently on the rise. |
Although the explosion was not Earth-directed, we cannot yet rule out the possibility that the CME could deliver a glancing blow to Earth in the days ahead.
The CME Prediction Model released by Goddard Space Flight Center is calling for a CME to sweep past Earth by May 25. Most of the material was directed to the west, however a portion of the plasma cloud could be directed this way. An increase in geomagnetic activity will be possible this weekend.
![]() |
| CME Prediction Model released by Goddard Space Flight Center. |
ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2013 May 22 1520 UTC
NOAA Scale: S2 - Moderate
Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.
WATCH: M5.0 Solar Flare & Huge CME - May 22, 2013.
SUNSPOTS: Sunspot AR1748 has substantially decayed since it unleashed four X-flares last week. It now poses a threat for lesser M-flares.
![]() |
| Credit: SDO/HMI. |
CORONAL HOLES: Solar wind flowing from this coronal hole should reach Earth on May 23-24.
![]() |
| Credit: SDO/AIA. |
SOURCES: Space Weather | Solar Ham.










