Sunday, March 4, 2012

X1.1 Solar Flare LDE - March 5, 2012

   Update 14:25 UTC March 5, 2012 :

A X1.1 long duration solar flare has occurred around sunspot region 1429 at 04:09 UTC  March 5, 2012. This LDE event is still in progress at this time.
A R3 radio blackout has occurred and there was a large CME associated with this X1.1 flare.
A portion of the CME is Earth directed.
CME arrival time: Wed. March 7, 2012 .
There is a chance of a SEP (Solar Energetic Particle), or Proton event in the coming hours.
Read full report for all details and images

Check back often for current updates

 Most Recent NOAA Space Weather Alert :
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2012 Mar 05 0345 UTC
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see

What is a R3 radio blackout?

Updated CME Information :

STRONG SOLAR ACTIVITY: When the CME from today's X-flare arrives, a geomagnetic storm might already be in progress. An earlier CME is en route and nearing our planet. According to analysts at the Goddard Space Weather Lab, the cloud, which was produced by an M2-class eruption from sunspot AR1429 on March 4th, could deliver a glancing blow to Earth's magnetic field on March 6th at 04:30 UT (+/- 7 hr).

From NOAA:
IA.  Analysis of Solar Active Regions and Activity from  03/2100Z
to 04/2100Z:  Solar activity was moderate.  A long duration M2/1N
flare was observed at 04/1052Z from Region 1429 (N18E55).
Associated with the event was a 750 sfu Tenflare, Type IV Radio
Sweep, and a CME first visible in STEREO B COR 2 Imagery at 04/1210Z
(estimated speed of 840 km/s).  This region is classified as a Dkc
spot group with a Beta-Gamma-Delta magnetic configuration.  Further
analysis of the CME will be necessary as imagery becomes available,
however there appears to be a partial Earth-directed component.  A
glancing blow is possible from this event.

  SEP flux at energies above 10 MeV started to rise since around 00:00 UT today (probably resulting from the CME associated with yesterday's M2.0 flare). Crossing the threshold of an SEP event is probable in the coming hours. Protons from both CMEs are delayed due to the eastern position of the CME source region.

SDO images of todays X flare in progress

   We see here on recent STEREO B & STEREO A images that there was indeed a CME associated with today's X1.1 solar flare. At this time, it would appear that at least part of the CME is Earth directed. We will update on this CME as soon as we have more info.



  1. Your site lists this particular solar flare (from march 5th) as an X1.1
    I was curious about this because Space weather lists it as as an X5, and that the CME is in fact earth directed.

  2. An X1.1 was followed the next day by a X5 the next day.

  3. There was a X1.1 on March 5th 2012

    then there was a X5.4 & X1.3 on March 7th 2012

  4. list of X flares for March 2012
    X1.3 Flare on 3/7/2012 @ 01:14 UTC - Sunspot 1429
    X5.4 Flare on 3/7/2012 @ 00:24 UTC - Sunspot 1429
    X1.1 Flare on 3/5/2012 @ 04:09 UTC - Sunspot 1429

    We keep a running list of all M and X flares that occurs
    you can find that list in the top navigation tabs


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