The CME associated with the March 10, 2012 M8.4 solar flare has arrived. At 08:54 UTC ACE detected the shock of the incoming CME. The SWPC originally forcasted the arrival time of this CME March 12th around 1800 UTC. At this time the CME impact is stirring up a G2 (moderate) geomagnetic storm. Conditions are expected to continue through today as the bulk of the CME passed Earth as the bulk of the CME passes Earth. Solar wind speeds have been recorded as high as 774.8 km/sec and Density as high as 51.9 protons/cm
View original report on the M8.4 LDE flare + CME here:
http://mysolaralerts.blogspot.com/2012/03/m84-lde-solar-flare-at-sunspot-region.html
Issue Time: 2012 Mar 12 0854 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2012 Mar 12 0915 UTC
Valid To: 2012 Mar 12 1015 UTC
IP Shock Passage Observed: 2012 Mar 12 0842 UTC
Be sure to check back often for further updates and alerts on this event.
All updates will be added to the bottom of this report.
With geomagnetic storming expected over the following hours, an aurora watch for high and mid latitudes is in effect for March 12, 2012.
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Geomagnetic Storm Levels and Effects - List
http://www.swpc.noaa.gov/NOAAscales/#GeomagneticStorms
Update 18:14 UTC March 12, 2012:
There seams to be a fair amount of confusion floating around about the last 2 CME arrivals. Are they the two we have been expecting? Why are they not arriving when forecasted to arrive? Are we still expecting the CME associated with the March 10, 2012 M8.4 flare? We have put together the following in an attempt to help make the answers to these questions a bit more clear.
We are confident that on March 11, 2012 we saw the arrival of the 1st expected CME produced on March 9, 2012 in association with the M6.3 solar flare.
We are also confidant we are now seeing the arrival of the CME produced on March 10, 2012 in association with the M8.4 solar flare.
We base this on the ejection time & ejection speed of both CME's, as well as the Goddard Space Weather Lab CME arrival forecast that is posted directly after the events.
The March 9th M6.3 Flare + CME:
-estimated ejection speed of 750 km/s
-expected arrival time for the CME is on March 11, 2012 around 06:49UTC (+ or - 7hrs.)
-time we saw arrival - March 11 2012, at 11:59 UTC
http://mysolaralerts.blogspot.com/2012/03/cme-arrival-from-march-9th-m63-solar.html
(5hrs after the estimated arrival time, there was a +/- of 7hrs on this CME arrival. This CME arrived within the expected arrival window)
-Spaceweather report on this CME arrival:
"
CME IMPACT (MORE TO COME): An interplanetary shock wave buffeted Earth's magnetic field on March 11th at 11:59 UT. It was probably the first of two CMEs expected to arrive today."
http://spaceweather.com/archive.php?view=1&day=11&month=03&year=2012
The March 10th M8.4 Flare + CME:
-estimated ejection speed between 1200 - 1400 km/s.
-expected arrival time for the CME is on March 12, 2012 around 18:00UTC (+ or - 6hrs.)
-time we saw arrival - March 12 2012, at 08:54 UTC
http://mysolaralerts.blogspot.com/2012/03/cme-arrival-from-march-10th-m83-solar.html
(9hrs before the estimated arrival time, there was a +/- of 7hrs on this CME arrival. This CME arrived 2hrs before the expected arrival window)
-Spaceweather report on this CME arrival:
"
WEEKEND SOLAR FLARE: Sunspot AR1429 is still erupting this weekend. On Saturday, March 10th, it produced a powerful M8-class flare that almost crossed the threshold into X-territory."
"In addition, the explosion propelled yet another CME toward Earth. According to a forecast track prepared by analysts at the Goddard Space Weather Lab, the cloud will hit our planet's magnetosphere on March 12th at 1803 UT (+/- 7 hr), possibly sparking a new round of geomagnetic storms."
http://spaceweather.com/archive.php?view=1&day=11&month=03&year=2012
GEOMAGNETIC STORM UNDERWAY: A moderate
G2-class geomagnetic storm is
underway following the arrival of a CME on March 12th at ~0930 UT.
http://spaceweather.com/archive.php?view=1&day=12&month=03&year=2012
Update 18:09 UTC March 12, 2012:
Solar winds are remaining in the 700km/sec range. With the Bz remaining in the positive range this is keeping the Kp index at a Kp6 (a G2 geomagnetic storm). If the Bz turns south into a negative range with the solar winds remaining at over the 700km/sec range, a G3 storm could be produced. We will keep monitoring this situation and report any significant changes.
ACE Conditions @ 18:07 UTC
March 12, 2012
Solar Wind Speed: 774.8 km/sec
Density: 1.0 protons/cm
Bz: +3.4
By: +9.1