THE SUN NOW 15 mar 2013

CME IMPACT: As expected, a coronal mass ejection (CME) hit Earth’s magnetic field on March 15th at approximately 0500 UT. The impact was weak, but conditions for geomagnetic storming could develop as Earth passes through the CME’s wake. High latitude sky watchers should be alert for auroras on March 15th and 16th.

POSSIBLE EARTH-DIRECTED CME: A magnetic filament snaking around sunspot AR1692 erupted on March 15th at about 0600 UT. The slow explosion, which took hours to unfold, produced an M1-class solar flare and a bright CME. SOHO (the Solar and Heliospheric Observatory) captured the CME just as it was leaving the sun:

The central location of the explosion combined with multiple views of the CME from SOHO and NASA’s twin STEREO spacecraft suggest that the cloud is heading almost directly toward Earth. If so, an impact would likely occur in 2 to 3 days, setting the stage for weekend auroras. Stay tuned for refined estimates of the arrival time.

Solar wind
speed: 437.4 km/sec
density: 4.2 protons/cm3

X-ray Solar Flares

6-hr max: C9 0747 UT Mar15 

24-hr: M1 0703 UT Mar15 

Sunspot number: 133 

SRS Number 74 Issued at 0030Z on 15 Mar 2013
Report compiled from data received at SWO on 14 Mar
I. Regions with Sunspots. Locations Valid at 14/2400Z
Nmbr Location Lo Area Z LL NN Mag Type
1689 S18W69 155 0030 Cro 08 04 Beta
1690 N25W36 122 0010 Bxo 02 02 Beta
1691 N13W39 125 0120 Dao 08 08 Beta
1692 N09E09 077 0200 Hsx 03 02 Alpha
1694 N15E11 075 0020 Hrx 01 01 Alpha
1695 N09E31 055 0160 Hsx 02 01 Alpha
1696 N05W09 095 0150 Eai 12 15 Beta-Gamma
1697 N15W22 108 0030 Cro 05 04 Beta
1698 S20W29 115 0020 Cro 03 06 Beta
IA. H-alpha Plages without Spots. Locations Valid at 14/2400Z Mar
Nmbr Location Lo
1687 N08W79 165
1693 N18W88 174
II. Regions Due to Return 15 Mar to 17 Mar
Nmbr Lat Lo

The Radio Sun

10.7 cm flux: 123 sfu