Earth is entering a minor solar wind stream that could spark auroras around the Arctic Circle. High-latitude sky watchers should be alert for Northern Lights tonight.
speed: 452.2 km/sec
density: 1.5 protons/cm3
The Radio Sun
10.7 cm flux: 140 sfu
Now: Kp= 2 quiet
24-hr max: Kp= 2 quiet
Interplanetary Mag. Field
Btotal: 5.0 nT
Bz: 2.9 nT south
A very large solar filament channel that measures longer than 300,000 miles, is currently visible across the entire northeast quadrant. Click on the image below to view.
Solar activity was at very low levels with only B-class activity observed. Two filament eruptions were observed during the period. A 40 degree long filament, centered near N25E25, was first observed erupting at about 11/0600Z. Shortly after, a 10 degree long filament, centered near N30W17, was first observed lifting off at about 11/0900Z. Stereo-A COR2 imagery observed a pair of CMEs off the NE limb at 11/0754Z and 11/1024Z as a result of the filament activity. At this time, neither of these CMEs are expected to be geoeffective. Solar activity is expected to be at low levels with a slight chance for M-class activity all three days of the period (12 – 14 December).
The geomagnetic field was at quiet to unsettled levels. Solar wind velocities generally varied between 450 to 500 km/s while the Bz component of the interplanetary magnetic field did not vary much beyond +/- 5 nT. The geomagnetic field is expected to be at mostly quiet levels all three days of the period (12 – 14 December).
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