Thursday, November 30, 2017

The Sun Today


Solar activity was at very low levels. Decaying sunspot region NOAA 2689
was quiet and is approaching the NW limb. It has developed a filament in
its spotless trailing section. The 40 degrees long filament is rounding the
SW limb quietly. No earth-directed coronal mass ejections (CMEs) were
observed in available coronagraphic imagery. The greater than 10 MeV proton
flux was at nominal levels. 

Quiet flaring conditions are expected, with a slight chance on an isolated
C-class flare.

Solar wind speed values around 400 km/s were recorded until about 19UT,
when the wind stream associated with the southern polar coronal hole (CH)
extension arrived and gradually drove the speed to values near 510 km/s
around 09UT. Bz oscillated between +7 nT and -9 nT. The interplanetary
magnetic field was mostly directed towards the Sun. Solar wind parameters
did not show any obvious sign of the 25 November CME which has most likely
missed the Earth.

The geomagnetic field was quiet to unsettled throughout the period, with Kp
at active levels during the 03-06UT interval. Mostly quiet to unsettled
conditions are expected, with a possibility on another active episode.
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