The Sun Online and solar activity. November 7, 2013

Numerous C-class flares and three M-class flares were reported since yesterday’s bulletin, the strongest of them being the M3.8 flare peaking at 13:46 UT yesterday in the Catania sunspot group 35 (NOAA AR 1890). The trailing part of this region (containing the delta sunspot) somewhat decayed, although this active region still keeps the beta-gamma-delta configuration of its photospheric magnetic field. We expect continuing flaring activity on the M-level, with an X-class flare possible, but not very likely. Due to the current high level of the proton flux and the position of the Catania sunspot group 35 approaching the solar central meridian, a proton event is probable.

The solar wind speed is currently low (around 360 km/s). However, the interplanetary magnetic field (IMF) magnitude is elevated since the early hours of today (peak value 14 nT). The currently available data does not yet allow us to conclude if this increase is due to an interaction region with a faster flow or to an ICME. The north-south IMF component reached -9 nT and stayed negative during several hours, resulting in one interval of active geomagnetic conditions (K = 4) as reported by Dourbes, IZMIRAN and NOAA. We expect unsettled to active geomagnetic conditions in the coming hours.


Equipment: Coronado 90 + SBIG 8300s + LX75
Processing: Photoshop
Date: 07/11/13
Time GMT: 13:30
Exposure 0.12 sec.

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