Tag Archives: Catania sunspot

The Sun online and activity solar.29.10.2014

солнце 29 октября

Solar activity has slightly reduced in the past 24 hours, with three M-class and two C-class flares. Activity mainly originated from  Catania sunspot group 88 (NOAA AR 2192). A narrow CME was observed in SOHO/LASCO-C2 imagery (first measurement at October 28 20:24 UT), with a projected speed of 388 km/s (CACTus estimate). The CME is travelling to the northeast of the Sun-Earth line. The CME is believed to be associated with activity at the backside of the Sun and as such no effect on Earth is expected. Catania group 88 still has potential to produce strong flares up to the X-level. Due to it’s location close to the West limb, a strong eruption may result in a rise of the proton flux. Earth is currently inside a slow solar wind, with solar wind speed decreasing from 450 km/s to currently around 350 km/s. The interplanetary magnetic field has a magnitude of about 5 nT with fluctuating Bz values. Quiet geomagnetic conditions are observed and are expected to continue.

The Sun online and activity solar.28.10.2014



Another X-class flare was produced by Catania sunspot group 88 (NOAA AR 2192); an X2.1 flare peaked at 14:47 UT on October 27. Also three M-class and several C-class flares were added to the activity list of this region. No associated CME was observed, nor was there an increase in proton flux. The region Lf-nh7 retains its area and magnetic complexity and has still high potential to produce additional flares up to the X-level. It is currently located close to the West limb and a strong eruption may result in a rise of the proton flux.  The extended filament in the northern hemisphere has the potential to lift off and produce an Earth-directed CME.  Earth is inside a slow solar wind, with a speed near 400 km/s. The interplanetary magnetic field magnitude reaches values up to 8 nT, with an often southward oriented Bz. Mostly quiet geomagnetic conditions are observed, with a few isolated time slots of active (K=4, measured at Dourbes) conditions. Quiet to active conditions are  expected to continue.

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 28/10/14
Exposure 1/500 sec.


The Sun online and activity solar.26.10.2014



In the past 24 hours, Catania sunspot group 88 (NOAA AR 2192) produced two
X-class flares: X1.0 peaking at 17:08 UT yesterday and X2.0 peaking at
10:56 UT today. Neither of the flares seems to be associated with an
Earth-directed CME. The area of the Catania sunspot group 88 increases
again, and it maintains the beta-gamma-delta configuration of its
photospheric magnetic field, so we expect the flaring activity up to
X-level from this sunspot group. As the Catania sunspot group 88 is
currently situated in the western solar hemisphere, a major eruption in
this active region may lead to a proton event. A long filament in the
northern hemisphere is continuing its passage across the solar central
meridian. Its possible eruption may lead to an Earth-directed CME. The
Earth is currently inside a slow (around 370 km/s) solar wind flow with
slightly elevated (around 7 nT) interplanetary magnetic field magnitude.
The geomagnetic conditions are quiet and are expected to remain  so, with
isolated intervals of active (K = 4) geomagnetic conditions possible but
not very likely.

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 26/10/14
Exposure 1/500 sec.

Observatory Sponli