Tag Archives: Catania

The Sun online and activity solar.25.10.2014

The strongest flare observed on the Sun during the past 24 hours was the X3.1 flare peaking at 21:41 UT yesterday in the Catania sunspot group 88 (NOAA AR 2192). SOHO/LASCO data demonstrate that the flare was accompanied only with a very weak and narrow CME. No geomagnetic consequences are expected. Despite the decrease in the area of the Catania sunspot group 88, 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 close to the solar central meridian, a major eruption in this active region may lead to a geoeffective CME and a proton event. A long filament in the northern hemisphere is now crossing the solar central meridian. Its possible eruption may lead to an Earth-directed CME.The Earth is currently inside a slow (around 390 km/s) solar wind flow with average (around 5 nT) interplanetary magnetic field magnitude. The geomagnetic conditions are quiet and are expected to remain so.

Equipment: Coronado 90 + Imaging Source DMK + LX75
Processing: Photoshop, Avistack 300 frames
Date: 25/10/14
Exposure 1/500 sec.

Observatory Sponli

The Sun online and activity solar

INFO FROM SIDC – RWC BELGIUM 2014 Oct 22 12:44:19

Three M-class flares were detected in the past 24 hours, all of them

produced by the Catania sunspot group 88 (NOAA AR 2192). The strongest

flare was the M8.7 flare peaking at 01:59 UT. Based on the still incomplete

SOHO/LASCO data and the absence of conspicuous eruptive signatures in the

SDO/AIA data, we conclude that there was no CME associated with this flare.

We expect flaring activity mostly on the M-level in this group, with a good

chance for an X-class flare. As the Catania sunspot group 88 approaches the

solar central meridian, a major eruption in this active region may lead to

a geoeffective CME and a proton event.The Earth is currently inside a slow

(around 460 km/s) solar wind flow with average (around 5 nT) interplanetary

magnetic field magnitude. The geomagnetic conditions are quiet and are

expected to remain so.

Three M-class flares were detected in the past 24 hours, all of them

produced by the Catania sunspot group 88 (NOAA AR 2192). The

The Sun online and solar activity. 21.10.2014

INFO FROM SIDC - RWC BELGIUM 2014 Oct 21 13:39:38

Catania sunspot group 88 (NOAA AR 2192) continues to grow and maintains the
beta-gamma-delta configuration of its photospheric magnetic field. It
produced four M-class flares in the past 24 hours, the strongest of them
being the M4.5 flare peaking at 16:37 UT. We expect flaring activity mostly
on the M-level in this group, with a good chance for an X-class flare. As
the Catania sunspot group 88 approaches the solar central meridian, a major
eruption in this active region may lead to a geoeffective CME and a proton
event. An active region at the north-east limb (no sunspots are still
visible) produced several flares including the C6.3 flare peaking at 10:58
UT today. It may produce an isolated M-class flare as well. A weak partial
halo CME (angular width around 200 degrees) was first seen in the
SOHO/LASCO C2 field of view at 19:12 UT on October 20. The CME was very
weak and disappeared before reaching the LASCO C3 field of view, so we do
not expect it to arrive at the Earth. The source region of the CME is the
eruption in the Catania sunspot group 88 (NOAA AR 2192) and in the region
to the south-west of it, starting around 18:40 UT, accompanied with coronal
dimmings and the M1.4 flare peaking at 19:02 UT. The solar wind speed is
currently high (around 640 km/s) and the interplanetary magnetic filed
(IMF) magnitude is around 7 nT. Due to elevated values of the IMF magnitude
and predominantly southward IMF direction, the K index reached 5 during one
interval yesterday evening (according to Dourbes, IZMIRAN, and NOAA).
Currently the north-south IMF component Bz is fluctuating around zero, so
we expect quiet to unsettled geomagnetic conditions (K < 4) in the coming
hours, possibly with isolated intervals of active conditions (K = 4).

The Sun online and solar activity.20.10.2014


INFO FROM SIDC - RWC BELGIUM 2014 Oct 20 13:00:17

Six sunspot groups are reported by Catania today. The main source of the
solar flaring activity is the Catania sunspot group 88 (NOAA AR 2192) that
is growing in size and complexity. Now it has beta-gamma-delta
configuration of its photospheric magnetic field. After yesterday's X1.1
flare, the strongest flare was the M3.9 flare peaking at 09:11 UT today.
This flare was not accompanied by a CME. We expect more flaring activity up
to X-level from this sunspot group. The Earth is currently inside a solar
wind flow with intermediate speeds (around 500-550 km/s). This flow might
be associated with a narrow low-latitude coronal hole that passed the solar
central meridian on October 17-18. The interplanetary magnetic field (IMF)
magnitude was elevated (up to 9 nT), and the IMF was directed predominantly
southward during the last several hours. Intervals of active geomagnetic
conditions (K = 4) were reported by Dourbes and NOAA. We expect quiet to
active geomagnetic conditions in the coming hours.

Sun online and solar activity. 10.10.2014

INFO FROM SIDC – RWC BELGIUM 2014

During last 24 hours 3 M-class and 11 C-class flares were reported, all originating from the Catania sunspot group 67 (NOAA AR 2182) which has rather simple, beta configuration of its photospheric magnetic field. The strongest flare observed was the M1.4 flare which peaked at 01:58 UT this morning. The flare was associated with the coronal wave and possibly also CME (it will be confirmed once SOHO LASCO and STEREO coronagraph data become available). We expect flaring activity of the C-class and possibly also of the M-class level. Since the source of the recent flaring activity, Catania sunspot group 67 (NOAA AR 2182) is situated rather close to the west solar limb (about S16 W49), we issue warning conditions for a proton event. The solar wind speed is still rather low and it is fluctuating around 350 km/s. Due to the sector change, observed at about 05:30 UT on October 08, the interplanetary magnetic field magnitude is elevated and amounts about 10 nT. The Bz component of the interplanetary magnetic field is fluctuating with rather long intervals of its negative value (lowest recorded value was about -8 nT). Due to the negative intervals of the Bz component of the interplanetary magnetic field we had unsettled to active geomagnetic conditions (K=4 reported by local station at Dourbes and Kp=4 reported by NOAA) during past 24 hours and we expect such geomagnetic conditions to continue in the coming hours.

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