Tag Archives: C-class flares

The Sun online and activity solar.01.11.2014

The Sun produced three C-class flares, originating from Catania sunspot groups 2 (no NOAA numbering yet) and 3 (NOAA AR 2201). A prominence eruption occurred at the SE quadrant, starting at around 3:45 UT on November 1. No coronagraphic data are available yet to verify the direction of propagation of an associated CME. However, given the source location, any effect on Earth is unlikely. Further flaring activity at the C-level is expected from Catania groups 99 (NOAA AR 2202), 2 and 3.The interplanetary magnetic field magnitude reached a maximum of 16 nT and decreased again to about 10 nT. The Bz component was mainly positive. The solar wind speed has a value of about 520 km/s, with a maximum of about 580 km/s at 8:00 UT. Quiet to active conditions are expected, with limited chances for minor storm conditions due to CH high speed stream influences.

The Sun online and solar activity.12.10.2014

INFO FROM SIDC – RWC BELGIUM 2014

The solar activity is low. The strongest of three C-class flares reportedduring last 24 hours was the C2.5 flare (peaked at 05:15 UT) on October 12.All three C-class flares originated from the NOAA AR 2187 which iscurrently situated close to the east solar limb. No Earth directed CMEswere observed in last 24 hours. The flaring activity at the C-class levelis possible, in particular from the NOAA AR 2187.The Earth is currentlyinside a slow solar wind with the speed of 340 km/s, and the interplanetarymagnetic field magnitude has the average value of about 4nT. We expectquiet to unsettled geomagnetic conditions to continue in the followinghours.

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.

Sun online. Solar activity

Solar activity is very low, with only three C-class flare reported during last 24 hours. The strongest flare was the C1.6 flare (peaked at 16:00 UT on October 07) originating from the not yet classified active region at about N15 E25. No Earth-directed CMEs were observed during last 24 hours. We expect solar activity to remain low with occasional C-class flares.ACE solar wind data indicate possible arrival of the sector boundary or ICME (solar origin is not yet understood). The sector change was observed at about 05:30 UT this morning. The Bz component of the interplanetary magnetic field is fluctuating and it had few intervals of negative value (up to – 8 nT). Simultaneously to the longest interval of negative Bz (about 4 hours) the magnitude of the interplanetary magnetic field had reached the value of about 10 nT. Currently the interplanetary magnetic field magnitude is about 4 nT and the solar wind speed is still low with the value of about 350 km/s. Due to negative intervals of Bz component of the interplanetary magnetic field we have currently active geomagnetic conditions (K=4 reported by local station at Dourbes). We expect unsettled to active geomagnetic conditions to continue in the coming hours.

Sun online.Solar activity 07.10.2014

INFO FROM SIDC – RWC BELGIUM 2014

Solar activity is low. The strongest flare reported during last 24 hours was the C1.5 flare with the peak time at 16:56 UT, on October 05. The flare originated from the Catania sunspot group 63 (NOAA AR 2177) currently situated close to the west solar limb. No Earth-directed CMEs were observed during last 24 hours. We expect C-class flares. An isolated M-class flare from the Catania sunspot group 64 (NOAA AR 2181) which has beta-gamma configuration of its photospheric magnetic field, is possible but not very probable.The solar wind speed is currently 400 km/s and the interplanetary magnetic field magnitude is about 4nT. The geomagnetic conditions are quiet and expected to remain so in the following 48 hours.

Sun online. Solar activity. 05.10.2014

05-10-2014

INFO FROM SIDC – RWC BELGIUM 2014 Oct

Four low-level C-class flares were recorded. The strongest was a C1.9

peaking at 22:15UT and produced by NOAA 2172 from behind the west limb. The

x-ray background flux has decreased below the C1-level. There are currently

8 sunspot groups visible on the solar disk. Most of them are fairly simple,

and contain a filament or are close to one. Further C-class flaring is

expected. A 20-degrees long, thin, but dynamical s-shaped filament has

rounded the southeast limb. This area seems to have been responsible for a

filament eruption on 03 October between 03:00 and 04:30UT. The associated

CME was not directed to Earth.

Solar wind speed increased from about 330 to 370 km/s. Bz was initially

fluctuating around 0 nT untill about 05:00UT, when it gradually increased

to the current +10 nT. Geomagnetic conditions were quiet to unsettled, and

are expected to remain so, with locally an active episode possible.

Sun online. 06.10.2014

INFO FROM SIDC – RWC BELGIUM 2014

The only C-class event of the period was a C1 flare peaking at 09:54UT and

produced by NOAA 2178. The 7 groups currently visible on the solar disk

have a relatively simple magnetic configuration and have been quiet.

Numerous filaments are present on the solar disk, but they are mostly small

and quiet. There remains a chance on an C-class flare. No obvious CMEs were

observed during the period.

A corotating interaction region has influenced the solar wind since late on

3 October. Around 17:00UT on 4 October, the direction of the IMF turned

towards the Sun, and solar wind speed peaked near values of 480 km/s early

on 5 October. Bz was mostly positive, fluctuating between -5 and +10 nT

during the latter half of the observation period. Geomagnetic conditions

were quiet to unsettled and are expected to remain so.

The Sun Online and solar activity. october 04.10.2014



INFO FROM SIDC - RWC BELGIUM 2014 Oct 03 12:20:19

Late on 2 October, a long duration M1.5 flare was quickly followed by a
powerful M7.3 flare, thus ending a 36 hours drought in flaring activity.
The two flares peaked resp. at 17:44UT and 19:01UT, and had their source in
the sunspot complex NOAA 2172/2173 which was rounding the west limb at that
time. The greater than 10 MeV proton flux stayed at nominal levels, and the
associated CME was directed to the southwest with no Earth-directed
component observed based on currently available imagery.
In the wake of the two medium flares, NOAA 2172/2173 produced a series of
C-class flares, the strongest being a C9.0 flare peaking at 06:48UT. The
x-ray background flux is still at the C1-level, but is expected to decrease
as the trailing portion of NOAA 2172 will have rounded the west limb later
today. The other 8 sunspot regions have a fairly simple magnetic
configuration, and have been quiet. 

C-class flaring is expected, with a small chance on an M-class flare from
behind the west limb from NOAA 2172/2173. Solar wind speed varied mostly between 350 and 400 km/s, and Bz fluctuated
between -5 and +4 nT. Geomagnetic conditions were quiet to unsettled, and
are expected to remain so.

The Sun Online and solar activity. September 15, 2014

Only minor C class flares in past 24 hours, with a C3.1 from Catania 45 (NOAA 2157, peak 00:27 UT) being the strongest one. More C-class flaring activity can be expected, with M-flares less likely.Geomagnetic conditions have been quiet and are expected to remain so, unless a CME from a filament eruption from close to disk center on September 12 arrives to the Earth in
the next 24 hours (no obvious CME could be detected).
SIDC

Equipment: Coronado 90 + Imaging Source DMK + LX75
Processing: Photoshop, Avistack 300 frames
Date: 15/08/14
Time UT: 16:00
Exposure 1/500 sec.

Observatory Sponli

The Sun Online and solar activity. September 14, 2014

There are currently 6 sunspot groups visible on the solar disk. Eight low-level C-class flares and one M-class flare were observed during the period. The latter reached a maximum of M1.5 at 02:16UT, and originated in NOAA 2157. The CME associated to this event was first observed by LASCO at 03:12UT. It had a speed of about 350 km/s (CACTus), but has no Earth-directed component. NOAA 2157 and NOAA 2158 continue their decay. However, together with NOAA 2164, they have spots of opposite magnetic polarity close to each other. Hence, they may still produce an M-class flare. Filament eruptions observed around 16:30UT (northeast quadrant) and 20:00UT (south of NOAA 2163) were not related to earth-directed CMEs.
M-class flares remain possible. Solar wind speed decreased from about 600 km/s to 500 km/s, while Bz
decreased from +15 nT to a steady +6 nT. Geomagnetic conditions were quiet and are expected to remain so.
SIDC

Equipment: Coronado 90 + Imaging Source DMK + LX75
Processing: Photoshop, Avistack 300 frames
Date: 14/08/14
Time UT: 16:00
Exposure 1/500 sec.

Observatory Sponli

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