Tag Archives: low solar activity

Sun online.Solar activity 07.10.2014

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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.

The Sun Online and solar activity. August 21, 2014

We expect continued C-class flaring activity from several active regions on the disc. A new -yet unnumbered- active region has crossed the solar NE limb and might boost solar activity further in the coming days. Quiet geomagnetic conditions are expected in the coming 3 days: there are no high speed wind streams expected from coronal holes, nor are there any new CMEs on the way to the Earth.
SIDC

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 08/21/14
Time UT: 16:00
Exposure 1/500 sec.

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The Sun Online and solar activity. August 19, 2014

Solar activity has been low with just two C flares at the start of the reporting period. The largest one was a C1.8 originating from NOAA AR 2147, peaking at 13:55 UT. The other one a C1.2 flare from NOAA AR 2139 peaking at 16:56 UT. No earth directed CME’s have been recorded. Solar activity is expected to remain at similar low levels over the next days. Solar wind conditions were steady and nominal until the arrival of a moderate shock this morning around 6:00 UT. Solar wind speed has increased since then from 290 km/s before the shock to around 380 km/s at present with a peak above 430 km/s in between. Total magnetic field increased from around to 7 nT to around 12nT presently with peaks above 13 nT. Bz was variable, mostly positive but with negative values peaking around -11nT. Temperature and density have also increased. The conditions are likely due to an earlier then expected arrival of the August 15 CME. Geomagnetic conditions remained quiet to unsettled so far (NOAA Kp mostly 1 but reaching K=3 just recently and local K Dourbes at most 2). Under the continued influence of the CME arrival, elevated solar wind conditions and periods of active geomagnetic conditions should be anticipated during the
following day, with minor geomagnetic storm conditions possible. These will settle afterwards to unsettled and quiet to unsettled conditions.
SIDC

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 08/19/14
Time UT: 16:00
Exposure 1/500 sec.

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The Sun Online and solar activity. August 17, 2014

No C flares were registered during the past 24 hours. In the next 48 hours, eruptive conditions (C flaring) are possible, especially from beta-gamma regions NOAA AR 2144 and 2139.Over the past 24 hours, solar wind speed as observed by ACE was stable around 280 km/s until it jumped to a plateau of
about 300 km/s around 23h UT on August 16. Meanwhile, the magnitude of the Interplanetary Magnetic Field (IMF) increased from about 2 to 8 nT. Over the past 24 hours, geomagnetic conditions were quiet (K Dourbes between 0 and 2; NOAA Kp between 0 and 2). Quiet geomagnetic levels (K Dourbes < 4)
are expected on August 17, 18 and 19. The expected arrival of the halo CME of August 15 at the end of August 19 may induce active geomagnetic conditions.
SIDC

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 08/17/14
Time UT: 16:00
Exposure 1/500 sec.

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The Sun Online and solar activity. August 14, 2014

There were no C flares during the past 24 hours. In the next 48 hours, quiet conditions (B flaring) are expected, with a slight chance for a C flare from NOAA AR 2139 and 2135.Over the past 24 hours, solar wind speed as observed by ACE decreased from about 430 to 360 km/s, while the magnitude of the Interplanetary Magnetic Field (IMF) varied between 2 and 4 nT. Near 1h UT on August 14, the IMF phi angle changed from negative (towards) to positive (away). Over the past 24 hours, geomagnetic conditions were quiet (K Dourbes between 0 and 3; NOAA Kp between 1 and 2). Quiet geomagnetic levels (K Dourbes < 4) are expected on August 14, 15 and 16.
SIDC

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

Observatory Sponli

  

The Sun Online and solar activity. August 10, 2014

Flaring activity remains at a low level. NOAA AR 2137 was numbered yesterday and shows flux emergence. This region, and NOAA AR 2135, produced flares at the high B-level in the past 24 hours. A C-class flare is possible from both regions. No earth-directed CMEs were observed since our last bulletin. We expect the current quiet geomagnetic conditions to persist in the coming days, with the chance for an isolated unsettled period (K=3). Unsettled to at most active geomagnetic conditions are
possible starting August 13, under the influence of a small coronal hole that is currently passing the central meridian.
SIDC

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 08/10/14
Time UT: 16:00
Exposure 1/500 sec.

Observatory Sponli

  

The Sun Online and solar activity. July 25, 2014

Solar activity has been mostly quiet except for Catania group 22 (NOAA AR 2121) which did produce another C2 flare peaking at 7:02 UT. The background X-ray flux rose slightly to around the B3 level. Similar conditions (essentially quiet but with a significant chance for an occasional low level C flare) are expected to continue with an increasing C flare probability as some returning active regions are turning into view over the next days. These will eventually also raise a slight chance for M level flares.
No Earth directed CME’s have been observed.After reaching maxima of just over 400km/s at the start of the reporting period, solar wind speed decreased to a minimum of about 310 km/s and later increased again gradually to values presently about 360 km/s. The total magnetic field varied essentially in the 2 to 6.5 nT range with Bz also variable in the +-6nT range. Geomagnetic conditions were quiet to unsettled (local K Dourbes 2-3 and NOAA Kp 1-3). Similar solar wind conditions as well as geomagnetic conditions (quiet to unsettled) are expected to continue over the next days.
SIDC

 

The Sun Online and solar activity. July 23, 2014

Solar activity has remained quiet with background X-ray flux close to the B2 level and an occasional moderate B flare (A B5.7 flare from Catania group 22 / NOAA AR 2121 peaking at 5:42 UT and a B5.5 flare from Catania group 20 / NOAA AR 2019 peaking at 7:42 UT). Without significant further development of the active regions presently on disc, quiet solar conditions are expected to continue, and the all quiet alert is maintained. A partial halo CME with an angular width of close to 180 degrees (underestimated by Cactus as 118 degrees) was visible in SOHO/LASCO C2 from 18:00UT July 22 onwards. The mass was expelled in north-western direction from the Sun Earth line. Coronal imagery (PROBA2/SWAP, SDO/AIA, as well as STEREO A EUVI) shows the event to originate from at or just around the western limb at a latitude of around 30 degrees North. Consequently no influence on Earth is expected.Solar wind speed has dropped gradually from its slightly enhanced values at the start of the reporting period (around 350 km/s) to just over 300 km/s presently. The total magnetic field was within the 3-5nT range with variable Bz within the +/-4nT range. Geomagnetic conditions were mostly quiet (NOAA Kp 1-2) with a short period of local unsettled conditions just after UT noon July 22 (K Dourbes 3 returning to 2 afterwards and 0-1 presently). Nominal solar wind conditions and associated quiet geomagnetic conditions are expected to continue over the next days.
SIDC

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 07/23/14
Time UT: 16:00
Exposure 1/500 sec.

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The Sun Online and solar activity. July 22, 2014

Solar activity has been very low over the past 24 hours. Background X-ray flux was around the B2 level, with an occasional B flare (the strongest peaking at B5.9 level at 18:48 UT). Catania sunspot group 20 (NOAA AR 2019) showed no significant growth that would require increasing it’s C flaring probability, while the new sunspot group 22 (NOAA unnumbered) does raise the full disc C flare potential. We nevertheless presently maintain the all quiet alert. No significant CME’s were observed.
Solar wind values became slightly enhanced around UT midnight, fluctuating since then in the 300-360 km/s range. The onset of that period was accompanied by a local maximum of the total magnetic field of over 8 nT, but it has declined continuously since then to around 4 nT presently. Bz was variable within that range. Geomagnetic conditions were quiet with local K Dourbes and NOAA Kp in the 1-2 range.
Nominal solar wind conditions and associated quiet geomagnetic conditions are expected over the next  days.
SIDC

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 07/22/14
Time UT: 16:00
Exposure 1/500 sec.

Observatory Sponli

  

The Sun Online and solar activity. July 21, 2014

Solar activity has been quiet in the last 24 hours with the background X-ray flux steady around the B2 level. Only a couple of minor B flares have occurred. The largest was a B3.4 flare peaking around 8:47 UT associated with the unnumbered active region that is about to turn onto the visible  solar disc from behind the East limb. There are currently only three active regions on the solar disc. NOAA AR 2018 and 2020 are stable alpha regions while the beta region 2019 does show signs of further development.
No significant CME’s were reported. Quiet conditions are expected to continue with only a slight chance on flaring at C level. The all quiet alert is presently maintained but this may need to be revised if NOAA AR 2019 continues to grow and depending on the nature of the active region(s) that are turning onto the disc from behind the East limb.Solar wind speed remained at low levels around the 280 km/s, while the interplanetary magnetic field increased to around the 6 nT level with Bz varying and currently reaching levels of around -4nT. Geomagnetic conditions were quiet with local K Dourbes and NOAA Kp in the
0-2 range. Quiet conditions are expected to continue although some influence of a coronal hole high speed stream can possibly cause enhanced solar wind conditions and associated unsettled geomagnetic conditions in the next 24 to 48 hours.
SIDC

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop
Date: 07/21/14
Time UT: 16:00
Exposure 1/500 sec.

Observatory Sponli