Monthly Archives: September 2013

The Sun Online and solar activity. September 28, 2013

X-ray background radiation is in the B-level. No C-flares occurred. Catania sunspot group 83/NOAA AR 1850 has the potential of producing a C-flare. It is located between 30° and 45° longitude.
A large filament (longitudinal, between 5° and 30°) passed the central meridian. Up to now, it seems to be stable.Two coronal holes (CH) are visible on the solar disk: a small northern CH (between 35° and 50°
latitude, 20° wide) crossed the central meridian on September 27 and a small equatorial CH (between 5°S and 5°N, 10° wide) that crosses the central meridian today. Unsettled geomagnetic conditions are possible from October 1-2. The geomagnetic conditions are quiet at the moment.

(Info from Royal Observatory of Belgium).

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Date: 28/09/13
Time GMT: 13:00
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The Sun Online and solar activity. September 27, 2013

Flaring activity is in the B-level. We don’t expect it to change. A large filament is now at the central meridian. It is stable up to now. A coronal hole in visible in the northern hemisphere between 35° and 50° latitude, around 25° wide. It reached the central meridian yesterday, September 26. The coronal hole is not recurrent. Geomagnetic influence is
possible in 2-3 days.
At the moment, the geomagnetic conditions are quiet.

(Info from Royal Observatory of Belgium).

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Date: 27/09/13
Time GMT: 15:00
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The Sun Online and solar activity. September 26, 2013

The Sun is quiet when it comes to flaring activity. NOAA AR 1850/Catania 83 produced a few B-flares. We expect that the X-ray radiation stays at a low level. The solar wind speed peaked on September 25 around 450 km/s and
decreased slowly to a speed of 350 km/s today, September 26. Late September 25, the Earth crossed a sector boundary (SB). The interplanetary magnetic field changed from an inward to an outward
direction, the density of the solar wind plasma has changed slightly. The SB crossing did not have geomagnetic consequences. A small northern coronal hole (between 35° and 50° latitude) will pass the central meridian today, September 26. We expect the geomagnetic conditions to stay quiet for the next 48 hours.

(Info from Royal Observatory of Belgium).

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Date: 26/09/13
Time GMT: 16:30
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The Sun Online and solar activity. September 25, 2013

NOAA active region 1846/ Catania 79 produced a C1.1 flare on September 24. Although the chances for more C-flares are small, we end the all-quiet-alert.
ACE data show now a clear coronal hole signature. The solar wind plasma has a speed just below 450 km/s. It took this plasma around 4 days to bridge the distance Sun-Earth. On September 20, a northern coronal hole passed the central meridian. The co-rotating interaction region (CIR) followed by a fast wind measured by ACE, is probably linked to this hole. The CIR was responsible for 1 interval of Kp=4 on September 24. We expect quiet geomagnetic conditions, with Kp below 3.

(Info from Royal Observatory of Belgium).

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Date: 25/09/13
Time GMT: 14:00
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The Sun Online and solar activity. September 24, 2013

NOAA Active Region 1850 – Catania sunspot region nr 83 was the source of 4 B-flares yesterday and today. The X-ray background radiation is near the bottom of the B-level. We can conclude that flaring activity was low. We don’t expect it to rise dramatically.

The magnetic field changed direction on September 23. ACE data show today, September 24 an interaction region between a slow and fast solar wind. The total interplanetary magnetic field (IMF) and the density increased. Since the Bz component of the IMF has values below -5nT, the geomagnetic field
can slightly be disturbed resulting in possible active conditions: K=4.
(Info from Royal Observatory of Belgium).

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Date: 24/09/13
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The Sun Online and solar activity. September 23, 2013

The X-ray background radiation decreased near the bottom of the B-level. The probability for a C flare is low. The geomagnetic conditions are quiet: the total magnetic field is around 5 nT. The solar wind speed is below 400 km/s. Astronomers expect the quiet geomagnetic conditions to continue (Info from Royal Observatory of Belgium).

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Date: 23/09/13
Time GMT: 16:00
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The Sun Online and solar activity. September 22, 2013

Solar activity decreased even more, there was not C-class flares reported during last 24 hours. For out of nine numbered sunspot groups on the solar disc have beta configuration of its photospehric magnetic field, therefore the C-class flares are still possible.The solar wind speed is about 420 km/s, and the interplanetary magnetic field magnitude is about 3 nT.

The geomagnetic conditions are at the moment quiet. We expect quiet to possibly active geomagnetic conditions in the following 48 hours due to the arrival of a fast flow (associated with the low-latitude coronal hole in the northern hemisphere) and the CME associated with the prominence eruption from September 19.
INFO from Royal Observatory of Belgium.

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Date: 22/09/13
Time GMT: 16:00
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The Sun Online and solar activity. September 21, 2013

Solar activity is still low with the flaring at the C-class level. The strongest flare reported was C3.8 flare, peaking at 12:03 UT on September 20. All the C-class flares, in last 48 hours originated from the same NOAA AR 1850 which still has potential to produce C-class, and possibly M-class
flares. Earth is inside the slow solar wind with the speed of about 410 km/s.

The interplanetary magnetic field magnitude is stable having value of about 5 nT. The geomagnetic conditions are at the moment quiet. We expect quiet to active geomagnetic conditions in the following 48 hours due to the arrival of a fast flow (in the morning of September 22), associated with the low-latitude coronal hole in the northern hemisphere. The CME associated with the prominence eruption from September 19 is expected to arrive at the Earth on September 23.

INFO from Royal Observatory of Belgium

Local time:9/21/2013 at 11:40:23

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Date: 21/09/13
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The Sun Online and solar activity. September 20, 2013

Solar events:

There are currently nine numbered sunspot groups on the solar disc.
Three low C-class level flares were reported during last 24 hours
The solar wind speed is about 480 km/s
The interplanetary magnetic field magnitude is stable amounting about 3 nT.

The geomagnetic conditions are quiet. Astronomers of Royal Observatory of Belgium expect quiet to active geomagnetic conditions in the following 48 hours due to the arrival of a fast flow (in the morning of September 22), associated with the low-latitude coronal hole in the northern hemisphere.

Local time:9/20/2013 at 8:43:29

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Date: 20/09/13
Time GMT: 13:00
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The Sun Online and solar activity. September 19, 2013

The prominence eruption, from the Catania sunspot group 76 (NOAA AR 1845), at about 03:44 UT today, was associated with coronal dimming, EIT wave and a partial halo CME. The CME was first observed in the SOHO/LASCO C2 field of view at about 03:48 UT, had angular width of about 180 degrees and projected speed around 300 km/s. From the currently available data it seems
that the CME was earth-directed. We expect the arrival of the CME at the Earth on September 23. It might result in active geomagnetic conditions.

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Date: 19/09/13
Time GMT: 18:30:00
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