Daily Archives: November 29, 2013

The Sun Online and solar activity. November 29, 2013

NOAA AR 1907 and 1908 were responsible for the C-flaring activity today November 29 and yesterday, November 28. We expect more C-flares. NOAA AR 1909 is also in the running for C-flaring activity.
Solar wind speed is below 300 km/s. The slow wind carries an average total interplanetary magnetic field (IMF) below 10nT. The earth entered another sector causing unsettled geomagnetic conditions on the planetary level (Kp=3). Further we expect quiet geomagnetic conditions for the rest of the UT day. Tomorrow, November 30, a glancing blow of the filament eruption of November 27 is possible.

INFO FROM SIDC
Equipment: Coronado 90 + SBIG 8300s + LX75
Processing: Photoshop
Date: 11/29/13
Time UT: 14:30
Exposure 0.8 sec.

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Comet ISON Before and After

ISONperihelionLASCOc2

Image Credit: NASA, SOHO

Sungrazing Comet ISON reached perihelion, its closest approach to the Sun, yesterday, November 28, at 18:45 UT. The comet passed just over 1 million kilometers above the solar surface, a distance less than the diameter of the Sun. These two panels follow ISON before (right) and after its close approach, imaged by the LASCO instrument onboard the Sun staring SOHO spacecraft. Overwhelming sunlight is blocked by LASCO’s central occulting disk with a white circle indicating the Sun’s positon and scale. The bright comet is seen along its path at the bottom of the before panel, but something much fainter exits near the top of the after panel, potentially a dust tail reforming from the debris left from ISON’s perihelion passage.

The Sun Online and solar activity. November 28, 2013

Two C-class flare sin past 24h. NOAA AR 1906 produced a C1.4 flare peaking at 00:41 UT, the other one was seen from behind the west limb. More C-class flares can be expected. A partial halo CME was seen by LASCO-C2 at 15:13 UT on November 27, related to a filament eruption in the northern hemisphere. This eruption is mostly directed to the north, but a glancing blow to the Earth is possible. The calculated speed is 540 km/s, giving a probable arrival on November 30 around 17:00 UT. Solar wind speed is very low (260 km/s) with magnetic field around 5nT.
Geomagnetic conditions have been quiet and are expected to remain so.

INFO FROM SIDC
Equipment: Coronado 90 + SBIG 8300s + LX75
Processing: Photoshop
Date: 28/11/13
Time GMT: 18:00
Exposure 0.12 sec.
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