Viewing archive of Thursday, 28 January 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Jan 28 1231 UTC

SIDC Forecast

Solar flares

C-class flares expected, (probability >=50%)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
28 Jan 2016	118	011
29 Jan 2016	119	013
30 Jan 2016	120	011

Bulletin

Over the past 24 hours solar activity has been low, but increasing. The largest flare was a C5.3 class flare. NOAA Active Region (AR) 2488 (Macintosh class:Dao; Mag. type:Beta) has been most active, producing the C5.3 class flare, which peaked at 05:23 UT. ARs 2489 (Dki; Beta) and 2490 (Dro; Beta) have shown some low level activity. ARs 2488 and 2489 have shown some evidence of flux emergence and cancellation in HMI observations, this may increase flaring activity. There is currently a large positive Northern polar coronal hole in the Western hemisphere which is expected to increase solar wind speeds. Solar activity is expected to remain low over the next 24 hours with a high probability of C-class flares and a low probability of M-class flares. The solar wind speed slowly decreased throughout yesterday (27-Jan-2016) to around 320 km/s. As we passed a sector boundary this morning at 06:00 UT the speed jumped to around 370 km/s, from which point the speed has plateaued. The total magnetic field strength has remained stable around 9 nT. The Bz component was largely positive yesterday, fluctuating between -5 and 5 nT. However, the field turned negative this morning at 06:00 UT and has remained mainly negative around -5 nT. Geomagnetic conditions ranged between Kp index 0-3 (NOAA) and local K index 0-3 (Dourbes) over the past 24 hours. A positive polar coronal hole is currently positioned in the Western hemisphere of the Sun and the resulting high-speed stream (HSS) is expected to enhance solar wind speeds today and tomorrow, with a negative Bz this may increase geo-activity over the next couple of days.

Today's estimated international sunspot number (ISN): 069, based on 13 stations.

Solar indices for 27 Jan 2016

Wolf number Catania	099
10cm solar flux	113
AK Chambon La Forêt	005
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	080 - Based on 15 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

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