Viewing archive of Sunday, 31 January 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Jan 31 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
31 Jan 2016	103	013
01 Feb 2016	101	012
02 Feb 2016	100	010

Bulletin

Over the past 24 hours solar activity has been low. The largest flare was a B9.1 class flare. NOAA Active Region (AR) 2488 (Macintosh class:Cao; Mag. type:Beta) has been most active. AR 2488 has moved on to the West limb. ARs 2489 (Dho; Beta) and 2490 have shown some low levels of activity, and exhibited small amounts of flux emergence in HMI observations. There was a filament eruption around 15:00 UT yesterday (30-Jan-2016) near the Eastern limb, the resulting CME is not expected to interact with the Earth system. No Earth directed Coronal Mass Ejections (CMEs) have been detected. A positive polar coronal hole is currently positioned in the Western hemisphere of the Sun. 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 has fluctuated between 260 and 300 km/s over the past 24 hours. The total magnetic field strength has fluctuated between 4 and 10 nT. The Bz component was largely negative, fluctuating between 0 and -7 nT. Geomagnetic conditions ranged between Kp index 0-3 (NOAA) and local K index 0-2 (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) may enhance solar wind speeds.

Today's estimated international sunspot number (ISN): 027, based on 12 stations.

Solar indices for 30 Jan 2016

Wolf number Catania	///
10cm solar flux	105
AK Chambon La Forêt	006
AK Wingst	001
Estimated Ap	001
Estimated international sunspot number	034 - Based on 15 stations

Noticeable events summary

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

All times in UTC

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