Viewing archive of Thursday, 25 May 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 May 25 1341 UTC

SIDC Forecast

Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
25 May 2017	074	001
26 May 2017	073	008
27 May 2017	074	016

Bulletin

Over the past 24 hours solar activity has been low. No significant flares have been recorded. NOAA Active Region (AR) 2660 has been most active, producing two B-class flares. No Earth directed Coronal Mass Ejections (CMEs) have been detected in coronagraph observations. The greater than 10MeV proton flux remained at background levels over the past 24 hours. Solar activity is expected to remain low over the next 24 hours with a small chance for C-class flares. Solar wind speed decreased from about 475 km/s to values around 370 km/s. The total interplanetary magnetic field (IMF) strength, as recorded by the DSCOVR satellite, was around 3.5 nT. Bz fluctuated between -2 and +3 nT. Geomagnetic conditions (K Dourbes between 0 and 3; NOAA Kp between 0 and 1) were ranged from quiet to unsettled level in the past 24 hours. Solar wind speed is expected to decrease even more today. In response geomagnetic conditions are likely to experience mostly quiet to unsettled conditions today (25-May-2017 April) and tomorrow (26-May-2017). Active conditions with a small chance for minor geomagnetic storm are possible on the day three (27-May-2017) due to possible arrival of 23-May 2017 coronal mass ejection.

Today's estimated international sunspot number (ISN): 027, based on 24 stations.

Solar indices for 24 May 2017

Wolf number Catania	035
10cm solar flux	078
AK Chambon La Forêt	008
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	024 - Based on 31 stations

Noticeable events summary

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

All times in UTC

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