Viewing archive of Saturday, 16 April 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Apr 16 1232 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
16 Apr 2016	115	006
17 Apr 2016	115	007
18 Apr 2016	115	013

Bulletin

NOAA AR 2529 is now a beta-gamma region and released one C flare in the past 24 hours: a C4.1 flare which peaked at 14:30 UT on April 15. More C flares (probability 75%) are expected in the next 24 hours, with a slight chance (probability 15%) for an M flare, especially from AR 2529. Solar wind speed was near 360 km/s until around 04:30 UT on April 16, when it started rising till it reached a plateau of about 440 km/s around 05:30 UT. The magnitude of the Interplanetary Magnetic Field (IMF) varied between 2 and 11 nT. Over the past 24 hours, geomagnetic conditions have been quiet to unsettled (K Dourbes between 0 and 3; NOAA Kp between 1 and 3). Quiet to unsettled geomagnetic levels (K Dourbes < 4) are expected on April 16, 17 and the first half of April 18. Active to minor storm periods are possible in the second half of April 18, when a high speed stream associated with a positive coronal hole is expected to arrive.

Today's estimated international sunspot number (ISN): 046, based on 16 stations.

Solar indices for 15 Apr 2016

Wolf number Catania	073
10cm solar flux	112
AK Chambon La Forêt	010
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	047 - Based on 23 stations

Noticeable events summary

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

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