Viewing archive of Sunday, 25 September 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Sep 25 1230 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
25 Sep 2016	083	016
26 Sep 2016	084	029
27 Sep 2016	085	014

Bulletin

Solar activity was very low. The Sun produced no C flares in the past 24 hours. Low solar activity (C flaring) is possible in the next 24 hours, especially from beta-gamma region NOAA AR 2597. Solar wind speed measured by DSCOVR varied between about 350 and 390 km/s. Meanwhile the magnitude of the Interplanetary Magnetic Field increased from about 3 nT to current levels of around 11 nT. Quiet to active geomagnetic conditions (K Dourbes between 2 and 4, NOAA Kp between 1 and 5) were registered in the past 24 hours. Quiet to unsettled levels (K Dourbes < 4) are expected on September 25, with a chance for active episodes (K Dourbes = 4). Quiet to active levels (K Dourbes < 5) are expected on September 26 and 27 due to the expected arrival of a positive high speed stream associated with a negative coronal hole, with a chance for minor storm episodes (K Dourbes = 5).

Today's estimated international sunspot number (ISN): 028, based on 19 stations.

Solar indices for 24 Sep 2016

Wolf number Catania	///
10cm solar flux	085
AK Chambon La Forêt	021
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	055 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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