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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2014 Sep 19 1302 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
19 Sep 2014	120	023
20 Sep 2014	125	007
21 Sep 2014	127	007

Bulletin

Only minor C-class flaring activity in past 24 hours. NOAA AR 2169 produced again the strongest one (C3.4, peak 17:30 UT on September 18). All regions visible on the solar disk have a simple magnetic structure (alpha or beta configuration), so flaring levels are not expected to grow significantly. Nevertheless, a group of seemingly more complex active regions is rotating into view now. A disturbance arrived to ACE at 07:00 UT with interplanetary magnetic field magnitudes reaching 18 nT and causing active and minor storm conditions at planetary levels (Kp 4 and 5). The cause could be a glancing blow of a CME related to an M1.5 flare on September 14. The magnetic field is currently very fluctuating but slowly returning to nominal levels, more active periods may occur in the next 24 hours.

Today's estimated international sunspot number (ISN): 062, based on 15 stations.

Solar indices for 18 Sep 2014

Wolf number Catania	///
10cm solar flux	120
AK Chambon La Forêt	021
AK Wingst	010
Estimated Ap	009
Estimated international sunspot number	058 - Based on 20 stations

Noticeable events summary

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

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