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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Aug 19 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
19 Aug 2017	080	031
20 Aug 2017	082	021
21 Aug 2017	084	007

Bulletin

NOAA AR 2671 has again increased in size and produced C-class flares, there were four in past 24 h. The strongest one did not originate in NOAA AR 2671 though, it was a C4.4 peaking at 20:02 UT on August 18 and came from a region rotating into view from the east limb. A CME erupted in the vicinity of this region (seen at 14:24 UT on August 18 by LASCO-C2), directed to the east and will not be geoeffective. C-class (and possibly M-class) flares can be expected

No Earth directed Coronal Mass Ejections (CMEs) have been detected. Solar protons have remained at background levels over the past 24 hours.

The Earth is still inside a high speed solar wind stream, the speed is around 680 km/s with interplanetary magnetic field intensity of 7 nT. As a consequence, Kp reached 5 and the local K went up to 4. More disturbed conditions can be expected in the next 24 h.

Today's estimated international sunspot number (ISN): 051, based on 23 stations.

Solar indices for 18 Aug 2017

Wolf number Catania	///
10cm solar flux	080
AK Chambon La Forêt	037
AK Wingst	027
Estimated Ap	027
Estimated international sunspot number	041 - Based on 28 stations

Noticeable events summary

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

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