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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 Sep 10 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Protoni solari

Quiet

	10cm flux	Ap
10 Sep 2018	070	009
11 Sep 2018	069	024
12 Sep 2018	069	013

Bulletin

Solar activity was very low with X-ray flux below B level throughout the period. The only region on disk (NOAA AR 2721) is in decay phase. A prominence erupted from the southwest limb of the Sun, yesterday morning, as observed by SDO/AIA 171 imagery. Event is not detected by LASCO/SOHO coronagraph imagery due to significant data gaps. The greater than 10MeV proton flux remained at background levels over the past 24 hours. Solar activity is expected to remain at very low levels. Solar wind speed varied from 450 and 370 km/s (DSCOVR). Bz varied between -5 and +5 nT. Solar wind parameters are expected to become enhanced later today due to the influence of a co-rotating intercation region followed by the influence of a positive polarity coronal hole high speed stream. Solar wind data from previous rotations and STEREO-A suggest maxium level of solar wind speed around 600 km/s. The geomagnetic field was mostly quiet. The geomagnetic field is expected to reach active levels later today. Minor (Kp = 5) and even moderate geomagnetic storm (Kp = 6) can be also expected tomorrow.

Today's estimated international sunspot number (ISN): 011, based on 16 stations.

Solar indices for 09 Sep 2018

Wolf number Catania	///
10cm solar flux	068
AK Chambon La Forêt	011
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	015 - Based on 25 stations

Noticeable events summary

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

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