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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 May 18 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
18 May 2015	114	018
19 May 2015	107	026
20 May 2015	100	010

Bulletin

Solar activity was low. A newly numbered region in the southeast (NOAA 2349) produced the only two C flares of the period (C1 peaking at 7:53UT and 8:21UT). In addition, a new region (NOAA 2350) emerged slightly to the northwest of NOAA 2349. With NOAA 2339 departing over the West limb, the regions on disk are fairly simple and unremarkable. Essentially quiet conditions are expected with a chance for isolated C flares. No earth directed CMEs have been observed. Solar wind speed was around 400 km/s. The total magnetic field saw an increase from around 5 nT to a peak of 15 nT (currently 11-12nT). The magnetic field increase is possibly associated with the compression region in front of the expected high speed stream or with the May 13 CME. Bz was initially mostly positive but is currently pronounced negative down to -12nT. Geomagnetic conditions were quiet to unsettled (NOAA Kp 1-2, local K Dourbes 1-3). A high speed stream from an equatorial positive polarity coronal hole is expected to influence solar wind over the coming days. Active geomagnetic conditions are possible in response.

Today's estimated international sunspot number (ISN): 071, based on 15 stations.

Solar indices for 17 May 2015

Wolf number Catania	///
10cm solar flux	120
AK Chambon La Forêt	009
AK Wingst	006
Estimated Ap	006
Estimated international sunspot number	058 - Based on 25 stations

Noticeable events summary

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

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