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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Jul 20 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
20 Jul 2017	072	006
21 Jul 2017	071	016
22 Jul 2017	071	013

Bulletin

A C1.2 flare peaking at 00:02UT was recorded off the SouthWest Solar limb, apparently still related to NOAA region 2665, which is by now already well past the limb. With no spotted regions on disk the probability for C flares is very low over the next days. SDO/AIA 304 shows a filament eruption in the Southern hemisphere from 03:13UT onwards. There are no significant related signatures of this event in coronagraph data, and it is thus expected not to influence Earth. Proton flux levels are at background values and are expected to remain so.

Solar wind was nominal for most of the period with solar wind speed declining to values around 380 km/s and total magnetic field mostly under 4nT. The magnetic field phi angle switched back and forth three times as some expected sector boundary crossings occurred. The phi angle now indicates outward magnetic field orientation. Over the past hours, temperature as well as total magnetic field have been rising (to around 8nT presently) which could mark the first signs of the influence of the extension of the positive polarity northern polar coronal hole. Under the influence of the extension of the northern polar coronal hole solar wind speed may increase over the next few days. Geomagnetic conditions were quiet (local K Dourbes and NOAA Kp 1-2) and are expected to become quiet to unsettled with possibly some isolated active periods depending on the strength of the expected coronal hole influence.

Today's estimated international sunspot number (ISN): 000, based on 27 stations.

Solar indices for 19 Jul 2017

Wolf number Catania	000
10cm solar flux	073
AK Chambon La Forêt	007
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	000 - Based on 33 stations

Noticeable events summary

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

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