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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Jul 24 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
24 Jul 2017	070	015
25 Jul 2017	070	011
26 Jul 2017	070	008

Bulletin

Solar activity was at very low levels during the period. The visible solar disk is spotless. A bright faculae field rotated over the east limb. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

Quiet flaring conditions are expected.

The earth environment remained under the influence of the high speed stream (HSS) from a positive polarity coronal hole (CH). Wind speeds gradually increased from an initial value near 560 km/s to about 700 km/s by 04UT, then decreased again to 600 km/s by the end of the period. Bz oscillated between -6 and +5 nT. The interplanetary magnetic field was directed away from the Sun.

The geomagnetic field was at quiet to unsettled levels, with an active episode during the 21-24UT interval recorded by both Dourbes and in Kp. Mostly quiet to unsettled geomagnetic conditions are expected, with a chance on another active episode as the influence of the CH HSS is expected to gradually subside over the next 1-2 days.

Today's estimated international sunspot number (ISN): 000, based on 18 stations.

Solar indices for 23 Jul 2017

Wolf number Catania	///
10cm solar flux	071
AK Chambon La Forêt	026
AK Wingst	016
Estimated Ap	017
Estimated international sunspot number	000 - Based on 31 stations

Noticeable events summary

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

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