Viewing archive of Wednesday, 26 July 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Jul 26 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
26 Jul 2017	070	014
27 Jul 2017	070	014
28 Jul 2017	070	008

Bulletin

Solar activity was at very low levels during the period. Sunspot region NOAA 2668 is decaying and barely visible. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux reached a maximum of about 2 pfu (i.e. below the 10 pfu event threshold) around 21-22UT, and is now gradually declining.

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 570 km/s to about 660 km/s by 03UT, then decreased to 590 km/s by the end of the period (DSCOVR). Bz oscillated between -5 and +7 nT. The interplanetary magnetic field was mostly directed away from the Sun, with a "towards" sector during the 14-22UT interval.

The geomagnetic field was at quiet to unsettled levels, with an active episode during the 06-09UT interval recorded by both Dourbes and in Kp. Mostly quiet to unsettled geomagnetic conditions are expected, with a chance on another active episode under the persistent influence of the CH HSS.

Today's estimated international sunspot number (ISN): 000, based on 14 stations.

Solar indices for 25 Jul 2017

Wolf number Catania	000
10cm solar flux	070
AK Chambon La Forêt	019
AK Wingst	013
Estimated Ap	013
Estimated international sunspot number	000 - Based on 32 stations

Noticeable events summary

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

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