Viewing archive of Tuesday, 25 July 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Jul 25 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
25 Jul 2017	071	012
26 Jul 2017	070	008
27 Jul 2017	070	007

Bulletin

Solar activity was at very low levels during the period. A small sunspot group seems to be developing at position N05W20. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux is somewhat enhanced above the usual nominal levels, most likely in response to the strong 23 July farside eruption from NOAA 2665. It is expected that the proton flux will remain below the proton event threshold of 10 pfu.

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 600 km/s to about 680 km/s by 22UT, then decreased to 570 km/s by the end of the period. Bz oscillated between -5 and +5 nT. The interplanetary magnetic field was mostly 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 27 stations.

Solar indices for 24 Jul 2017

Wolf number Catania	000
10cm solar flux	070
AK Chambon La Forêt	016
AK Wingst	014
Estimated Ap	014
Estimated international sunspot number	000 - Based on 28 stations

Noticeable events summary

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

All times in UTC

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