Viewing archive of Thursday, 27 July 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Jul 27 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
27 Jul 2017	069	006
28 Jul 2017	069	003
29 Jul 2017	070	003

Bulletin

Solar activity was at very low levels, and is expected to remain so. The solar disk was spotless. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux remained slightly above background levels.

Earth is exiting the high speed stream (HSS) from a positive polarity coronal hole (CH). Wind speed gradually decreased from 590 km/s to its current values near 450 km/s (DSCOVR). Bz oscillated between -4 and +3 nT until about 19UT, when it started a much smoother variation between -3 and +2 nT. The interplanetary magnetic field was mostly directed away from the Sun.

The geomagnetic field was at quiet levels. Mostly quiet geomagnetic conditions are expected, with a chance on an unsettled episode.

Today's estimated international sunspot number (ISN): 000, based on 16 stations.

Solar indices for 26 Jul 2017

Wolf number Catania	013
10cm solar flux	069
AK Chambon La Forêt	012
AK Wingst	013
Estimated Ap	013
Estimated international sunspot number	000 - Based on 24 stations

Noticeable events summary

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

All times in UTC

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