Viewing archive of Saturday, 27 January 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Jan 27 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 27 Jan 2018 until 29 Jan 2018
Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

10cm fluxAp
27 Jan 2018070009
28 Jan 2018069008
29 Jan 2018069012

Bulletin

Solar activity was at very low levels. The Sun is spotless. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Solar activity is expected to remain at very low levels.

Solar wind speed declined from initial values around 510 km/s to about 450 km/s by the end of the period. Bz oscillated between -4 and +3 nT (DSCOVR). The interplanetary magnetic field (IMF) was mostly directed towards the Sun, with some brief positive (away) periods. A small and diffuse negative equatorial coronal hole (CH) has transited the central meridian.

The geomagnetic field was at quiet to unsettled levels and is expected to remain so during the next few days. An active episode is possible from the moderate speed wind streams associated with the observed CHs.

Today's estimated international sunspot number (ISN): 000, based on 07 stations.

Solar indices for 26 Jan 2018

Wolf number Catania000
10cm solar flux070
AK Chambon La Forêt012
AK Wingst010
Estimated Ap009
Estimated international sunspot number000 - Based on 20 stations

Noticeable events summary

DayBeginMaxEndLocStrengthOP10cmCatania/NOAARadio burst types
None

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

All times in UTC

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