Viewing archive of Friday, 23 February 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Feb 23 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 23 Feb 2018 until 25 Feb 2018
Solar flares

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

10cm fluxAp
23 Feb 2018068021
24 Feb 2018068012
25 Feb 2018068012

Bulletin

There are no sunspot regions on the visible hemisphere of the Sun and flaring level is very low. The chance for a C flare in the next 24 hours is estimated at 5%.

No Earth-directed Coronal Mass Ejections (CMEs) were observed in available coronagraphic imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours.

The solar wind speed (recorded by DSCOVR and ACE) gradually increased from about 405 to 550 km/s in the past 24 hours. The Interplanetary Magnetic Field (IMF) was directed mainly toward the Sun and its magnitude ranged between about 2 and 11 nT. Bz was variable and dived below -5 nT several times, with a minimum of about -8 nT. On February 23, 24 and 25 the solar wind is expected to be at nominal levels, possibly with occasional periods of enhanced solar wind as the Earth comes close to the high speed stream associated with the negative polarity south polar coronal hole.

Quiet to active geomagnetic conditions (K Dourbes between 1 and 4; NOAA Kp between 2 and 5) were registered in the past 24 hours. Quiet to active geomagnetic levels (K Dourbes < 5) are expected for February 23, 24 and 25, with a chance for minor storm intervals (K Dourbes = 5) when the Earth comes close to the high speed stream associated with the negative polarity south polar coronal hole.

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

Solar indices for 22 Feb 2018

Wolf number Catania///
10cm solar flux068
AK Chambon La Forêt025
AK Wingst016
Estimated Ap014
Estimated international sunspot number000 - Based on 32 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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