Viewing archive of Tuesday, 22 May 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 May 22 1304 UTC

SIDC Forecast

Valid from 1230 UTC, 22 May 2018 until 24 May 2018
Solar flares

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

Geomagnetism

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

Solar protons

Quiet

10cm fluxAp
22 May 2018070005
23 May 2018071014
24 May 2018072008

Bulletin

Solar activity was at low levels. Catania sunspot group 82 (NOAA AR 2710) produced one B2.8 flare peaking at 05:07 UT today. 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 be at low levels with some probability for C-class flares. The solar wind speed remained below 400 km/s over the past 24 hrs. Interplanetary magnetic field magnitude remained below 5 nT till 11:00 UT today (recorded by ACE). Later interplanetray magnetic filed magnitude gradually increased till 9 nT, simutaniously Bz component decreased from -2 nT till -5 nT. Solar wind parameters variations may increase from now due to the expected influence of the recurrent positive polarity northern polar coronal hole. Solar wind speeds may increase till about 500 km/s later today or tomorrow (accodring to STEREO data). Geomagnetic conditions have been quiet over the past 24 hrs. Unsettled geomagnetic conditions can be expected today and tomorrow. Isolated episodes of active conditions are also not excluded.

Today's estimated international sunspot number (ISN): 013, based on 23 stations.

Solar indices for 21 May 2018

Wolf number Catania013
10cm solar flux070
AK Chambon La Forêt007
AK Wingst003
Estimated Ap003
Estimated international sunspot number011 - Based on 28 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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