Viewing archive of Tuesday, 16 April 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Apr 16 1231 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
16 Apr 2019	075	007
17 Apr 2019	074	006
18 Apr 2019	074	005

Bulletin

Solar activity was at very low levels. NOAA 2738 produced a B3 flare peaking at 19:31UT. No earth-directed coronal mass ejections were observed over the last 24 hours. The greater than 10 MeV proton flux was at nominal values. A weak extension from the positive polarity northern polar coronal hole (CH) is transiting the central meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed continued its gradual increase from its initial 340 km/s to reach 400 km/s by the end of the period. Bz varied between -6 and 6 nT, with a negative stretch from 15 till 20UT. The interplanetary magnetic field was mostly directed towards the Sun (negative sector). Quiet to unsettled geomagnetic conditions were observed.

Quiet to unsettled geomagnetic conditions are expected to continue.

Today's estimated international sunspot number (ISN): 012, based on 23 stations.

Solar indices for 15 Apr 2019

Wolf number Catania	///
10cm solar flux	075
AK Chambon La Forêt	014
AK Wingst	///
Estimated Ap	009
Estimated international sunspot number	013 - Based on 33 stations

Noticeable events summary

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

All times in UTC

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