Viewing archive of Saturday, 20 April 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Apr 20 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
20 Apr 2019	070	005
21 Apr 2019	070	003
22 Apr 2019	070	003

Bulletin

Solar activity was at very low levels. While rounding the west limb, NOAA 2738 produced 4 B-class flares, the strongest being a B8 flare peaking at 00:50UT. The lone sunspot group currently visible on the solar disk, NOAA 2739, was quiet and is decaying. No earth-directed coronal mass ejections were observed over the last 24 hours. The greater than 10 MeV proton flux was at nominal values. An equatorial negative polarity coronal hole (CH) is transiting the central meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed was fairly steady between 300 and 350 km/s (DSCOVR). Bz varied between -4 and +6 nT. The interplanetary magnetic field was mostly directed away from the Sun (positive sector) until about 07:00UT, when it switched back to towards the Sun (negative sector). Geomagnetic conditions were at quiet levels, with an isolated unsettled interval (14-17UT) recorded at Dourbes.

Quiet geomagnetic conditions are expected to continue, with a chance on an unsettled interval.

Today's estimated international sunspot number (ISN): 012, based on 26 stations.

Solar indices for 19 Apr 2019

Wolf number Catania	///
10cm solar flux	073
AK Chambon La Forêt	009
AK Wingst	///
Estimated Ap	005
Estimated international sunspot number	024 - Based on 28 stations

Noticeable events summary

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

All times in UTC

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