Viewing archive of Thursday, 18 April 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Apr 18 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
18 Apr 2019	076	001
19 Apr 2019	075	008
20 Apr 2019	073	006

Bulletin

Solar activity was at very low levels. The two currently visible sunspot groups are quiet. A small-sized coronal dimming (location: S45E10 at 21UT) was observed following a magnetic reconnection event during the afternoon of 17 April. No earth-directed coronal mass ejections were observed over the last 24 hours. The greater than 10 MeV proton flux was at nominal values.

Solar activity is expected to remain at very low levels.

Solar wind speed gradually decreased from 340 km/s to its current values near 300 km/s (DSCOVR). Bz varied between -4 and +4 nT, with a positive stretch from 20UT till 05UT. The interplanetary magnetic field was directed towards the Sun (negative sector). Quiet geomagnetic conditions were observed.

Quiet geomagnetic conditions are expected to continue, with a chance on an unsettled interval on 19-20 April due to anticipated effects from a sector boundary crossing and from a weak wind stream related to a diffuse extension of the positive polarity polar coronal hole.

Today's estimated international sunspot number (ISN): 027, based on 22 stations.

Solar indices for 17 Apr 2019

Wolf number Catania	012
10cm solar flux	076
AK Chambon La Forêt	008
AK Wingst	///
Estimated Ap	006
Estimated international sunspot number	015 - Based on 27 stations

Noticeable events summary

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

All times in UTC

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