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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2020 Apr 19 1231 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

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

Сонячні протони

Quiet

	10cm flux	Ap
19 Apr 2020	069	003
20 Apr 2020	069	013
21 Apr 2020	069	010

Bulletin

The Sun was spotless. Solar activity was at very low levels and is expected to remain so.

The greater than 10 MeV proton flux and the greater than 2 MeV electron flux were at nominal values and are expected to remain so. From 21 April onwards, the electron flux could become more enhanced following the arrival of a coronal hole wind stream.

No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery.

Solar wind speed was steady between 310 and 330 km/s (DSCOVR). Bz varied between -4 and +3 nT, being mostly at positive values. The direction of the interplanetary magnetic field (phi angle) was in a mostly sunward orientation (negative sector), except for a period between midnight and 07UT when it was in a positive orientation.

Geomagnetic activity was at quiet levels. Geomagnetic conditions are expected to be quiet to unsettled, with an active interval possible on 20 April in response to the expected wind stream associated with the extension of the negative polarity southern polar coronal hole.

Today's estimated international sunspot number (ISN): 000, based on 24 stations.

Solar indices for 18 Apr 2020

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	005
AK Wingst	003
Estimated Ap	003
Estimated international sunspot number	000 - Based on 30 stations

Noticeable events summary

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

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