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Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2018 Apr 20 1230 UTC

SIDC Prognose

Zonnevlammen

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

Geomagnetisme

Minor storm expected (A>=30 or K=5)

Proton Flux monitor

Quiet

	10cm flux	Ap
20 Apr 2018	073	035
21 Apr 2018	072	013
22 Apr 2018	072	009

Bulletin

The sunspot group which appeared from the behind of the East solar limb yesterday got numbered as Catania sunspot group 78 (NOAA AR 2706). This sunspot group was source of the all (low B-class), flaring activity during last 24 hours. We expect that Catania sunspot group 78 might be the source of the B-class flares and possibly also isolated C-class flare in the following 24 hours. There were no Earth directed CMEs observed since the last report and the solar protons remain at the background level.

The in situ observations showed sudden increase of the interplanetary magnetic field magnitude (IMF), solar wind speed, density and temperature at about 23:19 UT yesterday evening. All this indicates arrival of the shock wave, however presently it is still unclear if the shock wave will be followed by the ICME or this is a shock in the solar wind related with the expected arrival of the fast flow. The shock wave was followed by gradual increase of the solar wind speed and IMF. The fast solar wind (up to 515 km/s) and longer intervals of negative values of the Bz component of the IMF (down to -19 nT), resulted in the active to storm geomagnetic conditions reported this morning (local station at Dourbes reported K=5 and NOAA reported Kp=6). The solar wind speed is presently about 480 km/s and the IMF is about 14 nT. If the solar wind speed will continue to increase and the Bz component will show longer intervals with negative values we can expect continuation of the disturbed geomagnetic conditions in the coming hours.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 015, gebaseerd op 27 stations.

Zon indexen voor 19 Apr 2018

Wolfgetal Catania	012
10cm zonneflux	071
AK Chambon La Forêt	011
AK Wingst	002
Geschatte Ap	002
Geschat internationaal zonnevlekkengetal	007 - Gebaseerd op 39 stations

Overzicht opvallende gebeurtenissen

Aangeboden door het Solar Influences Data Analysis Center© - SIDC - Verwerkt door SpaceWeatherLive

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