Het archief bekijken van zaterdag 25 augustus 2018

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2018 Aug 25 1230 UTC

SIDC Prognose

Zonnevlammen

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

Geomagnetisme

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

Proton Flux monitor

Quiet

	10cm flux	Ap
25 Aug 2018	072	021
26 Aug 2018	072	021
27 Aug 2018	071	008

Bulletin

NOAA active region 2720 has been growing steadily and was the source of a series of B flares over the period. The strongest was a B4.1 flare peaking at 10:48UT. The other region on disk (NOAA 2719) seemed to be in decay at the end of the period. Overall probability for the occurrence of a C-flare remains low (around 20%).

No Earth directed CMEs have been identified in coronagraph data.

Proton flux levels were at background values and are expected to remain so.

Solar wind speed continued to decrease (to as low as 320 km/s) until around midnight when a steady increase to current values of 400 km/s set in. Throughout the period, the magnetic field was only slightly elevated (mostly 5-8 nT), but with the magnetic field rotation indicating that this is indeed the passing of a magnetic cloud as expected from the august 20 CME. More recently, magnetic field strength reached up to 10 nT. Apart from at the start of the period, Bz has been mostly positive throughout the period. Solar wind conditions are expected to remain elevated over the next 24 hours but with a decreasing trend.

Geomagnetic conditions were mostly quiet (local K Dourbes and NOAA Kp 0-2) apart from an isolated period of unsettled (K=3) conditions both locally and in terms of Kp at the start of the period, related to the negative Bz at that time. Geomagnetic conditions may still see active periods over the next 24 hours should the enhanced magnetic field show persistent periods of Southward orientation. Later, geomagnetic conditions should remain quiet to unsettled.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 034, gebaseerd op 18 stations.

Zon indexen voor 24 Aug 2018

Wolfgetal Catania	///
10cm zonneflux	072
AK Chambon La Forêt	008
AK Wingst	006
Geschatte Ap	005
Geschat internationaal zonnevlekkengetal	029 - Gebaseerd op 28 stations

Overzicht opvallende gebeurtenissen

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

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