Het archief bekijken van woensdag 22 februari 2017

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2017 Feb 22 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
22 Feb 2017	085	011
23 Feb 2017	085	031
24 Feb 2017	085	031

Bulletin

Solar activity was low with NOAA region 2638 (Catania groups 95 and 96), the only active region on disk, producing several B flares of which the strongest of magnitude B6.8 peaking at 1:51UT. The region appears to be fairly simple and flaring is expected to remain at B level. No Earth directed CMEs have been observed in coronagraph data. The proton flux values are at background levels and expected to remain so.

Solar wind speed fluctuated in the 400-450 km/s range. Total magnetic field gradually increased from 4nT to around 7nT. There was a period of persistent positive Bz and fluctuation in the magnetic field phi angle following a drop in temperature around 15:30 UT. But otherwise Bz was variable with negative peaks not lower than -5nT and the magnetic field phi angle stable in the positive sector. Solar wind speed is expected to pick up by tomorrow February 23 reaching around 600 km/s under the influence of the equatorial positive polarity coronal hole. Geomagnetic conditions have been quiet to unsettled (local K Dourbes 1-3) with an isolated active period around midnight (only NOAA Kp 4). Over the next days active conditions are likely with also minor geomagnetic storms possible due to the expected high speed stream.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 028, gebaseerd op 09 stations.

Zon indexen voor 21 Feb 2017

Wolfgetal Catania	050
10cm zonneflux	083
AK Chambon La Forêt	015
AK Wingst	005
Geschatte Ap	004
Geschat internationaal zonnevlekkengetal	027 - Gebaseerd op 19 stations

Overzicht opvallende gebeurtenissen

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

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