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Daily bulletin on solar and geomagnetic activity from the SIDC

Datum verslag: 2014 Apr 21 1237 UTC

SIDC Forecast

Zonnevlammen

Eruptive (C-class flares expected, probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Proton Flux monitor

Quiet

	10cm flux	Ap
21 Apr 2014	158	015
22 Apr 2014	153	005
23 Apr 2014	148	005

Bulletin

There are currently 9 sunspot regions on the visible disk. Most are stable, with only NOAA 2034, 2035 and 2036 having a more complex beta- gamma structure. These three groups produced 7 of the 9 low-level C-class flares that were observed during the last 24 hours. Dynamic but small active regions NOAA 2038 and 2045 produced the two other C flares. Several CMEs were observed near and behind the northwest limb, related to continuing activity near NOAA 2032/2033. None of these CMEs had an earth- directed component. Further C-class flaring is expected, with a small chance on an isolated M-flare. Active to minor storm conditions were observed in response to the ICME related to the M7 flare. Solar wind speed gradually declined from 700 to 600km/s, with Bz varying mostly between +11 and -7nT. Geomagnetic conditions are expected to be quiet with an occasional active period as the geomagnetic field recovers from the ICME impact.

Today's estimated international sunspot number (ISN): 115, based on 13 stations.

Solar indices for 20 Apr 2014

Wolf number Catania	///
10cm solar flux	163
AK Chambon La Forêt	030
AK Wingst	023
Estimated Ap	022
Estimated international sunspot number	137 - Based on 19 stations

Noticeable events summary

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

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