Viewing archive of Wednesday, 26 June 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Jun 26 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
26 Jun 2013	104	007
27 Jun 2013	104	007
28 Jun 2013	104	007

Bulletin

Solar activity has been eruptive during the past 24 hours, featuring two low C flares from NOAA AR 11775 and 11776. More C flares are possible within the next 48 hours, with a slight chance for an M flare. The influence of the coronal hole high speed stream on the solar wind is gradually weakening. During the past 24 hours, solar wind speeds have decreased from about 520 to 440 km/s, while the IMF went further down from 4 to 2 nT. The solar wind speed is expected to continue its descent until June 28, when we will likely see the effects of another coronal hole high speed stream. Geomagnetic activity was at quiet levels (K Dourbes between 1 and 3; NOAA Kp between 1 and 2) during the past 24 hours. Quiet conditions (K Dourbes < 4) are expected for June 26 till the first half of June 28. On the second half of June 28, active periods (K Dourbes=4) are possible as a consequence of the expected arrival at Earth of a new coronal hole high spead stream.

Today's estimated international sunspot number (ISN): 041, based on 11 stations.

Solar indices for 25 Jun 2013

Wolf number Catania	///
10cm solar flux	109
AK Chambon La Forêt	009
AK Wingst	009
Estimated Ap	009
Estimated international sunspot number	052 - Based on 20 stations

Noticeable events summary

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

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