Viewing archive of Friday, 7 August 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Aug 07 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
07 Aug 2015	125	019
08 Aug 2015	130	007
09 Aug 2015	135	007

Bulletin

The Sun produced four C-class flares during the past 24 hours, the largest one being a C4.8 peaking at 3:57 UT. All flares originated from NOAA active region 2396. A new unnumbered region has turned to the visible side, which adds the total number of active regions up to six. No Earth- directed CMEs were observed. More flares at the C-level are expected.

Earth is under influence of a flow at moderate speed, emanating from an equatorial coronal hole. Solar wind speed reached values of maximally 650 km/s, but declined to current values near 500 km/s. The magnitude of the interplanetary magnetic field (IMF) obtained values in the range of 5 to 11 nT with mainly negative Bz. At 9 UT, this resulted in geomagnetic active (K=4) conditions at the local level (Dourbes) and even minor storm conditions at the planetary level (estimated NOAA Kp=5). A few further time slots of active to minor storm conditions are possible before returning to quiet to unsettled (K=0-3) levels.

Today's estimated international sunspot number (ISN): 111, based on 27 stations.

Solar indices for 06 Aug 2015

Wolf number Catania	///
10cm solar flux	122
AK Chambon La Forêt	019
AK Wingst	016
Estimated Ap	015
Estimated international sunspot number	103 - Based on 38 stations

Noticeable events summary

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

All times in UTC

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