Viewing archive of Sunday, 26 July 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Jul 26 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
26 Jul 2015	098	008
27 Jul 2015	103	008
28 Jul 2015	109	012

Bulletin

There are currently 2 sunspot groups visible on the solar disk. NOAA 2389 is small and produced only B-class flares. NOAA 2390 shows some mixed magnetic polarity mixing in its asymmetric trailing portion. No C-class flares were recorded. Two significant coronal mass ejections (CMEs) were observed on 25 July starting resp. at 14:48UT (northwest) and 19:24UT (northeast), but they were both backside events. No earth-directed CMEs were observed.

There's a reasonable chance on C-class flares.

Solar wind speed varied mostly between 390 and 450 km/s, while Bz fluctuated between -6 and +6 nT under the influence from a moderate-speed stream from the northern coronal hole (CH) starting around 18:00UT on 25 July. Mostly quiet to unsettled geomagnetic conditions were observed. The wind stream from a small equatorial positive coronal hole (CH) may influence the earth environment on 28-29 July.

Mostly quiet to unsettled geomagnetic conditions are expected, with a small chance on an active episode.

Today's estimated international sunspot number (ISN): 043, based on 15 stations.

Solar indices for 25 Jul 2015

Wolf number Catania	///
10cm solar flux	094
AK Chambon La Forêt	015
AK Wingst	011
Estimated Ap	010
Estimated international sunspot number	036 - Based on 20 stations

Noticeable events summary

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

All times in UTC

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