Viewing archive of Thursday, 11 June 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Jun 11 1230 UTC

SIDC Forecast

Solar flares

M-class flares expected (probability >=50%)

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
11 Jun 2015	150	011
12 Jun 2015	160	020
13 Jun 2015	165	007

Bulletin

Solar activity has increased since the last bulletin. More than a dozen C-class flares and one M1.0 flare were observed by the GOES spacecraft. Almost every currently visible sunspot group contributed to this activity. The M1.0 flare, peaking at 8:55 UT on June 11 originated from a region that is currently turning to the Earth-facing side of the Sun. More flaring activity is to be expected, certainly at the C-level. Also an additional M-class flare is possible, mainly from the new region at the East limb (no NOAA number yet). The latest coronagraphic images indicate the occurrence of a CME propagating east of the Sun-Earth line, but more complete data are needed to analyse this.

The effects of the high speed stream are gradually decreasing. The solar wind speed is currently around 570 km/s and the interplanetary magnetic field magnitude obtains values below 5 nT. Geomagnetic conditions remain quiet to unsettled (K= 1 to 3), which is expected to continue for the next few hours. Geomagnetic activity might reach active to at most minor storm levels on June 12, depending on the potential arrival of the June 9 CME and the magnetic field properties.

Today's estimated international sunspot number (ISN): 074, based on 14 stations.

Solar indices for 10 Jun 2015

Wolf number Catania	136
10cm solar flux	///
AK Chambon La Forêt	017
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	074 - Based on 27 stations

Noticeable events summary

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

All times in UTC

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