Viewing archive of Friday, 12 June 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Jun 12 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
12 Jun 2015	145	014
13 Jun 2015	150	007
14 Jun 2015	155	008

Bulletin

About a dozen C-class flares occurred during the past 24 hours, originating from Catania sunspot regions 79, 80 and 87 (NOAA active regions 2360, 2361 and 2367). The largest flare was a C8.3 flare peaking at 14:37 UT on June 11, coming from Catania region 87. Catania region 83 has developed to a beta-gamma region. More C-class flares are expected and quite likely also an isolated M-class flare. Two rather narrow CMEs (first measurements at 11:00 UT and 14:48 UT on June 11 in LASCO/C2) of less than 100 degrees angular width are propagating to the East without any expected geoeffectiveness.

High speed stream effects on Earth are reducing. Solar wind speed has decreased from 600 to 450 km/s, while the magnetic field magnetic was maximally at 5 nT. Geomagnetic conditions are quiet to unsettled (K= 1 to 3), with a single time slot of active levels (K=4) at Dourbes. Geomagnetic conditions might enhance in case of arrival of the June 9 CME, potentially expected today. The arrival of a new high speed stream is expected on June 14 or 15, emanating from a negative polarity equatorial coronal hole.

Today's estimated international sunspot number (ISN): 079, based on 21 stations.

Solar indices for 11 Jun 2015

Wolf number Catania	///
10cm solar flux	140
AK Chambon La Forêt	013
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	073 - Based on 24 stations

Noticeable events summary

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

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