Viewing archive of Wednesday, 16 September 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Sep 16 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
16 Sep 2015	106	012
17 Sep 2015	108	015
18 Sep 2015	108	026

Bulletin

NOAA 2415, currently the most complex sunspot region on the solar disk, produced the strongest flare of the period (C3.0 flare peaking at 02:24UT). The other 4 regions were mostly quiet, with NOAA 2414 producing a single C1 flare. No earth-directed coronal mass ejections have been observed.

More C-class flares are expected, with a small chance on an M-class flare from NOAA 2415.

Solar wind speed gradually declined from values near 520 km/s to its current 470 km/s. Bz oscillated between -6 and +6 nT, with the interplanetary magnetic field pointing away from the Sun. Quiet to unsettled conditions were observed, with a single active episode at Dourbes (15:00UT). The trailing transequatorial extension of a wide northern coronal hole is transiting the central meridian.

Quiet to unsettled geomagnetic conditions are expected, with a chance on an active episode. Minor geomagnetic storming is expected on 18 and 19 September.

Today's estimated international sunspot number (ISN): 083, based on 08 stations.

Solar indices for 15 Sep 2015

Wolf number Catania	073
10cm solar flux	101
AK Chambon La Forêt	///
AK Wingst	018
Estimated Ap	024
Estimated international sunspot number	066 - Based on 23 stations

Noticeable events summary

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

All times in UTC

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