Vaata neljapäev, 17 september 2015 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2015 Sep 17 1231 UTC

SIDC Forecast

Valid from 1230 UTC, 17 Sep 2015 until 19 Sep 2015
Päikesepursked ehk loited

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

Geomagnetism

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

Päikese prootonid

Quiet

10cm fluxAp
17 Sep 2015114018
18 Sep 2015116029
19 Sep 2015118018

Bulletin

NOAA 2415 developed a small delta structure just south of its middle main spot. This resulted in 12 C-class flares and 1 M-class flare. Notable events were a C9.5 flare peaking at 03:03UT, and the M1.1 flare peaking at 09:40UT. The other 3 regions were quiet. No earth-directed coronal mass ejections have been observed.

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

Solar wind speed fluctuated mostly between 440 and 490 km/s, and is currently near 460 km/s. Bz oscillated between -6 and +5 nT, with the interplanetary magnetic field pointing away from the Sun. Quiet to unsettled conditions were observed, with active episodes around midnight.

Quiet to active geomagnetic conditions are expected. Minor geomagnetic storming is possible on 18 and/or 19 September in response to the arrival of the high speed stream of a transequatorial coronal hole.

Today's estimated international sunspot number (ISN): 065, based on 10 stations.

Solar indices for 16 Sep 2015

Wolf number Catania093
10cm solar flux109
AK Chambon La Forêt///
AK Wingst016
Estimated Ap014
Estimated international sunspot number078 - Based on 19 stations

Noticeable events summary

DayBeginMaxLõppLocStrengthOP10cmCatania/NOAARadio burst types
17093409400945S21W04M1.1SF31/2415

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

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