Vaata teisipäev, 21 aprill 2015 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2015 Apr 21 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 21 Apr 2015 until 23 Apr 2015
Päikesepursked ehk loited

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

Geomagnetism

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

Päikese prootonid

Quiet

10cm fluxAp
21 Apr 2015152015
22 Apr 2015154041
23 Apr 2015156022

Bulletin

Solar flaring activity was moderate with 3 M class flares. The largest, an M2.3 flare occurred just before the end of the reporting period, peaking at 11:57 UT and originated from Catania group 28 (NOAA region 2322) near the Western limb. Another M1 flare peaking at 7:21 UT originated from that same region. The region on the Eastern limb which is about to rotate into view caused a long duration M2.2 flare peaking at 10:40UT. Only a number of very low class C flares were observed in addition. There are currently 8 numbered NOAA regions on disc and 9 Catania sunspot groups, with a new group emerging near S14W07. All are fairly unremarkable. We expect C flaring over the next days with a chance for M flaring especially from the new region that is turning onto the disc from the East. Proton fluxes were at background levels. No earth directed CME's have been observed. Solar wind was marked by the arrival of the high speed stream from a positive polarity coronal hole. Just after the start of the reporting period the magnetic field phi angle turned towards the outward direction. The total magnetic field saw a rise from 5-6 nT to about 15 nT in the compression region, while speeds were slowly rising from around 400 km/s to around 500 km/s. Magnetic field then restored to current levels around 7nT with the arrival of the core of the high speed stream around 2:00 UT, reaching a stable speed of close to 600km/s. Bz was variable in the -8nT to +12 nT range Geomagnetic conditions were locally quiet to unsettled (K Dourbes 2-3) with some active periods on the planetary level (NOAA Kp 4 in the 0UT-6UT timeframe). The high speed stream is expected to persist for the day. As its influence declines over the next day the arrival of the April 18 CME will enhance solar wind conditions again/further. Associated with the high speed stream influence some periods of active geomagnetic conditions are possible with afterwards active to minor storm conditions likely with the arrival of the April 18 CME.

Today's estimated international sunspot number (ISN): 096, based on 21 stations.

Solar indices for 20 Apr 2015

Wolf number Catania///
10cm solar flux150
AK Chambon La Forêt021
AK Wingst011
Estimated Ap011
Estimated international sunspot number098 - Based on 27 stations

Noticeable events summary

DayBeginMaxLõppLocStrengthOP10cmCatania/NOAARadio burst types
21070807210727N09W80M1.0SF28/2322III/1

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

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