Vaata neljapäev, 23 aprill 2015 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2015 Apr 23 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 23 Apr 2015 until 25 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
23 Apr 2015152023
24 Apr 2015152016
25 Apr 2015152007

Bulletin

Solar flaring activity was mainly low but reached moderate levels with an M1.1 flare originating from Catania group 28 (NOAA 2322) from beyond the West limb peaking at 10:07 UT. Some further low level C flaring was observed from Catania groups 31 and 32 (NOAA 2326 and 2324 respectively). Most regions on disc appear mostly stable or in decay and not too remarkable. We expect C flaring over the next days. No Earth directed CME's were observed in the available coronagraph images. Solar wind conditions showed the decline of the positive polarity coronal hole high speed stream. Solar wind speed decreased from around 560 km/s at the start of the reporting period to around 440 km/s presently. Total magnetic field was around 4-5 nT with a short excursion up to 7 nT. Bz was variable remaining above -5nT. The magnetic field phi angle was stable in the outward sector. The were no clearly identifiable signs of the arrival of the April 18 CME. There remains a possibility for the CME to arrive later today or otherwise its effects have been covered up by the high speed stream effects. Geomagnetic conditions were quiet to unsettled with an isolated active period at planetary level (NOAA Kp 2-4, local K Dourbes 0-3). Solar wind is expected to further stabilize to nominal condition over the next days, but there remains a possibility for agitated conditions if the April 18 CME still arrives. Correspondingly, quiet to unsettled geomagnetic conditions are expected, with possibly active to minor storm conditions in case of CME arrival.

Today's estimated international sunspot number (ISN): 087, based on 22 stations.

Solar indices for 22 Apr 2015

Wolf number Catania181
10cm solar flux150
AK Chambon La Forêt018
AK Wingst011
Estimated Ap012
Estimated international sunspot number105 - Based on 29 stations

Noticeable events summary

DayBeginMaxLõppLocStrengthOP10cmCatania/NOAARadio burst types
23091810071110----M1.1--/2322

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

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