Vaata reede, 21 august 2015 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2015 Aug 21 1230 UTC

SIDC Forecast

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

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

Geomagnetism

Quiet (A<20 and K<4)

Päikese prootonid

Quiet

10cm fluxAp
21 Aug 2015105009
22 Aug 2015106008
23 Aug 2015107010

Bulletin

Solar activity has increased over the past 24 hours, with Active Region (AR) 2403 (Macintosh:Dkc/Type:Beta-Gamma) showing significant flux emergence, and producing two M-class flares; a M1.2 flare peaking at 02:18 UT and a M1.4 flare peaking at 09:50 UT. The Sun also produced two Coronal Mass Ejections (CMEs); a slow CME first observed from beyond the south west limb at 02:48 UT on 20-Aug-2015, and a more energetic event from beyond the the north east limb at 10:12 UT on 20-Aug-2015. Both are believed to be back-sided and will not interact with the Earth. No evident Earth directed CMEs were produced in the past 24 hours. Solar activity is expected to remain active over the next 24 hours, with AR 2403 producing C-class flares with the possibility of M and X-class flares. The solar wind speed has been slowly decreasing over the past 24 hours, from 500 km/s to 450 km/s. The total interplanetary magnetic field (IMF) strength has been decreasing from 9 nT to 5 nT, and the Bz component has been fluctuating between -6 nT and +6 nT over the past 24 hours. Geomagnetic conditions varied between quiet and active over the past 24 hours, with the local K index (Dourbes) reaching 3 and the Kp index (NOAA) reaching 4 yesterday (2015-Aug-20), these conditions were possibly caused by a coronal hole (CH) located in the north-west region of the sun. The solar wind speed and IMF strength, as recorded by ACE, have both been decreasing and the geomagnetic field is expected to exhibit quiet levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 079, based on 19 stations.

Solar indices for 20 Aug 2015

Wolf number Catania///
10cm solar flux103
AK Chambon La Forêt019
AK Wingst016
Estimated Ap017
Estimated international sunspot number064 - Based on 28 stations

Noticeable events summary

DayBeginMaxLõppLocStrengthOP10cmCatania/NOAARadio burst types
21015602180237S16E39M1.21F--/2403

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

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