Vaata neljapäev, 21 september 2017 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2017 Sep 21 1239 UTC

SIDC Forecast

Valid from 1230 UTC, 21 Sep 2017 until 23 Sep 2017
Päikesepursked ehk loited

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Päikese prootonid

Quiet

10cm fluxAp
21 Sep 2017076006
22 Sep 2017076007
23 Sep 2017079016

Bulletin

Over the past 24 hours the solar activity was very low with only a few B-class flares recorded. The major flare was a B8.4-class flare at 19:32 UT attributed to the Catania sunspot group 55 (NOAA active region 2680). The returning region has been assigned a new number: Catania sunspot group 56 (NOAA active region 2681). Both regions show a simple photospheric magnetic field configuration (alpha) and are unlikely to produce any strong flaring activity. We expect the solar activity to remain low with some B-class flares and a slight chance for C-class flares.

No Earth directed CMEs have been observed and the solar protons remained at background level over the past 24 hours.

The Earth is currently inside a slow solar wind flow that has declined further from 500 to 400 Km/s. The interplanetary magnetic field magnitude remained below 6 nT and the Bz component fluctuated between -4 and 4 nT being mainly negative. A relatively small equatorial coronal hole in the south hemisphere has crossed the central meridian yesterday Sept 20 around 16:30 UT. The associated fast solar wind is expected to arrive at Earth on Sept 23 late afternoon.

Geomagnetic conditions were quiet to unsettled with Kp (NOAA) and local K (Dourbes) indexes ranging between 1-3 and 0-2 respectively. The geomagnetic conditions are expected to remain quiet to unsettled until Sept 23 when the fast solar will reach Earth.

Today's estimated international sunspot number (ISN): 023, based on 22 stations.

Solar indices for 20 Sep 2017

Wolf number Catania012
10cm solar flux074
AK Chambon La Forêt012
AK Wingst012
Estimated Ap012
Estimated international sunspot number021 - Based on 28 stations

Noticeable events summary

DayBeginMaxLõppLocStrengthOP10cmCatania/NOAARadio burst types
Puuduvad

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

Kõik ajad UTC-s

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