Välja antud: 2017 Sep 21 1239 UTC
Quiet conditions (<50% probability of C-class flares)
Quiet (A<20 and K<4)
Quiet
10cm flux | Ap | |
---|---|---|
21 Sep 2017 | 076 | 006 |
22 Sep 2017 | 076 | 007 |
23 Sep 2017 | 079 | 016 |
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.
Wolf number Catania | 012 |
10cm solar flux | 074 |
AK Chambon La Forêt | 012 |
AK Wingst | 012 |
Estimated Ap | 012 |
Estimated international sunspot number | 021 - Based on 28 stations |
Day | Begin | Max | Lõpp | Loc | Strength | OP | 10cm | Catania/NOAA | Radio burst types | |
---|---|---|---|---|---|---|---|---|---|---|
Puuduvad |
Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive
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