Viewing archive of Friday, 7 September 2018
Daily bulletin on solar and geomagnetic activity from the SIDC
Issued: 2018 Sep 07 1230 UTC
SIDC Forecast
Solar flares
Quiet conditions (<50% probability of C-class flares)
Geomagnetism
Active conditions expected (A>=20 or K=4)
Solar protons
Quiet
| 10cm flux | Ap | |
|---|---|---|
| 07 Sep 2018 | 067 | 011 |
| 08 Sep 2018 | 067 | 010 |
| 09 Sep 2018 | 067 | 006 |
Bulletin
Solar activity was at very low levels. The Sun remained spotless. No earth-directed coronal mass ejections (CMEs) were observed in the available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. A trans-equatorial extension of the positive polarity coronal hole (CH) at the Sun's north pole has started its transit of the Central Meridian early on 7 September.
Solar activity is expected to remain at very low levels.
Solar wind was steady at nominal values, until the arrival of the co- rotating interaction region (CIR) and wind stream from the negative polarity CH. The CIR arrived around 19:30UT, with solar wind density increasing from about 5 to 24 particles/cm3 by midnight, and the interplanetary magnetic field changing direction from mostly away to mostly towards the Sun. Solar wind speed started to increase from 02:30UT onwards, reaching a maximum near 510 km/s by 08UT, and is steady since then (DSCOVR). Bz varied between -4 and +4 nT, being mostly positive, and with a strong positive episode near +10 nT from 04UT till 07UT, with little interruption.
Due to the predominately positive Bz, mostly quiet geomagnetic conditions were observed. Quiet to unsettled geomagnetic conditions are expected, with a decreasing chance on an active episode as the CH wind stream is passing by.
Today's estimated international sunspot number (ISN): 000, based on 24 stations.Solar indices for 06 Sep 2018
| Wolf number Catania | 000 |
| 10cm solar flux | 067 |
| AK Chambon La Forêt | 010 |
| AK Wingst | 005 |
| Estimated Ap | 004 |
| Estimated international sunspot number | 000 - Based on 26 stations |
Noticeable events summary
| Day | Begin | Max | End | Loc | Strength | OP | 10cm | Catania/NOAA | Radio burst types | |
|---|---|---|---|---|---|---|---|---|---|---|
| None | ||||||||||
Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive
All times in UTC
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