Viewing archive of Friday, 20 September 2019
Daily bulletin on solar and geomagnetic activity from the SIDC
Issued: 2019 Sep 20 1245 UTC
SIDC Forecast
Solar flares
Quiet conditions (<50% probability of C-class flares)
Geomagnetism
Quiet (A<20 and K<4)
Solar protons
Quiet
| 10cm flux | Ap | |
|---|---|---|
| 20 Sep 2019 | 067 | 006 |
| 21 Sep 2019 | 067 | 007 |
| 22 Sep 2019 | 067 | 007 |
Bulletin
Solar X ray flux remained below B level throughout the period. The Solar disk is spotless and X-ray flux is expected to remain at or below background levels.
A filament in the Southern hemisphere stretching from the central meridian towards the Eastern limb is seen to erupt in SDO/AIA 304 imagery from around 21:00UT. Corresponding STEREO/COR2 coronagraph data indicate a corresponding narrow CME may be Earth directed. SoHO/LASCO data do not show any clear signs of any (partial) halo CME but they are being analysed further in order to assess the possibility of an Earth directed component. There were otherwise no Earth-directed CMEs observed in coronagraph data.
An equatorial negative polarity coronal hole is about to cross the central meridian.
Proton levels were at background values and are expected to remain so.
Solar wind was nominal. Solar wind speed decreased from 380 km/s to 320 km/s. Total magnetic field was around 4nT. The magnetic field phi angle was mostly in the positive sector. Solar wind conditions are expected to remain nominal over the next 48 hours. Afterwards the influence of the negative polarity equatorial coronal hole is expected to increase solar wind conditions.
Geomagnetic conditions were quiet to unsettled (NOAA Kp 1-2 and local K Dourbes 0-3). Quiet geomagnetic conditions are expected the next 48 hours.
Today's estimated international sunspot number (ISN): 000, based on 21 stations.Solar indices for 19 Sep 2019
| Wolf number Catania | 000 |
| 10cm solar flux | 067 |
| AK Chambon La Forêt | 008 |
| AK Wingst | 004 |
| Estimated Ap | 005 |
| Estimated international sunspot number | 000 - Based on 29 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
Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future
Whitehorse, YTAnchorage, AK, Fairbanks, AK
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