Viewing archive of Friday, 26 February 2016
Daily bulletin on solar and geomagnetic activity from the SIDC
Issued: 2016 Feb 26 1230 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 | |
|---|---|---|
| 26 Feb 2016 | 090 | 013 |
| 27 Feb 2016 | 090 | 017 |
| 28 Feb 2016 | 090 | 015 |
Bulletin
Solar activity was low. Catania group 27 (NOAA 2506) produced the two largest flares of the period. A C1 flare peaking at 9:51UT and a B8 flare peaking at 19:56UT. 3 new regions were numbered by Catania. Two of them emerged on disk: group 28 (NOAA 2507) around N18W49 and group 29 (NOAA unnumbered) around S26E15. A third group (30) rotated on disk in the NorthEast. Neither of the new regions appears particularly complex. Solar flaring is expected to remain below C level although an occasional C flare remains possible. No Earth directed CMEs were recorded.
Solar wind conditions showed the passage of a sector boundary crossing into the positive sector before midnight with an associated period of increase of total magnetic field to around 13 nT. Bz was variable reaching down to -8nT. The sector boundary crossing also marked the start of a phase of continuous rise of the solar wind speed from near 300 km/s to 420 km/s. Solar wind speed is expected to rise somewhat further under the influence of the extensions of the northern polar coronal hole. Quiet to unsettled geomagnetic conditions were recorded (NOAA Kp 3 after midnight). As solar wind speed may become further elevated, further periods of unsettled geomagnetic conditions are possible.
Today's estimated international sunspot number (ISN): 053, based on 08 stations.Solar indices for 25 Feb 2016
| Wolf number Catania | /// |
| 10cm solar flux | 092 |
| AK Chambon La Forêt | 019 |
| AK Wingst | 006 |
| Estimated Ap | 006 |
| Estimated international sunspot number | 027 - Based on 21 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
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