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

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

All times in UTC

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