Просмотр архива за пятница, 28 февраля 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2020 Feb 28 1231 UTC

SIDC Forecast

Солнечные вспышки

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Солнечные протоны

Quiet

	10cm flux	Ap
28 Feb 2020	072	010
29 Feb 2020	072	006
01 Mar 2020	071	010

Bulletin

Solar activity was at very low levels. The Sun is still spotless. A small active region close to the east limb at latitude S10 seems spotless, whereas another small region at latitude N25 is still at the east limb as seen in SDO/AIA imagery. No earth-directed coronal mass ejections (CMEs) have been observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal values. A small and irregularly shaped equatorial negative polarity coronal hole (CH) is present on the solar disk.

Solar activity is expected to remain at very low levels.

Solar wind conditions were at background levels. Solar wind speed declined from about 380 km/s at the beginning of the period to 330 km/s by 06:30UT, then increasing again to its current value around 350 km/s(ACE). Bz undulated between -4 and +4 nT. The direction of the interplanetary magnetic field (phi angle) was mainly towards the Sun until around 06:30UT, when it switched towards predominantly a positive sector (away from the Sun). Geomagnetic conditions were at quiet levels, with an unsettled episode (09-12UT) recorded at Dourbes.

Geomagnetic activity is expected to be mostly at quiet levels, with an isolated unsettled interval remaining possible. Late on 29 February or during 01 March, geomagnetic conditions may become unsettled with a chance on an active episode following the expected arrival of a wind stream associated with the negative polarity CH.

Today's estimated international sunspot number (ISN): 000, based on 20 stations.

Solar indices for 27 Feb 2020

Wolf number Catania	000
10cm solar flux	071
AK Chambon La Forêt	008
AK Wingst	003
Estimated Ap	002
Estimated international sunspot number	000 - Based on 23 stations

Noticeable events summary

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

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