Перегляд архіву середа, 28 лютого 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2018 Feb 28 1232 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10cm flux	Ap
28 Feb 2018	069	009
01 Mar 2018	069	006
02 Mar 2018	068	009

Bulletin

Solar activity remains to be low, without even B-class flares reported during last 24 hours. Occasional B-class flares are possible in the coming hours, and isolated C-class flares are possible but not very probable. The low level flaring from the Catania sunspot group 73 (NOAA AR 2700) observed this morning was associated with coronal dimming and EIT wave, i.e. on disc signature of the coronal mass ejection (CME). More will be reported when coronagraph data become available, however it is very probable that the CME was rather narrow and slow and it will therefore not arrive to the Earth. During last 24 hours solar protons remained at background level.

Solar wind speed is presently about 430 km/s and the interplanetary magnetic field magnitude is about 5 nT. The solar wind flow, associated with the equatorial coronal hole that reached central meridian in February 22, reached its maximum value of about 560 km/s on February 27 at about 15:30 UT. The fast solar wind associated with rather small and patchy equatorial coronal hole which reached central meridian in the morning of February 26 might be expected to arrive to the Earth in the morning of March 02. Due to fast solar wind and longer intervals of negative value of the Bz component of the interplanetary magnetic field disturbed geomagnetic conditions were reported around midday yesterday (NOAA reported Kp=4 and local station at Dourbes reported K=4). Presently geomagnetic conditions are quiet to unsettled and we expect them to stay so in the coming hours.

Today's estimated international sunspot number (ISN): 012, based on 21 stations.

Solar indices for 27 Feb 2018

Wolf number Catania	///
10cm solar flux	068
AK Chambon La Forêt	016
AK Wingst	021
Estimated Ap	021
Estimated international sunspot number	017 - Based on 31 stations

Noticeable events summary

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

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