Vaata teisipäev, 28 aprill 2020 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2020 Apr 28 1231 UTC

SIDC Forecast

Päikesepursked ehk loited

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

Geomagnetism

Quiet (A<20 and K<4)

Päikese prootonid

Quiet

	10cm flux	Ap
28 Apr 2020	069	007
29 Apr 2020	070	008
30 Apr 2020	070	008

Bulletin

Solar X-ray flux remained below B level. Active Region (AR) 2760 (Mcintosh class: Axx; Mag. type: alpha) has decayed and been quiet over the last 24 hours. Another small bipolar region, located around S17W10 has also not shown any flaring activity. Solar flaring activity is expected to remain at very low levels.

A slow filament eruption in the northern hemisphere of the solar disk was observed around 12 UT on Apr 27. Preliminary analysis from STEREO-A COR2 data show an eruption with an initial speed of around 260 km/s and suggests there could be an Earth directed component. This may impact Earth around midday on May 02.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to stay at nominal levels for the next 24 hours. The greater than 2 MeV electron flux was between nominal and moderate levels over the past 24 hours and is expected to be at nominal levels over the next 24 hours.

The solar wind speed near Earth oscillated around 400 km/s and the total magnetic field fluctuated around 5 nT (DSCOVR) over the past 24 hours. The Interplanetary Magnetic Field (IMF) was predominantly oriented towards the Sun (phi angle in the negative sector). Bz ranged between -6 and +5 nT. Nominal solar wind conditions are expected for Apr 28-30.

Geomagnetic conditions were quiet to unsettled (local K Dourbes and NOAA Kp recorded values between 1-3). Quiet geomagnetic conditions are expected for Apr 28-30 with isolated unsettled episodes possible.

Today's estimated international sunspot number (ISN): 023, based on 08 stations.

Solar indices for 27 Apr 2020

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	014
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	029 - Based on 28 stations

Noticeable events summary

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

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