Перегляд архіву середа, 29 квітня 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2020 Apr 29 1231 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
29 Apr 2020	069	006
30 Apr 2020	069	007
01 May 2020	069	009

Bulletin

Solar X-ray flux remained below B level. Active Regions (ARs) 2760 and 2761 decayed and not shown any significant flaring activity. Another small bipolar region with an associated sunspot, located around N22W38 has also emerged on Apr 29. Solar flaring activity is expected to remain at very low levels.

No Earth directed Coronal Mass Ejections (CMEs) were observed in the available coronagraphic imagery in the last 24 hours.

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 to moderate levels over the next 24 hours.

The solar wind speed near Earth decreased from around 430 km/s to 350 km/s and the total magnetic field varied between 1 and 6 nT (DSCOVR) over the past 24 hours. The Interplanetary Magnetic Field (IMF) was predominantly oriented towards the Sun (phi angle in the negative sector), with an extended deviation into the positive sector between 12 and 18 UT on Apr 28. Bz was mostly negative, with a minimum value of around -3 nT. Nominal solar wind conditions are expected for Apr 29 - May 01. The filament eruption observed on April 27 that possibly had an Earth directed component may be seen at Earth on May 02.

Geomagnetic conditions were quiet (local K Dourbes and NOAA Kp recorded values between 0-2). Quiet geomagnetic conditions are expected for Apr 29 - May 01 with isolated unsettled episodes possible due the patchy positive coronal hole that began to traverse the central meridian on Apr 26.

Today's estimated international sunspot number (ISN): 024, based on 15 stations.

Solar indices for 28 Apr 2020

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	008
AK Wingst	007
Estimated Ap	006
Estimated international sunspot number	011 - Based on 20 stations

Noticeable events summary

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

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