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Denní bulletin o sluneční a geomagnetické aktivitě ze SIDC

Vydáno: 2021 Jun 20 1241 UTC

SIDC Předpověď

Sluneční erupce

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

Geomagnetismus

Quiet (A<20 and K<4)

Sluneční protony

Quiet

	10cm tok	Ap
20 Jun 2021	077	003
21 Jun 2021	077	004
22 Jun 2021	077	003

Bulletin

Solar activity remained at very low levels in the last 24 hours. The new active region NOAA AR2834 has now rotated behind the west limb. Active region NOAA AR2833 (Catania sunspot group 7) has remained stable and is now characterised as type beta. The flaring activity is expected to remain at very low levels for the next 24 hours with a minor chance for a C-class flare.

No Earth-directed coronal mass ejections (CMEs) were detected in the available coronagraph imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours and is expected to remain so in the next 24 hours. The greater than 2MeV electron flux was above the 1000 pfu threshold over the entire period and is expected to remain elevated over the next 24 hours. The 24h electron fluence was at moderate levels and is expected to be at moderate to nominal levels for the next 24 hours.

Over the past 24h the solar wind data (ACE and DSCOVR) continued to slowly return to background slow solar wind conditions. The solar wind speed ranged between to 412 km/s and 515 km/s. The total magnetic field remained undisturbed with a maximum value of 4.1 nT with a very weak Bz down to -2.3 nT. The orientation of the interplanetary magnetic field remained in the negative sector.

The geomagnetic conditions over the past 24 hours were globally quiet. Quiet geomagnetic conditions are expected for the next 24 hours. Isolated unsettled periods remain possible. A patchy extension of the northern solar positive polarity coronal hole and a very small positive polarity coronal hole in the southern hemisphere have crossed the central meridian over the past 24 hours and might become geo-effective, possibly leading to unsettled geomagnetic conditions during the night of June 23rd.

Dnešní odhadovaný mezinárodní počet slunečních skvrn (ISN): 014, na základě 16 stanic.

Solární indexy za 19 Jun 2021

Wolfovo číslo Catania	///
10cm sluneční tok	077
AK Chambon La Forêt	008
AK Wingst	004
Odhadovaný Ap	003
Odhadovaný mezinárodní počet slunečních skvrn	014 - Na základě 22 stanic

Souhrn významných událostí

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