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Denní bulletin o sluneční a geomagnetické aktivitě ze SIDC

Vydáno: 2019 Apr 21 1230 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
21 Apr 2019	069	004
22 Apr 2019	069	003
23 Apr 2019	068	006

Bulletin

Solar activity was at very low levels. Small active region NOAA 2739 decayed further and is expected to become spotless later today. CACTus revealed a coronal mass ejection (CME) from the west limb starting around 05:00UT in LASCO/C2 coronagraphic images. This CME was most likely associated with eruptive processes in NOAA 2738 from behind the west limb, as evident from SDO EUV imagery. None of the observed CMEs had an earth- directed component. The greater than 10 MeV proton flux was at nominal values. An equatorial negative polarity coronal hole (CH) is transiting the central meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed was fairly steady between mostly 320 and 350 km/s (DSCOVR). Bz varied between -5 and +4 nT. The interplanetary magnetic field was predominantly directed away from the Sun (positive sector). Geomagnetic conditions were at quiet levels, with an isolated unsettled interval (06-09UT) recorded at Dourbes.

Mostly quiet geomagnetic conditions are expected, with a chance on an isolated unsettled episode. Late on 23 or on 24 April, geomagnetic activity is expected to increase following the arrival of the wind stream from an equatorial negative polarity coronal hole.

Dnešní odhadovaný mezinárodní počet slunečních skvrn (ISN): 007, na základě 25 stanic.

Solární indexy za 20 Apr 2019

Wolfovo číslo Catania	///
10cm sluneční tok	070
AK Chambon La Forêt	008
AK Wingst	///
Odhadovaný Ap	005
Odhadovaný mezinárodní počet slunečních skvrn	012 - Na základě 31 stanic

Souhrn významných událostí

Poskytuje Centrum pro analýzu dat o solárních vlivech© - SIDC - Zpracováno SpaceWeatherLive

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