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Denní bulletin o sluneční a geomagnetické aktivitě ze SIDC

Vydáno: 2017 Sep 17 1234 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
17 Sep 2017	070	007
18 Sep 2017	069	007
19 Sep 2017	068	007

Bulletin

The only sunspot group presently observed on the solar disk, Catania number 55 (NOAA AR 2680), is unlikely to produce flaring activity above the B-class level. No flares were reported in the past 24 hours. Newly arrived coronagraph observations show two very faint and slow partial halo CMEs (with angular width of about 180 degrees), first time observed in the SOHO/LASCO C2 field of view at 19:48 UT on September 15 and at 12:24 on September 16. The source region of both CMEs was the Catania sunspot group 46 (NOAA AR 2673) which is at the back side of the Sun as seen from the Earth. Therefore these two CMEs will not arrive to the Earth. The solar protons remained at background level in the past 24 hours.

The Earth remains to be inside the fast solar wind stream associated with a low-latitude extension of the northern polar coronal hole which reached central meridian on September 09. The solar wind speed is slowly decreasing and it presently amounts about 670 km/s. The interplanetary magnetic field magnitude is 6 nT. Due to the influence of the fast flow active geomagnetic conditions were reported in the last 24 hours (both NOAA and local station at Dourbes reported interval of Kp=4 and K=4, respectively). Presently geomagnetic conditions are quiet, however the solar wind speed is still quite high and longer intervals of southward Bz might induce unsettled to active conditions in the coming hours.

Dnešní odhadovaný mezinárodní počet slunečních skvrn (ISN): 015, na základě 21 stanic.

Solární indexy za 16 Sep 2017

Wolfovo číslo Catania	///
10cm sluneční tok	072
AK Chambon La Forêt	034
AK Wingst	025
Odhadovaný Ap	029
Odhadovaný mezinárodní počet slunečních skvrn	014 - Na základě 25 stanic

Souhrn významných událostí

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

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