Het archief bekijken van vrijdag 28 juli 2017

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2017 Jul 28 1230 UTC

SIDC Prognose

Zonnevlammen

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

Geomagnetisme

Quiet (A<20 and K<4)

Proton Flux monitor

Quiet

	10cm flux	Ap
28 Jul 2017	069	007
29 Jul 2017	069	003
30 Jul 2017	072	008

Bulletin

Solar activity was at very low levels, and is expected to remain so. A barely visible sunspot group (Catania 40) is trying to develop at location N19W01. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux remained slightly above background levels.

A partial halo CME was detected by CACTus on 28/05:36UT July emanating from behind the northeast limb with a plane-of-the-sky speed near 600 km/s. The source is old active region NOAA 2665 which is currently on the Sun's farside and expected to round the east limb on 31 July. The CME is not directed to Earth, but STEREO-A is likely to be impacted.

Solar wind speed varied steadily between 430-450 km/s until 06UT, when it shifted up to a range between 450 and 490 km/s (DSCOVR). Bz oscillated between -6 and +5 nT during the entire period. The interplanetary magnetic field was mostly directed away from the Sun. A small negative equatorial coronal hole (CH) is transiting the central meridian.

The geomagnetic field was at quiet to unsettled levels, and is expected to remain so. The particle stream associated with the aforementioned CH may start influencing the earth environment late on 30 or on 31 July, with active geomagnetic conditions possible.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 000, gebaseerd op 15 stations.

Zon indexen voor 27 Jul 2017

Wolfgetal Catania	000
10cm zonneflux	068
AK Chambon La Forêt	012
AK Wingst	008
Geschatte Ap	007
Geschat internationaal zonnevlekkengetal	000 - Gebaseerd op 25 stations

Overzicht opvallende gebeurtenissen

Aangeboden door het Solar Influences Data Analysis Center© - SIDC - Verwerkt door SpaceWeatherLive

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