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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Feb 08 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Protoni solari

Quiet

	10cm flux	Ap
08 Feb 2019	070	020
09 Feb 2019	070	019
10 Feb 2019	070	007

Bulletin

The solar activity has been quiet over the past 24 hours. The visible solar disc was spotless, and the X-ray flux remained below B-level. Flaring conditions is expected to remain at low levels.

No Earth directed coronal mass ejection has been observed. The greater than 10 MeV solar protons flux remained at nominal levels over the past 24 hours and is expected to remain so.

The solar wind speed reached a minimum (350 km/s) on Feb 8 around 04:00 UT, it then increased to about 475 km/s. The total interplanetary magnetic field strength remained below 6.5 nT during the 24-hour period, and the southward magnetic component fluctuated between -5.5 and 4.5 nT. This increase of the wind speed happened simultaneously with the sector boundary change from negative to positive polarity. It is probably due to the expected coming high-speed stream that pushes heads the current measured wind stream. A new sector boundary change from positive to negative polarity is expected later today with the arrival of the high-speed stream associated with the large patchy coronal hole (of negative polarity) that reached the central meridian on Feb 4.

The geomagnetic conditions were quiet with several periods of unsettled activity. The Kp index ranged between 0-2 (NOAA) and the local K index 0-3 (Dourbes). The conditions are expected to remain mostly quiet with possible unsettled conditions periods for the next couples of hours, then active conditions with possible short periods of minor storm is expected with the arrival of the high-speed stream associated with the coronal hole that reached the central meridian on Feb 4.

Today's estimated international sunspot number (ISN): 000, based on 11 stations.

Solar indices for 07 Feb 2019

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	010
AK Wingst	006
Estimated Ap	004
Estimated international sunspot number	000 - Based on 26 stations

Noticeable events summary

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

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