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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 Sep 30 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
30 Sep 2018	069	007
01 Oct 2018	069	010
02 Oct 2018	069	007

Bulletin

Solar activity was very low with X-ray flux remaining below B level. A new bipolar active region (NOAA 2723) emerged but is inactive. Chances for X-ray flaring are thus increasing but X-ray flux is still expected to be below C level.

No Earth directed CMEs have been recorded in coronagraph images.

Proton flux levels were at background values and are expected to remain so.

A negative polarity equatorial coronal hole is currently transiting the central meridian and is expected to become geoeffective by late October 3.

Solar wind saw some transient perturbations with solar wind speed reaching 500 km/s and total magnetic field reaching 8nT. Bz was mostly positive. Currently, Solar wind speed is back at near 430 km/s and total magnetic field at a nominal 2-4nT. Near nominal solar wind conditions are expected over the next days.

Geomagnetic conditions were quiet to unsettled (both NOAA Kp and local K Dourbes 0-3). Geomagnetic conditions are expected to be quiet to unsettled over the next days.

Today's estimated international sunspot number (ISN): 016, based on 22 stations.

Solar indices for 29 Sep 2018

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	016
AK Wingst	012
Estimated Ap	012
Estimated international sunspot number	000 - Based on 29 stations

Noticeable events summary

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

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