Viewing archive of Monday, 11 March 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Mar 11 1250 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
11 Mar 2019	071	007
12 Mar 2019	071	035
13 Mar 2019	071	013

Bulletin

The only region on disk: Catania group 9 (NOAA region 2734) was quiet and seems to be in decay. Overall probability for flaring at C level remains low.

No new CME's have been detected in coronagraph data.

The Solar proton flux levels were at background values and expected to remain so.

An equatorial negative polarity coronal hole has passed the central meridian overnight, with it's fast speed stream expected to become geo- effective from midnight March 13/14.

Solar wind conditions mainly continued to be in decay with solar wind speed decreasing from around 400 km/s to currently around 350 km/s. Total magnetic field was at a nominal 5-6nT with a varying Bz. The phi angle was in the negative sector until around 15:40UT when it switched into the positive sector. Solar wind conditions are expected to become enhanced with the arrival of the March 8 CME by noon tomorrow March 12. Given the slow speed of the CME, it's effects on the solar wind conditions may well remain limited though.

Geomagnetic conditions were quiet (both NOAA Kp and local K Dourbes 0-2) but may become enhanced with the expected CME arrival. Active conditions must thus be anticipated with a possibility of minor geomagnetic storms occurring.

Today's estimated international sunspot number (ISN): 012, based on 21 stations.

Solar indices for 10 Mar 2019

Wolf number Catania	///
10cm solar flux	071
AK Chambon La Forêt	004
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	011 - Based on 22 stations

Noticeable events summary

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

All times in UTC

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