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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2019 Mar 10 1230 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10cm flux	Ap
10 Mar 2019	070	006
11 Mar 2019	070	008
12 Mar 2019	070	015

Bulletin

The solar activity has been mostly quiet over the past 24 hours. The unique sunspot group on the disc (Catania sunspot group 9, NOAA Active Region 2734) continued to decay, nevertheless produced a B6.1-class flare following by a coronal dimming on March 9 at 12:26 UT. The X-ray flux remained below B-level, and the solar activity is expected to remain at low levels.

A very fainted (halo) Coronal Mass Ejection (CME) associated with the B6.1-class flare was observed in SOHO/LASCO-C2 images at 15:12 UT and in STEREO-COR2 around 15:00 UT, but has not been captured by the CACTUS detection tool. According to the STEREO-COR2 observations, the CME speed is relatively slow and would be around 200 km/s and 250 km/s. The CME is expected to reach Earth in about 4 days (March 14), but the impact might not be visible due to the fact that it is a very fainted and slow CME.

The solar wind parameters continued to be slightly enhanced during the last 24 hours due to several small patchy equatorial coronal holes observed on the solar disc last week. The solar wind speed ranged between 400 km/s and 450 km/s. The total interplanetary magnetic field strength remained below 6 nT. The Bz component fluctuated between -5 nT and 5 nT. The slightly enhanced solar wind parameters are expected to persist for more days, due to all those small patchy equatorial coronal holes on the surface of the sun. Rather small and short disturbances of the solar wind parameters are also anticipated due to the expected arrival of the ICME on March 12, which was associated with the C1.3-class flare on March 8. Moreover, a large returning trans-equatorial extension of the southern polar coronal hole is now reaching the central meridian. The increase of the solar wind speed associated with this coronal hole is expected to come next week on March 13 midday.

The geomagnetic conditions were quiet over the past 24 hours, with K-index (Dourbes) ranging from 0 and 2, and Kp (NOAA) ranging from 1 and 2. The geomagnetic conditions are expected to be mainly quiet, but in response to the slightly enhanced interplanetary magnetic field and possible prolonged period of southward directed Bz component, sort period of unsettled conditions may also occur.

Today's estimated international sunspot number (ISN): 011, based on 16 stations.

Solar indices for 09 Mar 2019

Wolf number Catania	///
10cm solar flux	071
AK Chambon La Forêt	010
AK Wingst	007
Estimated Ap	005
Estimated international sunspot number	011 - Based on 22 stations

Noticeable events summary

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

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