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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2019 Mar 20 1230 UTC

SIDC Forecast

Сонячні спалахи

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10cm flux	Ap
20 Mar 2019	071	004
21 Mar 2019	073	007
22 Mar 2019	075	007

Bulletin

There is an unnumbered active region to the northwest of AR 2735 that developed quickly in the last hours. It produced a C4.8 flare peaking at 11:18 UT and several B-class flares. A small dimming was also visible in relation to these flares, there are no coronagraph data yet to search for an associated CME. This will be confirmed later as the data become available. There is one numbered active region visible on the solar disk (NOAA AR 2735 with beta magnetic field configuration). This region has grown in size and number of sunspots. A small dimming was seen from this AR on 18 March at 14:27 UT, for which no obvious CME could be found in the data. More C-class flares can be expected, M-class flares are possible.

Solar protons have remained at background levels over the past 24 hours.

The solar wind speed did not reach high values (lower than 420 km/s) in the high speed stream that was expected for yesterday, the interplanetary magnetic field remained below 8 nT. Therefore, geomagnetic conditions reached only unsettled levels (K = 3). At present, the solar wind speed is at 400 km/s with interplanetary magnetic fields of 4 nT. Quiet to unsettled conditions can be expected in the coming hours.

Today's estimated international sunspot number (ISN): 038, based on 17 stations.

Solar indices for 19 Mar 2019

Wolf number Catania	017
10cm solar flux	070
AK Chambon La Forêt	016
AK Wingst	010
Estimated Ap	009
Estimated international sunspot number	016 - Based on 27 stations

Noticeable events summary

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

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