Viewing archive of Thursday, 21 March 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Mar 21 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
21 Mar 2019	077	004
22 Mar 2019	078	007
23 Mar 2019	081	007

Bulletin

There are two active regions on the visible solar disc. NOAA AR 2735 is decaying and has produced no activity in the past hours. On the other hand, the newly numbered NOAA AR 2736 (beta magnetic field configuration) has been more active producing numerous B-class flares and two C-class flares, the largest wass a C5.6 one peaking at 03:12 UT. This AR produced a faint CME yesterday directed mostly to the west, first seen at 18:24 UT on LASCO-C2, this CME is not expected to affect the Earth. Nevertheless, it had produced a larger CME earlier on March 20, first seen at 12:00 UT as an asymmetric full halo CME with the bulk of the material going to the northwest. Using LASCO-C2 and COR2 (beacon) images the speed of this CME was calculated to be 751 km/s, a flank of the CME is expected to hit the Earth on March 23.

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

The solar wind speed is at 350 km/s with interplanetary magnetic fields of 4 nT. Quiet conditions were observed in the past hours and the situation is not expected to change until the CME arrival on March 23.

Today's estimated international sunspot number (ISN): 040, based on 18 stations.

Solar indices for 20 Mar 2019

Wolf number Catania	///
10cm solar flux	077
AK Chambon La Forêt	009
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	036 - 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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