Viewing archive of Wednesday, 15 April 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2020 Apr 15 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
15 Apr 2020	070	008
16 Apr 2020	070	009
17 Apr 2020	070	009

Bulletin

There were no sunspot groups visible on the solar disk. Solar activity was at very low levels and is expected to remain so.

The greater than 10 MeV proton flux and the greater than 2 MeV electron flux were at nominal values and are expected to remain so.

STEREO-A and SOHO observed a coronal mass ejection (CME) at both their respective east and west limb starting simultaneously during the afternoon of 14 April. These concerned very slow moving CMEs with a plane-of-the-sky speed around 200 km/s, with no obvious solar disk signature. Standing-by further coronagraphic imagery to determine any earth-directed component.

Solar wind speed undulated between 380 and 450 km/s ending the period near 415 km/s (DSCOVR). Bz varied between -4 and +3 nT, however with a mostly negative stretch between 20 and 05UT. The direction of the interplanetary magnetic field (phi angle) was mostly variable, but ended the period in a predominantly sunward orientation (negative sector).

Geomagnetic activity was at quiet to unsettled levels and is expected to remain so during the next few days.

Today's estimated international sunspot number (ISN): 000, based on 30 stations.

Solar indices for 14 Apr 2020

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	014
AK Wingst	008
Estimated Ap	009
Estimated international sunspot number	000 - Based on 33 stations

Noticeable events summary

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

All times in UTC

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