Viewing archive of Tuesday, 4 August 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2020 Aug 04 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
04 Aug 2020	073	015
05 Aug 2020	073	009
06 Aug 2020	073	010

Bulletin

There are presently three numbered active regions observed on the visible side of the solar disc, NOAA AR 2768, 2769 and 2770. As all the active regions have simple, Alpha configuration of their photospheric magnetic field, and they did not produce any C-class or even B-class flares during last 24 hours. Nevertheless, the B-class and isolated C-class flares are still possible, although not very probable, in the coming hours. During last 24 hours there were no Earth directed CMEs and the solar protons remained at the background level.

Earth is still inside the fast solar wind. During last 24 hours the wind speed was fluctuating between 630 and 735 km/s, and its present value is 660 km/s. The interplanetary magnetic field magnitude is about 3 nT. As expected, the high solar wind speed together with the longer interval of negative value of the Bz component of interplanetary magnetic field induced active geomagnetic conditions. Local station at Dourbes reported K=4 around midnight and NOAA reported Kp=4 at around 6 UT this morning. As the solar wind speed is still high, we expect unsettled to possibly active geomagnetic conditions in the coming hours.

Today's estimated international sunspot number (ISN): 011, based on 24 stations.

Solar indices for 03 Aug 2020

Wolf number Catania	///
10cm solar flux	073
AK Chambon La Forêt	026
AK Wingst	022
Estimated Ap	023
Estimated international sunspot number	011 - Based on 31 stations

Noticeable events summary

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

All times in UTC

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