Viewing archive of Thursday, 1 July 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2021 Jul 01 1254 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
01 Jul 2021	095	018
02 Jul 2021	095	021
03 Jul 2021	093	019

Bulletin

Two C flares were observed from NOAA region 2835, of which a C3.6 flare peaking at 18:15UT. NOAA region 2835 continued to grow and continues to show mixed polarity in the intermediate spots and the leading part. It is classified as beta- gamma-delta magnetic configuration. Bipolar region NOAA 2836 and unipolar region NOAA 2837 are both in decay. Flaring at C level is likely (mostly from NOAA 2835) over the next 24 hours, with also a chance for a possible M flare.

No new Earth directed CMEs have been recorded in coronagraph data.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux was below the 1000 pfu event threshold. The 24h electron fluence was at normal levels and electron fluence is expected to initially remain at normal levels during the next days, but may then start rising if enhanced solar wind conditions persist.

Solar wind conditions displayed the expected increase in Solar wind speed due to the forecasted high speed stream. Solar wind speed reached 520km/s by 21UT and has been around 500km/s since then. The magnetic field remained elevated and reached peaks over 13nT with also Bz seeing periods of consistently negative values down to -10nT, though Bz has been positive more recently since 1UT. The persistent increased magnetic field and the variations in magnetic field orientation seem to indicate that the high speed stream is carrying some transients along. This is possibly allready the June 27 CME that was expected later today. Solar wind conditions are expected to remain enhanced as the transients are passing. Later, on July 3, there is again a possible CME arrival from the June 29 CME.

Geomagnetic conditions were quiet to active (local K Dourbes 2-4 and NOAA Kp 1-4). Geomagnetic conditions are expected to be unsettled with isolated active periods possible.

Today's estimated international sunspot number (ISN): 053, based on 18 stations.

Solar indices for 30 Jun 2021

Wolf number Catania	///
10cm solar flux	094
AK Chambon La Forêt	025
AK Wingst	017
Estimated Ap	016
Estimated international sunspot number	056 - Based on 30 stations

Noticeable events summary

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

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