Viewing archive of Sunday, 30 July 2023

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2023 Jul 30 1231 UTC

SIDC Forecast

Solar flares

M-class flares expected (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Proton event in progress (>10 MeV)

	10cm flux	Ap
30 Jul 2023	177	005
31 Jul 2023	179	004
01 Aug 2023	178	019

Solar Active Regions and flaring

Solar flaring activity was moderate during the last 24 hours, with two M1 flares produced by NOAA Active Region (AR) 3380 (magnetic type Beta, Catania group 95) yesterday 16:24 UTC and by NOAA AR 3390 (magnetic type Beta) today 08:22 UTC. C-class flares brighter than C4 were also produced in the last 24 hours: a C6 and a C5 by NOAA AR 3379 (magnetic type Alpha, Catania group 91) and a C5 by NOAA AR 3380. For the next 24 hours isolated M-class flares are very likely, with a small chance of an X-flare.

Coronal mass ejections

No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours.

Solar wind

The Solar Wind (SW) conditions resemble the slow SW regime. The SW speed gradually increased from 360 km/s to about 540 km/s in the last 24 hours. The total interplanetary magnetic field (Bt) varied between 2 and 9 nT and its North-South component (Bz) ranged between -7 and 9 nT. The interplanetary magnetic field phi angle was directed predominantly away from the Sun during the past 24 hours. The SW conditions are expected to remain at similar levels in the next 24 hours.

Geomagnetism

Geomagnetic conditions were globally and locally at quiet to unsettled levels (NOAA Kp and K BEL 1 to 3) during the past 24 hours. They are expected to remain at the same levels both locally and globally in the next 24 hours.

Proton flux levels

The greater than 10 MeV proton flux dropped below the 100 pfu threshold level yesterday at 12:05 UTC. However, it remains above the the 10 pfu threshold and it is expected to stay above this level for the next several hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by the GOES-16 satellite, exceeded momentarily the 1000 pfu alert level yesterday at 14:45 UTC and remain close to this limit until about 19:15 UTC. For the next 24 hours, it is expected to increase again but remain below the threshold level. The 24h electron fluence is increased but remains at nominal levels and is expected to remain so during the next 24 hours.

Today's estimated international sunspot number (ISN): 180, based on 17 stations.

Solar indices for 29 Jul 2023

Wolf number Catania	///
10cm solar flux	179
AK Chambon La Forêt	018
AK Wingst	013
Estimated Ap	012
Estimated international sunspot number	180 - Based on 25 stations

Noticeable events summary

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

All times in UTC

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