Viewing archive of Saturday, 29 June 2024

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2024 Jun 29 1231 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
29 Jun 2024	180	017
30 Jun 2024	182	024
01 Jul 2024	184	024

Solar Active Regions and flaring

Solar flaring activity was at low levels, with a few C-class flares recorded in the past 24 hours. The largest flare of the period was a C3.2 flare, peaking at 14:40 UTC on June 28, associated with an active region (AR) behind the east limb (N10E89), which is currently rotating onto the disk. NOAA AR 3723 (beta class), which produced only one low-level C-class flare in the last 24 hours, appears to be shrinking and reducing in complexity. Other regions on the disk have simple configurations of their photospheric magnetic fields (alpha and beta) and did not show any significant flaring activity. Solar flaring activity is expected to be at low to moderate levels over the next 24 hours, with C-class flares probable and a chance of M-class flares.

Coronal mass ejections

A faint partial halo coronal mass ejection (CME) was observed in SOHO/LASCO-C2 at around 00:48 UTC on June 28, directed towards the southeast from Earth's perspective. This CME is likely associated with flaring near NOAA AR 3730. Given the source's location close to the disk center, an impact at Earth is possible from late on July 1st. This ICME will likely interact with the one from June 27 on its way to Earth, although the prediction of its arrival remains with low confidence. No other Earth-directed CMEs have been detected in the available coronagraph imagery over the past 24 hours.

Solar wind

Over the past 24 hours, the solar wind parameters (ACE and DSCOVR) reflected ongoing ICME influences. The total interplanetary magnetic field strength increased at the start of the period, reaching a maximum value of 24 nT, before gradually decreasing and stabilizing around 9 nT. The solar wind speed ranged between 420 km/s and 490 km/s. The southward component of the interplanetary magnetic field reached a minimum value of -16 nT. Solar wind conditions are expected to remain slightly elevated due to the ICME passage, with a chance of a weak enhancement on June 29 and July 1 due to the possible arrival of CMEs from June 25 and June 27-28, although with low confidence.

Geomagnetism

The geomagnetic conditions over the past 24 hours reached severe storm levels globally (NOAA Kp 8-) between 12:00 and 15:00 UTC on June 28 due to the ICME arrival. Locally, moderate storm conditions were observed over Belgium (K-Bel = 6) between 12:00 and 18:00 UTC on June 28. Mostly quiet to unsettled geomagnetic conditions are expected for the next 24 hours, with a chance of isolated active or minor storm periods due to ongoing CME influence and a small chance of an CME arrival from June 25.

Proton flux levels

Over the past 24 hours, the greater than 10 MeV GOES proton flux was at nominal levels and is expected to remain so for the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by the GOES-16 satellite, remained below the 1000 pfu threshold. It is expected to remain below the threshold during the next 24 hours. The 24 hour electron fluence was at normal levels and is expected to remain at these levels for the following 24 hours.

Today's estimated international sunspot number (ISN): 209, based on 16 stations.

Solar indices for 28 Jun 2024

Wolf number Catania	///
10cm solar flux	181
AK Chambon La Forêt	062
AK Wingst	061
Estimated Ap	063
Estimated international sunspot number	168 - 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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