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Denní bulletin o sluneční a geomagnetické aktivitě ze SIDC

Vydáno: 2025 May 01 1231 UTC

SIDC Předpověď

Sluneční erupce

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

Geomagnetismus

Minor storm expected (A>=30 or K=5)

Sluneční protony

Quiet

	10cm tok	Ap
01 May 2025	148	025
02 May 2025	148	032
03 May 2025	148	007

Slunečně aktivní oblasti a vzplanutí

Solar flaring activity was low over the past 24 hours, with only C-class flares detected. The total number of sunspot groups has also decreased, with only five currently visible on the solar disk. SIDC Sunspot Group 476 (NOAA Active Region 4065) has now rotated over the western limb, while SIDC Sunspot Groups 480 (NOAA 4068) and 485 (NOAA 4077) have shown signs of decay. The most active region is SIDC Sunspot Group 469 (NOAA Active Region 4079), currently located at N09E52. This region has a Beta magnetic configuration, showed signs of growth over the past 24 hours, and produced the largest flare of the period: a C2.5 flare (SIDC Flare 4255), which peaked on May 1 at 07:19 UTC. The remaining sunspot groups did not produce any flaring activity. Solar flaring activity is expected to remain low over the next 24 hours, with C-class flares very likely and only a small chance of M-class flares.

Vyhazování koronální hmoty

No Earth directed coronal mass ejections (CMEs) were observed in the available coronagraph imagery over the past 24 hours.

Koronální díra

SIDC Coronal Hole 99, a mid-latitude coronal hole with negative polarity, first reached the central meridian on April 29 and is now positioned on the western side of the Sun. The associated high-speed solar wind stream is currently arriving at Earth. Two small coronal holes reached the central meridian today, May 1: SIDC Coronal Hole 109, an equatorial coronal hole with negative polarity, and SIDC Coronal Hole 110, a high-latitude coronal hole also with negative polarity.

Solární bouře

The Earth remains under the influence of a slow solar wind, with speeds ranging between 400 and 490 km/s. The total interplanetary magnetic field (IMF) showed some enhancement and fluctuated throughout the period, reaching values up to 11.7 nT. The southward component of the IMF (Bz) was mainly positive on April 30, then turned negative on May 1, reaching a minimum of -9.8 nT. Around 01:00 UTC on May 1, the phi angle switched from positive to negative polarity. This transition is likely an early indicator of the arrival of the high-speed stream originating from the trans-equatorial coronal hole with negative polarity, the SIDC Coronal Hole 99, which crossed the central meridian on April 29. Solar wind speed is expected to increase later today and into tomorrow. The Earth is likely to come under the influence of this high-speed stream over the next few days.

Geomagnetismus

Geomagnetic conditions were quiet to unsettled until early May 1, around 00:00 UTC, when they reached active levels, with Kp-NOAA and K_BEL both peaking at 4. This increase in activity was driven by an enhanced interplanetary magnetic field (IMF) and the southward turning of its Bz component, which reached a minimum of -9.8 nT and remained negative for the extended period. With the expected arrival of a high-speed solar wind stream associated with SIDC Coronal Hole 99 (a large, elongated trans- equatorial coronal hole with negative polarity that crossed the central meridian on April 29), the geomagnetic conditions may intensify further. Minor storm to storm levels are possible later today and tomorrow, before gradually returning to unsettled conditions, with occasional active periods expected until the influence of the high-speed stream subsides.

Úrovně protonového toku

No enhancement or solar energetic particle event has been detected. The greater-than-10 MeV proton flux remained at low levels over the past 24 hours and is expected to stay below the event threshold in the next 24 hours.

Elektronové toky na geostacionární oběžné dráze

The greater-than-2 MeV electron flux measured by GOES 18 and GOES 19 remained below the threshold level over the past 24 hours. The flux is expected to remain below the threshold over the next 24 hours. The 24-hour electron fluence remained at normal levels and is anticipated to stay stable.

Dnešní odhadovaný mezinárodní počet slunečních skvrn (ISN): 070, na základě 19 stanic.

Solární indexy za 30 Apr 2025

Wolfovo číslo Catania	113
10cm sluneční tok	148
AK Chambon La Forêt	019
AK Wingst	012
Odhadovaný Ap	012
Odhadovaný mezinárodní počet slunečních skvrn	088 - Na základě 47 stanic

Souhrn významných událostí

Poskytuje Centrum pro analýzu dat o solárních vlivech© - SIDC - Zpracováno SpaceWeatherLive

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