查看星期日, 12 10月 2025歷史檔案

SIDC 太陽影響數據分析中心的每日公告

發布時間: 2025 Oct 12 1231 UTC

SIDC太陽影響數據分析中心的預報

太陽閃焰

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

地磁

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

太陽質子

Quiet

	10公分通量	Ap
12 Oct 2025	131	022
13 Oct 2025	135	024
14 Oct 2025	140	019

太陽活動區和耀斑

Solar flaring activity was low over the past 24 hours, with five C-class flares identified. SIDC flare 5714 was the brightest of all, a C2 that peaked on 11 Oct at 19:15 UTC. It is associated with SIDC Sunspot Group 666 (NOAA Active Region [AR] 4247, Beta magnetic configuration). Three of the flares were produced by SIDC Sunspot Group 639 (NOAA AR 4246, Beta magnetic configuration) and the last flare from SIDC Sunspot Group 621 (NOAA AR 4248 and 4250, Beta magnetic configuration). More C-class flaring activity is expected in the next 24 hours, from any of SIDC Sunspot Groups 639, 666, and 621. There is also a small chance for an M-class flare from SIDC Sunspot Group 621.

日冕物質拋射

No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours. A CME seen in LASCO-C2 images as launched on 11 Oct at 18:48 UTC is a back-sided event and not expected to reach Earth.

太陽風

The Solar Wind (SW) conditions are affected by a High Speed Stream (HSS) arrival on 11 Oct at around 21:30 UTC. It is associated with the SIDC Coronal Hole 116 crossing of the solar central meridian on 8 Oct. However, by that time the effects of the glancing blow associated with SIDC CME 578 had already subsided hence the two events did not coincide. As a result of the HSS arrival, the SW speed reached 800 km/s on 12 Oct at around 05:30 UTC and remains above 700 km/s since. The interplanetary magnetic field (B) peaked at 17 nT on 11 Oct 18:45 UTC, while still under the influence of the glancing blow, and have now dropped to around 5 nT. The B's North-South component (Bz) fluctuated between -10 and 10 nT while still affected by the glancing blow and now ranges between -5 and 5 nT. The presents of the HSS is expected to continue in the next 24 hours.

地磁

During the last 24 hours geomagnetic conditions were globally quiet to active (NOAA Kp 2+ to 4) and locally quiet to unsettled (K BEL 2 to 3). These were rather modest conditions considering the arrival of a High Speed Stream (HSS) late on 11 Oct. However, it can be explained by the relatively low interplanetary magnetic field and more importantly from the absence of a strong negative North-South interplanetary magnetic field component (Bz). In the next 24 hours the geomagnetic conditions are expected to be at active levels both globally and locally, however there is a change that minor storm levels might occur if there is a decrease in Bz.

質子通量水平

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at background levels over the past 24 hours and is likely to remain so in the next 24 hours.

地球靜止軌道上的電子通量

The greater than 2 MeV electron flux as measured by GOES 19 was above the 1000 pfu alert threshold on 11 Oct between 12:50 and 20:00 UTC, with a peak value at 2800 pfu, but has dropped below the alert level since. In the next 24 hours it is expected to remain below the alert threshold. The 24-hour electron fluence was at moderate levels during the past 24 hours. It is expected to drop to normal levels within the next 24 hours.

今日估計的國際太陽黑子數（ISN）：127，基於09個觀測站。

太陽活動指數 11 Oct 2025

卡塔尼亞沃爾夫數	///
10厘米太陽通量	131
AK Chambon La Forêt	029
AK Wingst	018
估計地磁Ap指數	018
估計國際太陽黑子數	099 - 基於12個觀測站

顯著活動摘要

由太陽影響數據分析中心提供© - SIDC - 由 SpaceWeatherLive處理

所有時間均採用 UTC 時間

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