查看星期五, 4 4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 Apr 04 1231 UTC

SIDC太陽影響數據分析中心的預報

太陽閃焰

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

地磁

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

太陽質子

Warning condition (activity levels expected to increase, but no numeric forecast given)

	10公分通量	Ap
04 Apr 2025	179	034
05 Apr 2025	177	024
06 Apr 2025	175	017

太陽活動區和耀斑

Solar flaring activity was low, with only low-level C-class flares recorded over the past 24 hours. There are currently seven numbered active regions visible on the solar disk. SIDC Sunspot Group 461 (NOAA Active Region 4048; beta-gamma), which is the most magnetically complex active regions on the disk but remained stable over the past 24 hours. SIDC Sunspot Group 455 (NOAA Active Region 4043; beta) is now approaching the west limb. Solar flaring activity is expected to be at low to moderate levels over the next 24 hours, with M-class flares likely and a small chance for X-class flares.

日冕物質拋射

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images.

太陽風

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) were slightly disturbed probably due to the arrival of a high-speed stream from a negative polarity coronal hole that began crossing the central meridian on April 1. The interplanetary magnetic field reached values of up to 14 nT, and the solar wind speed increased from values about 420 km/s to 540 km/s. The southward component of the interplanetary magnetic field fluctuated between -11 nT and 10 nT. The magnetic field orientation has switched orientation from the positive to the negative sector (directed towards the Sun). Solar wind conditions are expected to remain slightly elevated over the days with the ongoing high-speed stream influence.

地磁

Geomagnetic conditions over the past 24 hours reached minor storm levels between 18:00 UTC and 00:00 UTC on April 3, both globally and locally over Belgium (NOAA Kp: 5-; K-Bel: 5). Active conditions are expected over the next day, with a possible isolated minor storm period in response to the arrival of the high-speed stream.

質子通量水平

Over the past 24 hours the greater than 10 MeV GOES proton flux was slightly elevated, remaining well below radiation storm levels. The proton flux is expected to gradually return to nominal levels over the next few days, with a chance of exceeding minor storm levels if any high-energy flares or eruptions occur.

地球靜止軌道上的電子通量

The greater than 2 MeV electron flux, as measured by GOES-18, was below the 1000 pfu threshold and is expected to remain so over the next 24 hours. The 24-hour electron fluence was at normal to moderate levels and is expected to remain at normal levels over the next 24 hours.

今日估計的國際太陽黑子數（ISN）：185，基於22個觀測站。

太陽活動指數 03 Apr 2025

卡塔尼亞沃爾夫數	181
10厘米太陽通量	178
AK Chambon La Forêt	043
AK Wingst	023
估計地磁Ap指數	025
估計國際太陽黑子數	157 - 基於30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

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